From 952a2def4ce9ad96cef9216a36690b9697b4410d Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Mon, 8 Sep 2025 08:14:59 -0700
Subject: [PATCH 01/16] Fix incorrect retrieval of activate_environment

---
 action.yml   | 2 +-
 src/conda.ts | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/action.yml b/action.yml
index 280bd608..99578d64 100644
--- a/action.yml
+++ b/action.yml
@@ -139,7 +139,7 @@ inputs:
       'Conda configuration. If you’d prefer that conda’s base environment not be
       activated on startup, set the to "false". Default is "true". This setting
       always overrides if set to "true" or "false". If you want to use the
-      "condarc-file" setting pass and empty string. See
+      "condarc-file" setting pass an empty string. See
       https://docs.conda.io/projects/conda/en/latest/user-guide/configuration/
       for more information.'
     required: false
diff --git a/src/conda.ts b/src/conda.ts
index 340d1c93..b6f887f3 100644
--- a/src/conda.ts
+++ b/src/conda.ts
@@ -308,8 +308,8 @@ export async function condaInit(
   let ownPath: string;
   const isValidActivate = !utils.isBaseEnv(inputs.activateEnvironment);
   const autoActivateBase: boolean =
-    options.condaConfig["auto_activate_base"] === "true" ||
-    options.condaConfig["activate_environment"] === "base";
+    options.condaConfig.auto_activate_base === "true" ||
+    inputs.activateEnvironment === "base";
 
   // Fix ownership of folders
   if (options.useBundled) {

From 15aa7c6964a177a589a4d015db0a09f33698db57 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 09:40:52 -0700
Subject: [PATCH 02/16] Replace auto-activate-base with auto-activate

---
 .github/workflows/example-3.yml |  4 ++--
 action.yml                      | 20 +++++++++++++++-----
 src/conda.ts                    | 16 ++++------------
 src/input.ts                    | 12 ++++++++++--
 src/types.ts                    |  2 +-
 5 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/.github/workflows/example-3.yml b/.github/workflows/example-3.yml
index c113cfd1..915373f6 100644
--- a/.github/workflows/example-3.yml
+++ b/.github/workflows/example-3.yml
@@ -38,7 +38,7 @@ jobs:
           environment-file: etc/example-environment.yml
           python-version: 3.8
           condarc-file: etc/example-condarc.yml
-          auto-activate-base: false
+          auto-activate: false
           auto-update-conda: true
       - run: |
           conda info
@@ -60,7 +60,7 @@ jobs:
           environment-file: etc/example-environment-no-name.yml
           python-version: 3.8
           condarc-file: etc/example-condarc.yml
-          auto-activate-base: false
+          auto-activate: false
           auto-update-conda: true
       - run: |
           conda info
diff --git a/action.yml b/action.yml
index 99578d64..8d93d869 100644
--- a/action.yml
+++ b/action.yml
@@ -134,16 +134,26 @@ inputs:
       for more information.'
     required: false
     default: ""
-  auto-activate-base:
+  auto-activate:
     description:
-      'Conda configuration. If you’d prefer that conda’s base environment not be
-      activated on startup, set the to "false". Default is "true". This setting
-      always overrides if set to "true" or "false". If you want to use the
-      "condarc-file" setting pass an empty string. See
+      'Conda configuration. If you’d prefer that conda’s default environment not
+      be activated on startup, set the to "false". Default is "true". This
+      setting always overrides if set to "true" or "false". If you want to use
+      the "condarc-file" setting pass an empty string. See
       https://docs.conda.io/projects/conda/en/latest/user-guide/configuration/
       for more information.'
     required: false
     default: "true"
+  auto-activate-base:
+    description:
+      (deprecated) 'Conda configuration. If you’d prefer that conda’s base
+      environment not be activated on startup, set the to "false". Default is
+      "true". This setting always overrides if set to "true" or "false". If you
+      want to use the "condarc-file" setting pass an empty string. See
+      https://docs.conda.io/projects/conda/en/latest/user-guide/configuration/
+      for more information.'
+    required: false
+    default: "legacy-placeholder"
   auto-update-conda:
     description:
       'Conda configuration. When "true", conda updates itself any time a user
diff --git a/src/conda.ts b/src/conda.ts
index b6f887f3..e5512cbc 100644
--- a/src/conda.ts
+++ b/src/conda.ts
@@ -241,31 +241,23 @@ export async function applyCondaConfiguration(
     );
   }
   // auto_activate_base was renamed to auto_activate in 25.5.0
-  core.info(`auto_activate: ${inputs.condaConfig.auto_activate_base}`);
+  core.info(`auto_activate: ${inputs.condaConfig.auto_activate}`);
   try {
     // 25.5.0+
     await condaCommand(
-      [
-        "config",
-        "--set",
-        "auto_activate",
-        inputs.condaConfig.auto_activate_base,
-      ],
+      ["config", "--set", "auto_activate", inputs.condaConfig.auto_activate],
       inputs,
       options,
     );
   } catch (err) {
     try {
       // <25.5.0
-      core.warning(
-        "Using auto_activate_base is deprecated, please use auto_activate instead",
-      );
       await condaCommand(
         [
           "config",
           "--set",
           "auto_activate_base",
-          inputs.condaConfig.auto_activate_base,
+          inputs.condaConfig.auto_activate,
         ],
         inputs,
         options,
@@ -281,7 +273,7 @@ export async function applyCondaConfiguration(
       value.trim().length === 0 ||
       key === "channels" ||
       key === "pkgs_dirs" ||
-      key === "auto_activate_base"
+      key === "auto_activate"
     ) {
       continue;
     }
diff --git a/src/input.ts b/src/input.ts
index 293a182d..4c574efa 100644
--- a/src/input.ts
+++ b/src/input.ts
@@ -51,7 +51,7 @@ const RULES: IRule[] = [
     `only one of 'conda-version: ${i.condaVersion}' or 'auto-update-conda: true' may be provided`,
   (i) =>
     !!(i.pythonVersion && !i.activateEnvironment) &&
-    `'python-version: ${i.pythonVersion}' requires 'activate-environment: true'`,
+    `'python-version: ${i.pythonVersion}' requires 'activate-environment' to be set`,
   (i) =>
     !!(i.minicondaVersion && i.miniforgeVersion) &&
     `only one of 'miniconda-version: ${i.minicondaVersion}' or 'miniforge-version: ${i.miniforgeVersion}' may be provided`,
@@ -93,6 +93,11 @@ export async function parseInputs(): Promise<types.IActionInputs> {
     // https://github.com/conda-incubator/setup-miniconda/issues/385
     arch = "aarch64";
   }
+  if (core.getInput("auto-activate-base") !== "legacy-placeholder") {
+    core.warning(
+      "`auto-activate-base` is deprecated. Please use `auto-activate`.",
+    );
+  }
   const inputs: types.IActionInputs = Object.freeze({
     activateEnvironment: core.getInput("activate-environment"),
     architecture: arch,
@@ -116,7 +121,10 @@ export async function parseInputs(): Promise<types.IActionInputs> {
         "add-pip-as-python-dependency",
       ),
       allow_softlinks: core.getInput("allow-softlinks"),
-      auto_activate_base: core.getInput("auto-activate-base"),
+      auto_activate:
+        core.getInput("auto-activate-base") === "legacy-placeholder"
+          ? core.getInput("auto-activate")
+          : core.getInput("auto-activate-base"),
       auto_update_conda: core.getInput("auto-update-conda"),
       channel_alias: core.getInput("channel-alias"),
       channel_priority: core.getInput("channel-priority"),
diff --git a/src/types.ts b/src/types.ts
index d0df6ea9..08927f0f 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -56,7 +56,7 @@ export interface ICondaConfig {
   add_anaconda_token: string;
   add_pip_as_python_dependency: string;
   allow_softlinks: string;
-  auto_activate_base: string;
+  auto_activate: string;
   auto_update_conda: string;
   channel_alias: string;
   channel_priority: string;

From a02b2ffb615ca5bdee5e93a1d5c2068497152cf9 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 09:51:42 -0700
Subject: [PATCH 03/16] Activate default environment instead of base
 environment

---
 src/conda.ts | 41 ++++++++++++++++++++++++++++++++++-------
 src/input.ts |  1 +
 src/types.ts |  1 +
 3 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/src/conda.ts b/src/conda.ts
index e5512cbc..51ab830d 100644
--- a/src/conda.ts
+++ b/src/conda.ts
@@ -290,6 +290,30 @@ export async function applyCondaConfiguration(
   await condaCommand(["config", "--show"], inputs, options);
 }
 
+/*
+ * Whether an environment is the default environment
+ */
+async function isDefaultEnvironment(
+  envName: string,
+  inputs: types.IActionInputs,
+  options: types.IDynamicOptions,
+): Promise<boolean> {
+  if (envName === "") {
+    return false;
+  }
+  const configsOutput = (await condaCommand(
+    ["config", "--show", "--json"],
+    inputs,
+    options,
+    true,
+  )) as string;
+  const config = JSON.parse(configsOutput) as types.ICondaConfig;
+  if (config.default_activation_env) {
+    return config.default_activation_env === envName;
+  }
+  return !utils.isBaseEnv(envName);
+}
+
 /**
  * Initialize Conda
  */
@@ -298,10 +322,13 @@ export async function condaInit(
   options: types.IDynamicOptions,
 ): Promise<void> {
   let ownPath: string;
-  const isValidActivate = !utils.isBaseEnv(inputs.activateEnvironment);
-  const autoActivateBase: boolean =
-    options.condaConfig.auto_activate_base === "true" ||
-    inputs.activateEnvironment === "base";
+  const isValidActivate = !(await isDefaultEnvironment(
+    inputs.activateEnvironment,
+    inputs,
+    options,
+  ));
+  const autoActivateDefault: boolean =
+    options.condaConfig.auto_activate === "true";
 
   // Fix ownership of folders
   if (options.useBundled) {
@@ -392,10 +419,10 @@ export async function condaInit(
   // Batch profiles
   let batchExtraText = `
   :: ---------------------------------------------------------------------------`;
-  if (autoActivateBase) {
+  if (autoActivateDefault) {
     batchExtraText += `
-  :: Conda Setup Action: Activate base
-  @CALL "%CONDA_BAT%" activate base`;
+  :: Conda Setup Action: Activate default environment
+  @CALL "%CONDA_BAT%" activate`;
   }
   if (isValidActivate) {
     batchExtraText += `
diff --git a/src/input.ts b/src/input.ts
index 4c574efa..a4918da6 100644
--- a/src/input.ts
+++ b/src/input.ts
@@ -129,6 +129,7 @@ export async function parseInputs(): Promise<types.IActionInputs> {
       channel_alias: core.getInput("channel-alias"),
       channel_priority: core.getInput("channel-priority"),
       channels: core.getInput("channels"),
+      default_activation_env: "", // Needed for type definition
       show_channel_urls: core.getInput("show-channel-urls"),
       use_only_tar_bz2: core.getInput("use-only-tar-bz2"),
       solver: core.getInput("conda-solver"),
diff --git a/src/types.ts b/src/types.ts
index 08927f0f..f79961d8 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -61,6 +61,7 @@ export interface ICondaConfig {
   channel_alias: string;
   channel_priority: string;
   channels: string;
+  default_activation_env: string;
   show_channel_urls: string;
   use_only_tar_bz2: string;
   always_yes: string;

From a0b2b53e066ccf6c77a3435327a230caed1e6c13 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 10:17:38 -0700
Subject: [PATCH 04/16] Replace allShells with shells

---
 src/conda.ts | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/src/conda.ts b/src/conda.ts
index 51ab830d..ed9a0c2f 100644
--- a/src/conda.ts
+++ b/src/conda.ts
@@ -329,6 +329,7 @@ export async function condaInit(
   ));
   const autoActivateDefault: boolean =
     options.condaConfig.auto_activate === "true";
+  const installationDirectory = condaBasePath(inputs, options);
 
   // Fix ownership of folders
   if (options.useBundled) {
@@ -435,7 +436,6 @@ export async function condaInit(
   @SETLOCAL DisableDelayedExpansion
   :: ---------------------------------------------------------------------------`;
 
-  let extraShells: types.IShells;
   const shells: types.IShells = {
     "~/.bash_profile": bashExtraText,
     "~/.profile": bashExtraText,
@@ -446,24 +446,16 @@ export async function condaInit(
     "~/.config/powershell/profile.ps1": powerExtraText,
     "~/Documents/PowerShell/profile.ps1": powerExtraText,
     "~/Documents/WindowsPowerShell/profile.ps1": powerExtraText,
+    [path.join(installationDirectory, "etc", "profile.d", "conda.sh")]:
+      bashExtraText,
+    [path.join(installationDirectory, "etc", "fish", "conf.d", "conda.fish")]:
+      bashExtraText,
+    [path.join(installationDirectory, "condabin", "conda_hook.bat")]:
+      batchExtraText,
   };
-  if (options.useBundled) {
-    extraShells = {
-      "C:/Miniconda/etc/profile.d/conda.sh": bashExtraText,
-      "C:/Miniconda/etc/fish/conf.d/conda.fish": bashExtraText,
-      "C:/Miniconda/condabin/conda_hook.bat": batchExtraText,
-    };
-  } else {
-    extraShells = {
-      "~/miniconda3/etc/profile.d/conda.sh": bashExtraText,
-      "~/miniconda3/etc/fish/conf.d/conda.fish": bashExtraText,
-      "~/miniconda3/condabin/conda_hook.bat": batchExtraText,
-    };
-  }
-  const allShells: types.IShells = { ...shells, ...extraShells };
-  Object.keys(allShells).forEach((key) => {
+  Object.keys(shells).forEach((key) => {
     let filePath: string = key.replace("~", os.homedir());
-    const text = allShells[key];
+    const text = shells[key];
     if (fs.existsSync(filePath)) {
       core.info(`Append to "${filePath}":\n ${text} \n`);
       fs.appendFileSync(filePath, text);

From e683293e41b483704814a7d780c7c94b2d7f8e7d Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 10:25:19 -0700
Subject: [PATCH 05/16] Regenerate JS files

---
 dist/delete/index.js | 279 ++++++++---------------------------
 dist/setup/index.js  | 344 ++++++++++++-------------------------------
 2 files changed, 153 insertions(+), 470 deletions(-)

diff --git a/dist/delete/index.js b/dist/delete/index.js
index b5c85339..bccaff88 100644
--- a/dist/delete/index.js
+++ b/dist/delete/index.js
@@ -3189,9 +3189,6 @@ function copyFile(srcFile, destFile, force) {
 /***/ 1532:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const ANY = Symbol('SemVer ANY')
 // hoisted class for cyclic dependency
 class Comparator {
@@ -3340,9 +3337,6 @@ const Range = __nccwpck_require__(9828)
 /***/ 9828:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SPACE_CHARACTERS = /\s+/g
 
 // hoisted class for cyclic dependency
@@ -3904,9 +3898,6 @@ const testSet = (set, version, options) => {
 /***/ 8088:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const debug = __nccwpck_require__(427)
 const { MAX_LENGTH, MAX_SAFE_INTEGER } = __nccwpck_require__(2293)
 const { safeRe: re, t } = __nccwpck_require__(9523)
@@ -3919,7 +3910,7 @@ class SemVer {
 
     if (version instanceof SemVer) {
       if (version.loose === !!options.loose &&
-        version.includePrerelease === !!options.includePrerelease) {
+          version.includePrerelease === !!options.includePrerelease) {
         return version
       } else {
         version = version.version
@@ -4085,19 +4076,6 @@ class SemVer {
   // preminor will bump the version up to the next minor release, and immediately
   // down to pre-release. premajor and prepatch work the same way.
   inc (release, identifier, identifierBase) {
-    if (release.startsWith('pre')) {
-      if (!identifier && identifierBase === false) {
-        throw new Error('invalid increment argument: identifier is empty')
-      }
-      // Avoid an invalid semver results
-      if (identifier) {
-        const match = `-${identifier}`.match(this.options.loose ? re[t.PRERELEASELOOSE] : re[t.PRERELEASE])
-        if (!match || match[1] !== identifier) {
-          throw new Error(`invalid identifier: ${identifier}`)
-        }
-      }
-    }
-
     switch (release) {
       case 'premajor':
         this.prerelease.length = 0
@@ -4128,12 +4106,6 @@ class SemVer {
         }
         this.inc('pre', identifier, identifierBase)
         break
-      case 'release':
-        if (this.prerelease.length === 0) {
-          throw new Error(`version ${this.raw} is not a prerelease`)
-        }
-        this.prerelease.length = 0
-        break
 
       case 'major':
         // If this is a pre-major version, bump up to the same major version.
@@ -4177,6 +4149,10 @@ class SemVer {
       case 'pre': {
         const base = Number(identifierBase) ? 1 : 0
 
+        if (!identifier && identifierBase === false) {
+          throw new Error('invalid increment argument: identifier is empty')
+        }
+
         if (this.prerelease.length === 0) {
           this.prerelease = [base]
         } else {
@@ -4231,9 +4207,6 @@ module.exports = SemVer
 /***/ 8848:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const parse = __nccwpck_require__(5925)
 const clean = (version, options) => {
   const s = parse(version.trim().replace(/^[=v]+/, ''), options)
@@ -4247,9 +4220,6 @@ module.exports = clean
 /***/ 5098:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const eq = __nccwpck_require__(1898)
 const neq = __nccwpck_require__(6017)
 const gt = __nccwpck_require__(4123)
@@ -4309,9 +4279,6 @@ module.exports = cmp
 /***/ 3466:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const parse = __nccwpck_require__(5925)
 const { safeRe: re, t } = __nccwpck_require__(9523)
@@ -4379,9 +4346,6 @@ module.exports = coerce
 /***/ 2156:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const compareBuild = (a, b, loose) => {
   const versionA = new SemVer(a, loose)
@@ -4396,9 +4360,6 @@ module.exports = compareBuild
 /***/ 2804:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const compareLoose = (a, b) => compare(a, b, true)
 module.exports = compareLoose
@@ -4409,9 +4370,6 @@ module.exports = compareLoose
 /***/ 4309:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const compare = (a, b, loose) =>
   new SemVer(a, loose).compare(new SemVer(b, loose))
@@ -4424,9 +4382,6 @@ module.exports = compare
 /***/ 4297:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const parse = __nccwpck_require__(5925)
 
 const diff = (version1, version2) => {
@@ -4456,13 +4411,20 @@ const diff = (version1, version2) => {
       return 'major'
     }
 
-    // If the main part has no difference
-    if (lowVersion.compareMain(highVersion) === 0) {
-      if (lowVersion.minor && !lowVersion.patch) {
-        return 'minor'
-      }
+    // Otherwise it can be determined by checking the high version
+
+    if (highVersion.patch) {
+      // anything higher than a patch bump would result in the wrong version
       return 'patch'
     }
+
+    if (highVersion.minor) {
+      // anything higher than a minor bump would result in the wrong version
+      return 'minor'
+    }
+
+    // bumping major/minor/patch all have same result
+    return 'major'
   }
 
   // add the `pre` prefix if we are going to a prerelease version
@@ -4492,9 +4454,6 @@ module.exports = diff
 /***/ 1898:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const eq = (a, b, loose) => compare(a, b, loose) === 0
 module.exports = eq
@@ -4505,9 +4464,6 @@ module.exports = eq
 /***/ 4123:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const gt = (a, b, loose) => compare(a, b, loose) > 0
 module.exports = gt
@@ -4518,9 +4474,6 @@ module.exports = gt
 /***/ 5522:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const gte = (a, b, loose) => compare(a, b, loose) >= 0
 module.exports = gte
@@ -4531,9 +4484,6 @@ module.exports = gte
 /***/ 900:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 
 const inc = (version, release, options, identifier, identifierBase) => {
@@ -4560,9 +4510,6 @@ module.exports = inc
 /***/ 194:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const lt = (a, b, loose) => compare(a, b, loose) < 0
 module.exports = lt
@@ -4573,9 +4520,6 @@ module.exports = lt
 /***/ 7520:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const lte = (a, b, loose) => compare(a, b, loose) <= 0
 module.exports = lte
@@ -4586,9 +4530,6 @@ module.exports = lte
 /***/ 6688:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const major = (a, loose) => new SemVer(a, loose).major
 module.exports = major
@@ -4599,9 +4540,6 @@ module.exports = major
 /***/ 8447:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const minor = (a, loose) => new SemVer(a, loose).minor
 module.exports = minor
@@ -4612,9 +4550,6 @@ module.exports = minor
 /***/ 6017:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const neq = (a, b, loose) => compare(a, b, loose) !== 0
 module.exports = neq
@@ -4625,9 +4560,6 @@ module.exports = neq
 /***/ 5925:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const parse = (version, options, throwErrors = false) => {
   if (version instanceof SemVer) {
@@ -4651,9 +4583,6 @@ module.exports = parse
 /***/ 2866:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const patch = (a, loose) => new SemVer(a, loose).patch
 module.exports = patch
@@ -4664,9 +4593,6 @@ module.exports = patch
 /***/ 4016:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const parse = __nccwpck_require__(5925)
 const prerelease = (version, options) => {
   const parsed = parse(version, options)
@@ -4680,9 +4606,6 @@ module.exports = prerelease
 /***/ 6417:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const rcompare = (a, b, loose) => compare(b, a, loose)
 module.exports = rcompare
@@ -4693,9 +4616,6 @@ module.exports = rcompare
 /***/ 8701:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compareBuild = __nccwpck_require__(2156)
 const rsort = (list, loose) => list.sort((a, b) => compareBuild(b, a, loose))
 module.exports = rsort
@@ -4706,9 +4626,6 @@ module.exports = rsort
 /***/ 6055:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 const satisfies = (version, range, options) => {
   try {
@@ -4726,9 +4643,6 @@ module.exports = satisfies
 /***/ 1426:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compareBuild = __nccwpck_require__(2156)
 const sort = (list, loose) => list.sort((a, b) => compareBuild(a, b, loose))
 module.exports = sort
@@ -4739,9 +4653,6 @@ module.exports = sort
 /***/ 9601:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const parse = __nccwpck_require__(5925)
 const valid = (version, options) => {
   const v = parse(version, options)
@@ -4755,9 +4666,6 @@ module.exports = valid
 /***/ 1383:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 // just pre-load all the stuff that index.js lazily exports
 const internalRe = __nccwpck_require__(9523)
 const constants = __nccwpck_require__(2293)
@@ -4854,9 +4762,6 @@ module.exports = {
 /***/ 2293:
 /***/ ((module) => {
 
-"use strict";
-
-
 // Note: this is the semver.org version of the spec that it implements
 // Not necessarily the package version of this code.
 const SEMVER_SPEC_VERSION = '2.0.0'
@@ -4899,9 +4804,6 @@ module.exports = {
 /***/ 427:
 /***/ ((module) => {
 
-"use strict";
-
-
 const debug = (
   typeof process === 'object' &&
   process.env &&
@@ -4918,9 +4820,6 @@ module.exports = debug
 /***/ 2463:
 /***/ ((module) => {
 
-"use strict";
-
-
 const numeric = /^[0-9]+$/
 const compareIdentifiers = (a, b) => {
   const anum = numeric.test(a)
@@ -4951,9 +4850,6 @@ module.exports = {
 /***/ 5339:
 /***/ ((module) => {
 
-"use strict";
-
-
 class LRUCache {
   constructor () {
     this.max = 1000
@@ -5001,9 +4897,6 @@ module.exports = LRUCache
 /***/ 785:
 /***/ ((module) => {
 
-"use strict";
-
-
 // parse out just the options we care about
 const looseOption = Object.freeze({ loose: true })
 const emptyOpts = Object.freeze({ })
@@ -5026,9 +4919,6 @@ module.exports = parseOptions
 /***/ 9523:
 /***/ ((module, exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const {
   MAX_SAFE_COMPONENT_LENGTH,
   MAX_SAFE_BUILD_LENGTH,
@@ -5041,7 +4931,6 @@ exports = module.exports = {}
 const re = exports.re = []
 const safeRe = exports.safeRe = []
 const src = exports.src = []
-const safeSrc = exports.safeSrc = []
 const t = exports.t = {}
 let R = 0
 
@@ -5074,7 +4963,6 @@ const createToken = (name, value, isGlobal) => {
   debug(name, index, value)
   t[name] = index
   src[index] = value
-  safeSrc[index] = safe
   re[index] = new RegExp(value, isGlobal ? 'g' : undefined)
   safeRe[index] = new RegExp(safe, isGlobal ? 'g' : undefined)
 }
@@ -5107,14 +4995,12 @@ createToken('MAINVERSIONLOOSE', `(${src[t.NUMERICIDENTIFIERLOOSE]})\\.` +
 
 // ## Pre-release Version Identifier
 // A numeric identifier, or a non-numeric identifier.
-// Non-numberic identifiers include numberic identifiers but can be longer.
-// Therefore non-numberic identifiers must go first.
 
-createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NONNUMERICIDENTIFIER]
-}|${src[t.NUMERICIDENTIFIER]})`)
+createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NUMERICIDENTIFIER]
+}|${src[t.NONNUMERICIDENTIFIER]})`)
 
-createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NONNUMERICIDENTIFIER]
-}|${src[t.NUMERICIDENTIFIERLOOSE]})`)
+createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NUMERICIDENTIFIERLOOSE]
+}|${src[t.NONNUMERICIDENTIFIER]})`)
 
 // ## Pre-release Version
 // Hyphen, followed by one or more dot-separated pre-release version
@@ -5257,9 +5143,6 @@ createToken('GTE0PRE', '^\\s*>=\\s*0\\.0\\.0-0\\s*$')
 /***/ 9380:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 // Determine if version is greater than all the versions possible in the range.
 const outside = __nccwpck_require__(420)
 const gtr = (version, range, options) => outside(version, range, '>', options)
@@ -5271,9 +5154,6 @@ module.exports = gtr
 /***/ 7008:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 const intersects = (r1, r2, options) => {
   r1 = new Range(r1, options)
@@ -5288,9 +5168,6 @@ module.exports = intersects
 /***/ 3323:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const outside = __nccwpck_require__(420)
 // Determine if version is less than all the versions possible in the range
 const ltr = (version, range, options) => outside(version, range, '<', options)
@@ -5302,9 +5179,6 @@ module.exports = ltr
 /***/ 579:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 
@@ -5337,9 +5211,6 @@ module.exports = maxSatisfying
 /***/ 832:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 const minSatisfying = (versions, range, options) => {
@@ -5371,9 +5242,6 @@ module.exports = minSatisfying
 /***/ 4179:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 const gt = __nccwpck_require__(4123)
@@ -5442,9 +5310,6 @@ module.exports = minVersion
 /***/ 420:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const Comparator = __nccwpck_require__(1532)
 const { ANY } = Comparator
@@ -5532,9 +5397,6 @@ module.exports = outside
 /***/ 5297:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 // given a set of versions and a range, create a "simplified" range
 // that includes the same versions that the original range does
 // If the original range is shorter than the simplified one, return that.
@@ -5589,9 +5451,6 @@ module.exports = (versions, range, options) => {
 /***/ 7863:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 const Comparator = __nccwpck_require__(1532)
 const { ANY } = Comparator
@@ -5846,9 +5705,6 @@ module.exports = subset
 /***/ 2706:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 
 // Mostly just for testing and legacy API reasons
@@ -5864,9 +5720,6 @@ module.exports = toComparators
 /***/ 2098:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 const validRange = (range, options) => {
   try {
@@ -11490,7 +11343,7 @@ module.exports = {
 
 
 const { parseSetCookie } = __nccwpck_require__(4408)
-const { stringify } = __nccwpck_require__(3121)
+const { stringify, getHeadersList } = __nccwpck_require__(3121)
 const { webidl } = __nccwpck_require__(1744)
 const { Headers } = __nccwpck_require__(554)
 
@@ -11566,13 +11419,14 @@ function getSetCookies (headers) {
 
   webidl.brandCheck(headers, Headers, { strict: false })
 
-  const cookies = headers.getSetCookie()
+  const cookies = getHeadersList(headers).cookies
 
   if (!cookies) {
     return []
   }
 
-  return cookies.map((pair) => parseSetCookie(pair))
+  // In older versions of undici, cookies is a list of name:value.
+  return cookies.map((pair) => parseSetCookie(Array.isArray(pair) ? pair[1] : pair))
 }
 
 /**
@@ -12000,15 +11854,14 @@ module.exports = {
 /***/ }),
 
 /***/ 3121:
-/***/ ((module) => {
+/***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
 "use strict";
 
 
-/**
- * @param {string} value
- * @returns {boolean}
- */
+const assert = __nccwpck_require__(9491)
+const { kHeadersList } = __nccwpck_require__(2785)
+
 function isCTLExcludingHtab (value) {
   if (value.length === 0) {
     return false
@@ -12269,13 +12122,31 @@ function stringify (cookie) {
   return out.join('; ')
 }
 
+let kHeadersListNode
+
+function getHeadersList (headers) {
+  if (headers[kHeadersList]) {
+    return headers[kHeadersList]
+  }
+
+  if (!kHeadersListNode) {
+    kHeadersListNode = Object.getOwnPropertySymbols(headers).find(
+      (symbol) => symbol.description === 'headers list'
+    )
+
+    assert(kHeadersListNode, 'Headers cannot be parsed')
+  }
+
+  const headersList = headers[kHeadersListNode]
+  assert(headersList)
+
+  return headersList
+}
+
 module.exports = {
   isCTLExcludingHtab,
-  validateCookieName,
-  validateCookiePath,
-  validateCookieValue,
-  toIMFDate,
-  stringify
+  stringify,
+  getHeadersList
 }
 
 
@@ -14204,14 +14075,6 @@ const { isUint8Array, isArrayBuffer } = __nccwpck_require__(9830)
 const { File: UndiciFile } = __nccwpck_require__(8511)
 const { parseMIMEType, serializeAMimeType } = __nccwpck_require__(685)
 
-let random
-try {
-  const crypto = __nccwpck_require__(6005)
-  random = (max) => crypto.randomInt(0, max)
-} catch {
-  random = (max) => Math.floor(Math.random(max))
-}
-
 let ReadableStream = globalThis.ReadableStream
 
 /** @type {globalThis['File']} */
@@ -14297,7 +14160,7 @@ function extractBody (object, keepalive = false) {
     // Set source to a copy of the bytes held by object.
     source = new Uint8Array(object.buffer.slice(object.byteOffset, object.byteOffset + object.byteLength))
   } else if (util.isFormDataLike(object)) {
-    const boundary = `----formdata-undici-0${`${random(1e11)}`.padStart(11, '0')}`
+    const boundary = `----formdata-undici-0${`${Math.floor(Math.random() * 1e11)}`.padStart(11, '0')}`
     const prefix = `--${boundary}\r\nContent-Disposition: form-data`
 
     /*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
@@ -16279,7 +16142,6 @@ const {
   isValidHeaderName,
   isValidHeaderValue
 } = __nccwpck_require__(2538)
-const util = __nccwpck_require__(3837)
 const { webidl } = __nccwpck_require__(1744)
 const assert = __nccwpck_require__(9491)
 
@@ -16833,9 +16695,6 @@ Object.defineProperties(Headers.prototype, {
   [Symbol.toStringTag]: {
     value: 'Headers',
     configurable: true
-  },
-  [util.inspect.custom]: {
-    enumerable: false
   }
 })
 
@@ -26012,20 +25871,6 @@ class Pool extends PoolBase {
       ? { ...options.interceptors }
       : undefined
     this[kFactory] = factory
-
-    this.on('connectionError', (origin, targets, error) => {
-      // If a connection error occurs, we remove the client from the pool,
-      // and emit a connectionError event. They will not be re-used.
-      // Fixes https://github.com/nodejs/undici/issues/3895
-      for (const target of targets) {
-        // Do not use kRemoveClient here, as it will close the client,
-        // but the client cannot be closed in this state.
-        const idx = this[kClients].indexOf(target)
-        if (idx !== -1) {
-          this[kClients].splice(idx, 1)
-        }
-      }
-    })
   }
 
   [kGetDispatcher] () {
@@ -28667,7 +28512,7 @@ const RULES = [
     (i, c) => !!(i.condaVersion && c.auto_update_conda === "true") &&
         `only one of 'conda-version: ${i.condaVersion}' or 'auto-update-conda: true' may be provided`,
     (i) => !!(i.pythonVersion && !i.activateEnvironment) &&
-        `'python-version: ${i.pythonVersion}' requires 'activate-environment: true'`,
+        `'python-version: ${i.pythonVersion}' requires 'activate-environment' to be set`,
     (i) => !!(i.minicondaVersion && i.miniforgeVersion) &&
         `only one of 'miniconda-version: ${i.minicondaVersion}' or 'miniforge-version: ${i.miniforgeVersion}' may be provided`,
     (i) => !!(i.installerUrl && i.minicondaVersion) &&
@@ -28693,6 +28538,9 @@ function parseInputs() {
             // https://github.com/conda-incubator/setup-miniconda/issues/385
             arch = "aarch64";
         }
+        if (core.getInput("auto-activate-base") !== "legacy-placeholder") {
+            core.warning("`auto-activate-base` is deprecated. Please use `auto-activate`.");
+        }
         const inputs = Object.freeze({
             activateEnvironment: core.getInput("activate-environment"),
             architecture: arch,
@@ -28714,11 +28562,14 @@ function parseInputs() {
                 add_anaconda_token: core.getInput("add-anaconda-token"),
                 add_pip_as_python_dependency: core.getInput("add-pip-as-python-dependency"),
                 allow_softlinks: core.getInput("allow-softlinks"),
-                auto_activate_base: core.getInput("auto-activate-base"),
+                auto_activate: core.getInput("auto-activate-base") === "legacy-placeholder"
+                    ? core.getInput("auto-activate")
+                    : core.getInput("auto-activate-base"),
                 auto_update_conda: core.getInput("auto-update-conda"),
                 channel_alias: core.getInput("channel-alias"),
                 channel_priority: core.getInput("channel-priority"),
                 channels: core.getInput("channels"),
+                default_activation_env: "", // Needed for type definition
                 show_channel_urls: core.getInput("show-channel-urls"),
                 use_only_tar_bz2: core.getInput("use-only-tar-bz2"),
                 solver: core.getInput("conda-solver"),
@@ -28997,14 +28848,6 @@ module.exports = require("net");
 
 /***/ }),
 
-/***/ 6005:
-/***/ ((module) => {
-
-"use strict";
-module.exports = require("node:crypto");
-
-/***/ }),
-
 /***/ 5673:
 /***/ ((module) => {
 
diff --git a/dist/setup/index.js b/dist/setup/index.js
index 4657164a..78995264 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -21201,9 +21201,6 @@ exports.parse = parse;
 /***/ 1532:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const ANY = Symbol('SemVer ANY')
 // hoisted class for cyclic dependency
 class Comparator {
@@ -21352,9 +21349,6 @@ const Range = __nccwpck_require__(9828)
 /***/ 9828:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SPACE_CHARACTERS = /\s+/g
 
 // hoisted class for cyclic dependency
@@ -21916,9 +21910,6 @@ const testSet = (set, version, options) => {
 /***/ 8088:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const debug = __nccwpck_require__(427)
 const { MAX_LENGTH, MAX_SAFE_INTEGER } = __nccwpck_require__(2293)
 const { safeRe: re, t } = __nccwpck_require__(9523)
@@ -21931,7 +21922,7 @@ class SemVer {
 
     if (version instanceof SemVer) {
       if (version.loose === !!options.loose &&
-        version.includePrerelease === !!options.includePrerelease) {
+          version.includePrerelease === !!options.includePrerelease) {
         return version
       } else {
         version = version.version
@@ -22097,19 +22088,6 @@ class SemVer {
   // preminor will bump the version up to the next minor release, and immediately
   // down to pre-release. premajor and prepatch work the same way.
   inc (release, identifier, identifierBase) {
-    if (release.startsWith('pre')) {
-      if (!identifier && identifierBase === false) {
-        throw new Error('invalid increment argument: identifier is empty')
-      }
-      // Avoid an invalid semver results
-      if (identifier) {
-        const match = `-${identifier}`.match(this.options.loose ? re[t.PRERELEASELOOSE] : re[t.PRERELEASE])
-        if (!match || match[1] !== identifier) {
-          throw new Error(`invalid identifier: ${identifier}`)
-        }
-      }
-    }
-
     switch (release) {
       case 'premajor':
         this.prerelease.length = 0
@@ -22140,12 +22118,6 @@ class SemVer {
         }
         this.inc('pre', identifier, identifierBase)
         break
-      case 'release':
-        if (this.prerelease.length === 0) {
-          throw new Error(`version ${this.raw} is not a prerelease`)
-        }
-        this.prerelease.length = 0
-        break
 
       case 'major':
         // If this is a pre-major version, bump up to the same major version.
@@ -22189,6 +22161,10 @@ class SemVer {
       case 'pre': {
         const base = Number(identifierBase) ? 1 : 0
 
+        if (!identifier && identifierBase === false) {
+          throw new Error('invalid increment argument: identifier is empty')
+        }
+
         if (this.prerelease.length === 0) {
           this.prerelease = [base]
         } else {
@@ -22243,9 +22219,6 @@ module.exports = SemVer
 /***/ 8848:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const parse = __nccwpck_require__(5925)
 const clean = (version, options) => {
   const s = parse(version.trim().replace(/^[=v]+/, ''), options)
@@ -22259,9 +22232,6 @@ module.exports = clean
 /***/ 5098:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const eq = __nccwpck_require__(1898)
 const neq = __nccwpck_require__(6017)
 const gt = __nccwpck_require__(4123)
@@ -22321,9 +22291,6 @@ module.exports = cmp
 /***/ 3466:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const parse = __nccwpck_require__(5925)
 const { safeRe: re, t } = __nccwpck_require__(9523)
@@ -22391,9 +22358,6 @@ module.exports = coerce
 /***/ 2156:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const compareBuild = (a, b, loose) => {
   const versionA = new SemVer(a, loose)
@@ -22408,9 +22372,6 @@ module.exports = compareBuild
 /***/ 2804:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const compareLoose = (a, b) => compare(a, b, true)
 module.exports = compareLoose
@@ -22421,9 +22382,6 @@ module.exports = compareLoose
 /***/ 4309:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const compare = (a, b, loose) =>
   new SemVer(a, loose).compare(new SemVer(b, loose))
@@ -22436,9 +22394,6 @@ module.exports = compare
 /***/ 4297:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const parse = __nccwpck_require__(5925)
 
 const diff = (version1, version2) => {
@@ -22468,13 +22423,20 @@ const diff = (version1, version2) => {
       return 'major'
     }
 
-    // If the main part has no difference
-    if (lowVersion.compareMain(highVersion) === 0) {
-      if (lowVersion.minor && !lowVersion.patch) {
-        return 'minor'
-      }
+    // Otherwise it can be determined by checking the high version
+
+    if (highVersion.patch) {
+      // anything higher than a patch bump would result in the wrong version
       return 'patch'
     }
+
+    if (highVersion.minor) {
+      // anything higher than a minor bump would result in the wrong version
+      return 'minor'
+    }
+
+    // bumping major/minor/patch all have same result
+    return 'major'
   }
 
   // add the `pre` prefix if we are going to a prerelease version
@@ -22504,9 +22466,6 @@ module.exports = diff
 /***/ 1898:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const eq = (a, b, loose) => compare(a, b, loose) === 0
 module.exports = eq
@@ -22517,9 +22476,6 @@ module.exports = eq
 /***/ 4123:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const gt = (a, b, loose) => compare(a, b, loose) > 0
 module.exports = gt
@@ -22530,9 +22486,6 @@ module.exports = gt
 /***/ 5522:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const gte = (a, b, loose) => compare(a, b, loose) >= 0
 module.exports = gte
@@ -22543,9 +22496,6 @@ module.exports = gte
 /***/ 900:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 
 const inc = (version, release, options, identifier, identifierBase) => {
@@ -22572,9 +22522,6 @@ module.exports = inc
 /***/ 194:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const lt = (a, b, loose) => compare(a, b, loose) < 0
 module.exports = lt
@@ -22585,9 +22532,6 @@ module.exports = lt
 /***/ 7520:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const lte = (a, b, loose) => compare(a, b, loose) <= 0
 module.exports = lte
@@ -22598,9 +22542,6 @@ module.exports = lte
 /***/ 6688:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const major = (a, loose) => new SemVer(a, loose).major
 module.exports = major
@@ -22611,9 +22552,6 @@ module.exports = major
 /***/ 8447:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const minor = (a, loose) => new SemVer(a, loose).minor
 module.exports = minor
@@ -22624,9 +22562,6 @@ module.exports = minor
 /***/ 6017:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const neq = (a, b, loose) => compare(a, b, loose) !== 0
 module.exports = neq
@@ -22637,9 +22572,6 @@ module.exports = neq
 /***/ 5925:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const parse = (version, options, throwErrors = false) => {
   if (version instanceof SemVer) {
@@ -22663,9 +22595,6 @@ module.exports = parse
 /***/ 2866:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const patch = (a, loose) => new SemVer(a, loose).patch
 module.exports = patch
@@ -22676,9 +22605,6 @@ module.exports = patch
 /***/ 4016:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const parse = __nccwpck_require__(5925)
 const prerelease = (version, options) => {
   const parsed = parse(version, options)
@@ -22692,9 +22618,6 @@ module.exports = prerelease
 /***/ 6417:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compare = __nccwpck_require__(4309)
 const rcompare = (a, b, loose) => compare(b, a, loose)
 module.exports = rcompare
@@ -22705,9 +22628,6 @@ module.exports = rcompare
 /***/ 8701:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compareBuild = __nccwpck_require__(2156)
 const rsort = (list, loose) => list.sort((a, b) => compareBuild(b, a, loose))
 module.exports = rsort
@@ -22718,9 +22638,6 @@ module.exports = rsort
 /***/ 6055:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 const satisfies = (version, range, options) => {
   try {
@@ -22738,9 +22655,6 @@ module.exports = satisfies
 /***/ 1426:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const compareBuild = __nccwpck_require__(2156)
 const sort = (list, loose) => list.sort((a, b) => compareBuild(a, b, loose))
 module.exports = sort
@@ -22751,9 +22665,6 @@ module.exports = sort
 /***/ 9601:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const parse = __nccwpck_require__(5925)
 const valid = (version, options) => {
   const v = parse(version, options)
@@ -22767,9 +22678,6 @@ module.exports = valid
 /***/ 1383:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 // just pre-load all the stuff that index.js lazily exports
 const internalRe = __nccwpck_require__(9523)
 const constants = __nccwpck_require__(2293)
@@ -22866,9 +22774,6 @@ module.exports = {
 /***/ 2293:
 /***/ ((module) => {
 
-"use strict";
-
-
 // Note: this is the semver.org version of the spec that it implements
 // Not necessarily the package version of this code.
 const SEMVER_SPEC_VERSION = '2.0.0'
@@ -22911,9 +22816,6 @@ module.exports = {
 /***/ 427:
 /***/ ((module) => {
 
-"use strict";
-
-
 const debug = (
   typeof process === 'object' &&
   process.env &&
@@ -22930,9 +22832,6 @@ module.exports = debug
 /***/ 2463:
 /***/ ((module) => {
 
-"use strict";
-
-
 const numeric = /^[0-9]+$/
 const compareIdentifiers = (a, b) => {
   const anum = numeric.test(a)
@@ -22963,9 +22862,6 @@ module.exports = {
 /***/ 5339:
 /***/ ((module) => {
 
-"use strict";
-
-
 class LRUCache {
   constructor () {
     this.max = 1000
@@ -23013,9 +22909,6 @@ module.exports = LRUCache
 /***/ 785:
 /***/ ((module) => {
 
-"use strict";
-
-
 // parse out just the options we care about
 const looseOption = Object.freeze({ loose: true })
 const emptyOpts = Object.freeze({ })
@@ -23038,9 +22931,6 @@ module.exports = parseOptions
 /***/ 9523:
 /***/ ((module, exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const {
   MAX_SAFE_COMPONENT_LENGTH,
   MAX_SAFE_BUILD_LENGTH,
@@ -23053,7 +22943,6 @@ exports = module.exports = {}
 const re = exports.re = []
 const safeRe = exports.safeRe = []
 const src = exports.src = []
-const safeSrc = exports.safeSrc = []
 const t = exports.t = {}
 let R = 0
 
@@ -23086,7 +22975,6 @@ const createToken = (name, value, isGlobal) => {
   debug(name, index, value)
   t[name] = index
   src[index] = value
-  safeSrc[index] = safe
   re[index] = new RegExp(value, isGlobal ? 'g' : undefined)
   safeRe[index] = new RegExp(safe, isGlobal ? 'g' : undefined)
 }
@@ -23119,14 +23007,12 @@ createToken('MAINVERSIONLOOSE', `(${src[t.NUMERICIDENTIFIERLOOSE]})\\.` +
 
 // ## Pre-release Version Identifier
 // A numeric identifier, or a non-numeric identifier.
-// Non-numberic identifiers include numberic identifiers but can be longer.
-// Therefore non-numberic identifiers must go first.
 
-createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NONNUMERICIDENTIFIER]
-}|${src[t.NUMERICIDENTIFIER]})`)
+createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NUMERICIDENTIFIER]
+}|${src[t.NONNUMERICIDENTIFIER]})`)
 
-createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NONNUMERICIDENTIFIER]
-}|${src[t.NUMERICIDENTIFIERLOOSE]})`)
+createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NUMERICIDENTIFIERLOOSE]
+}|${src[t.NONNUMERICIDENTIFIER]})`)
 
 // ## Pre-release Version
 // Hyphen, followed by one or more dot-separated pre-release version
@@ -23269,9 +23155,6 @@ createToken('GTE0PRE', '^\\s*>=\\s*0\\.0\\.0-0\\s*$')
 /***/ 9380:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 // Determine if version is greater than all the versions possible in the range.
 const outside = __nccwpck_require__(420)
 const gtr = (version, range, options) => outside(version, range, '>', options)
@@ -23283,9 +23166,6 @@ module.exports = gtr
 /***/ 7008:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 const intersects = (r1, r2, options) => {
   r1 = new Range(r1, options)
@@ -23300,9 +23180,6 @@ module.exports = intersects
 /***/ 3323:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const outside = __nccwpck_require__(420)
 // Determine if version is less than all the versions possible in the range
 const ltr = (version, range, options) => outside(version, range, '<', options)
@@ -23314,9 +23191,6 @@ module.exports = ltr
 /***/ 579:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 
@@ -23349,9 +23223,6 @@ module.exports = maxSatisfying
 /***/ 832:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 const minSatisfying = (versions, range, options) => {
@@ -23383,9 +23254,6 @@ module.exports = minSatisfying
 /***/ 4179:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 const gt = __nccwpck_require__(4123)
@@ -23454,9 +23322,6 @@ module.exports = minVersion
 /***/ 420:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const SemVer = __nccwpck_require__(8088)
 const Comparator = __nccwpck_require__(1532)
 const { ANY } = Comparator
@@ -23544,9 +23409,6 @@ module.exports = outside
 /***/ 5297:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 // given a set of versions and a range, create a "simplified" range
 // that includes the same versions that the original range does
 // If the original range is shorter than the simplified one, return that.
@@ -23601,9 +23463,6 @@ module.exports = (versions, range, options) => {
 /***/ 7863:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 const Comparator = __nccwpck_require__(1532)
 const { ANY } = Comparator
@@ -23858,9 +23717,6 @@ module.exports = subset
 /***/ 2706:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 
 // Mostly just for testing and legacy API reasons
@@ -23876,9 +23732,6 @@ module.exports = toComparators
 /***/ 2098:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-"use strict";
-
-
 const Range = __nccwpck_require__(9828)
 const validRange = (range, options) => {
   try {
@@ -29502,7 +29355,7 @@ module.exports = {
 
 
 const { parseSetCookie } = __nccwpck_require__(4408)
-const { stringify } = __nccwpck_require__(3121)
+const { stringify, getHeadersList } = __nccwpck_require__(3121)
 const { webidl } = __nccwpck_require__(1744)
 const { Headers } = __nccwpck_require__(554)
 
@@ -29578,13 +29431,14 @@ function getSetCookies (headers) {
 
   webidl.brandCheck(headers, Headers, { strict: false })
 
-  const cookies = headers.getSetCookie()
+  const cookies = getHeadersList(headers).cookies
 
   if (!cookies) {
     return []
   }
 
-  return cookies.map((pair) => parseSetCookie(pair))
+  // In older versions of undici, cookies is a list of name:value.
+  return cookies.map((pair) => parseSetCookie(Array.isArray(pair) ? pair[1] : pair))
 }
 
 /**
@@ -30012,15 +29866,14 @@ module.exports = {
 /***/ }),
 
 /***/ 3121:
-/***/ ((module) => {
+/***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
 "use strict";
 
 
-/**
- * @param {string} value
- * @returns {boolean}
- */
+const assert = __nccwpck_require__(9491)
+const { kHeadersList } = __nccwpck_require__(2785)
+
 function isCTLExcludingHtab (value) {
   if (value.length === 0) {
     return false
@@ -30281,13 +30134,31 @@ function stringify (cookie) {
   return out.join('; ')
 }
 
+let kHeadersListNode
+
+function getHeadersList (headers) {
+  if (headers[kHeadersList]) {
+    return headers[kHeadersList]
+  }
+
+  if (!kHeadersListNode) {
+    kHeadersListNode = Object.getOwnPropertySymbols(headers).find(
+      (symbol) => symbol.description === 'headers list'
+    )
+
+    assert(kHeadersListNode, 'Headers cannot be parsed')
+  }
+
+  const headersList = headers[kHeadersListNode]
+  assert(headersList)
+
+  return headersList
+}
+
 module.exports = {
   isCTLExcludingHtab,
-  validateCookieName,
-  validateCookiePath,
-  validateCookieValue,
-  toIMFDate,
-  stringify
+  stringify,
+  getHeadersList
 }
 
 
@@ -32216,14 +32087,6 @@ const { isUint8Array, isArrayBuffer } = __nccwpck_require__(9830)
 const { File: UndiciFile } = __nccwpck_require__(8511)
 const { parseMIMEType, serializeAMimeType } = __nccwpck_require__(685)
 
-let random
-try {
-  const crypto = __nccwpck_require__(6005)
-  random = (max) => crypto.randomInt(0, max)
-} catch {
-  random = (max) => Math.floor(Math.random(max))
-}
-
 let ReadableStream = globalThis.ReadableStream
 
 /** @type {globalThis['File']} */
@@ -32309,7 +32172,7 @@ function extractBody (object, keepalive = false) {
     // Set source to a copy of the bytes held by object.
     source = new Uint8Array(object.buffer.slice(object.byteOffset, object.byteOffset + object.byteLength))
   } else if (util.isFormDataLike(object)) {
-    const boundary = `----formdata-undici-0${`${random(1e11)}`.padStart(11, '0')}`
+    const boundary = `----formdata-undici-0${`${Math.floor(Math.random() * 1e11)}`.padStart(11, '0')}`
     const prefix = `--${boundary}\r\nContent-Disposition: form-data`
 
     /*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
@@ -34291,7 +34154,6 @@ const {
   isValidHeaderName,
   isValidHeaderValue
 } = __nccwpck_require__(2538)
-const util = __nccwpck_require__(3837)
 const { webidl } = __nccwpck_require__(1744)
 const assert = __nccwpck_require__(9491)
 
@@ -34845,9 +34707,6 @@ Object.defineProperties(Headers.prototype, {
   [Symbol.toStringTag]: {
     value: 'Headers',
     configurable: true
-  },
-  [util.inspect.custom]: {
-    enumerable: false
   }
 })
 
@@ -44024,20 +43883,6 @@ class Pool extends PoolBase {
       ? { ...options.interceptors }
       : undefined
     this[kFactory] = factory
-
-    this.on('connectionError', (origin, targets, error) => {
-      // If a connection error occurs, we remove the client from the pool,
-      // and emit a connectionError event. They will not be re-used.
-      // Fixes https://github.com/nodejs/undici/issues/3895
-      for (const target of targets) {
-        // Do not use kRemoveClient here, as it will close the client,
-        // but the client cannot be closed in this state.
-        const idx = this[kClients].indexOf(target)
-        if (idx !== -1) {
-          this[kClients].splice(idx, 1)
-        }
-      }
-    })
   }
 
   [kGetDispatcher] () {
@@ -46959,25 +46804,19 @@ function applyCondaConfiguration(inputs, options) {
             yield condaCommand(["config", "--add", "pkgs_dirs", pkgsDir], inputs, options);
         }
         // auto_activate_base was renamed to auto_activate in 25.5.0
-        core.info(`auto_activate: ${inputs.condaConfig.auto_activate_base}`);
+        core.info(`auto_activate: ${inputs.condaConfig.auto_activate}`);
         try {
             // 25.5.0+
-            yield condaCommand([
-                "config",
-                "--set",
-                "auto_activate",
-                inputs.condaConfig.auto_activate_base,
-            ], inputs, options);
+            yield condaCommand(["config", "--set", "auto_activate", inputs.condaConfig.auto_activate], inputs, options);
         }
         catch (err) {
             try {
                 // <25.5.0
-                core.warning("Using auto_activate_base is deprecated, please use auto_activate instead");
                 yield condaCommand([
                     "config",
                     "--set",
                     "auto_activate_base",
-                    inputs.condaConfig.auto_activate_base,
+                    inputs.condaConfig.auto_activate,
                 ], inputs, options);
             }
             catch (err2) {
@@ -46989,7 +46828,7 @@ function applyCondaConfiguration(inputs, options) {
             if (value.trim().length === 0 ||
                 key === "channels" ||
                 key === "pkgs_dirs" ||
-                key === "auto_activate_base") {
+                key === "auto_activate") {
                 continue;
             }
             core.info(`${key}: ${value}`);
@@ -47006,15 +46845,31 @@ function applyCondaConfiguration(inputs, options) {
     });
 }
 exports.applyCondaConfiguration = applyCondaConfiguration;
+/*
+ * Whether an environment is the default environment
+ */
+function isDefaultEnvironment(envName, inputs, options) {
+    return __awaiter(this, void 0, void 0, function* () {
+        if (envName === "") {
+            return false;
+        }
+        const configsOutput = (yield condaCommand(["config", "--show", "--json"], inputs, options, true));
+        const config = JSON.parse(configsOutput);
+        if (config.default_activation_env) {
+            return config.default_activation_env === envName;
+        }
+        return !utils.isBaseEnv(envName);
+    });
+}
 /**
  * Initialize Conda
  */
 function condaInit(inputs, options) {
     return __awaiter(this, void 0, void 0, function* () {
         let ownPath;
-        const isValidActivate = !utils.isBaseEnv(inputs.activateEnvironment);
-        const autoActivateBase = options.condaConfig["auto_activate_base"] === "true" ||
-            options.condaConfig["activate_environment"] === "base";
+        const isValidActivate = !(yield isDefaultEnvironment(inputs.activateEnvironment, inputs, options));
+        const autoActivateDefault = options.condaConfig.auto_activate === "true";
+        const installationDirectory = condaBasePath(inputs, options);
         // Fix ownership of folders
         if (options.useBundled) {
             if (constants.IS_MAC) {
@@ -47101,10 +46956,10 @@ function condaInit(inputs, options) {
         // Batch profiles
         let batchExtraText = `
   :: ---------------------------------------------------------------------------`;
-        if (autoActivateBase) {
+        if (autoActivateDefault) {
             batchExtraText += `
-  :: Conda Setup Action: Activate base
-  @CALL "%CONDA_BAT%" activate base`;
+  :: Conda Setup Action: Activate default environment
+  @CALL "%CONDA_BAT%" activate`;
         }
         if (isValidActivate) {
             batchExtraText += `
@@ -47116,7 +46971,6 @@ function condaInit(inputs, options) {
   @SETLOCAL EnableExtensions
   @SETLOCAL DisableDelayedExpansion
   :: ---------------------------------------------------------------------------`;
-        let extraShells;
         const shells = {
             "~/.bash_profile": bashExtraText,
             "~/.profile": bashExtraText,
@@ -47127,25 +46981,13 @@ function condaInit(inputs, options) {
             "~/.config/powershell/profile.ps1": powerExtraText,
             "~/Documents/PowerShell/profile.ps1": powerExtraText,
             "~/Documents/WindowsPowerShell/profile.ps1": powerExtraText,
+            [path.join(installationDirectory, "etc", "profile.d", "conda.sh")]: bashExtraText,
+            [path.join(installationDirectory, "etc", "fish", "conf.d", "conda.fish")]: bashExtraText,
+            [path.join(installationDirectory, "condabin", "conda_hook.bat")]: batchExtraText,
         };
-        if (options.useBundled) {
-            extraShells = {
-                "C:/Miniconda/etc/profile.d/conda.sh": bashExtraText,
-                "C:/Miniconda/etc/fish/conf.d/conda.fish": bashExtraText,
-                "C:/Miniconda/condabin/conda_hook.bat": batchExtraText,
-            };
-        }
-        else {
-            extraShells = {
-                "~/miniconda3/etc/profile.d/conda.sh": bashExtraText,
-                "~/miniconda3/etc/fish/conf.d/conda.fish": bashExtraText,
-                "~/miniconda3/condabin/conda_hook.bat": batchExtraText,
-            };
-        }
-        const allShells = Object.assign(Object.assign({}, shells), extraShells);
-        Object.keys(allShells).forEach((key) => {
+        Object.keys(shells).forEach((key) => {
             let filePath = key.replace("~", os.homedir());
-            const text = allShells[key];
+            const text = shells[key];
             if (fs.existsSync(filePath)) {
                 core.info(`Append to "${filePath}":\n ${text} \n`);
                 fs.appendFileSync(filePath, text);
@@ -47795,7 +47637,7 @@ const RULES = [
     (i, c) => !!(i.condaVersion && c.auto_update_conda === "true") &&
         `only one of 'conda-version: ${i.condaVersion}' or 'auto-update-conda: true' may be provided`,
     (i) => !!(i.pythonVersion && !i.activateEnvironment) &&
-        `'python-version: ${i.pythonVersion}' requires 'activate-environment: true'`,
+        `'python-version: ${i.pythonVersion}' requires 'activate-environment' to be set`,
     (i) => !!(i.minicondaVersion && i.miniforgeVersion) &&
         `only one of 'miniconda-version: ${i.minicondaVersion}' or 'miniforge-version: ${i.miniforgeVersion}' may be provided`,
     (i) => !!(i.installerUrl && i.minicondaVersion) &&
@@ -47821,6 +47663,9 @@ function parseInputs() {
             // https://github.com/conda-incubator/setup-miniconda/issues/385
             arch = "aarch64";
         }
+        if (core.getInput("auto-activate-base") !== "legacy-placeholder") {
+            core.warning("`auto-activate-base` is deprecated. Please use `auto-activate`.");
+        }
         const inputs = Object.freeze({
             activateEnvironment: core.getInput("activate-environment"),
             architecture: arch,
@@ -47842,11 +47687,14 @@ function parseInputs() {
                 add_anaconda_token: core.getInput("add-anaconda-token"),
                 add_pip_as_python_dependency: core.getInput("add-pip-as-python-dependency"),
                 allow_softlinks: core.getInput("allow-softlinks"),
-                auto_activate_base: core.getInput("auto-activate-base"),
+                auto_activate: core.getInput("auto-activate-base") === "legacy-placeholder"
+                    ? core.getInput("auto-activate")
+                    : core.getInput("auto-activate-base"),
                 auto_update_conda: core.getInput("auto-update-conda"),
                 channel_alias: core.getInput("channel-alias"),
                 channel_priority: core.getInput("channel-priority"),
                 channels: core.getInput("channels"),
+                default_activation_env: "", // Needed for type definition
                 show_channel_urls: core.getInput("show-channel-urls"),
                 use_only_tar_bz2: core.getInput("use-only-tar-bz2"),
                 solver: core.getInput("conda-solver"),
@@ -48888,14 +48736,6 @@ module.exports = require("net");
 
 /***/ }),
 
-/***/ 6005:
-/***/ ((module) => {
-
-"use strict";
-module.exports = require("node:crypto");
-
-/***/ }),
-
 /***/ 5673:
 /***/ ((module) => {
 

From 0a57839a708f7c2fff259cfd1ad96e6548e2cba0 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 10:34:54 -0700
Subject: [PATCH 06/16] Add tests

---
 .github/workflows/example-16.yml              | 126 ++++++++++++++++++
 .../default-environment/construct.yaml        |  20 +++
 2 files changed, 146 insertions(+)
 create mode 100644 .github/workflows/example-16.yml
 create mode 100644 etc/example-installers/default-environment/construct.yaml

diff --git a/.github/workflows/example-16.yml b/.github/workflows/example-16.yml
new file mode 100644
index 00000000..a4bf1ed1
--- /dev/null
+++ b/.github/workflows/example-16.yml
@@ -0,0 +1,126 @@
+name: "Example 16: Default environment activation"
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - default-env-condarc-test
+  schedule:
+    # Note that cronjobs run on master/main by default
+    - cron: "0 0 * * *"
+
+jobs:
+  example-16:
+    # prevent cronjobs from running on forks
+    if:
+      (github.event_name == 'schedule' && github.repository ==
+      'conda-incubator/setup-miniconda') || (github.event_name != 'schedule')
+    name:
+      Ex16 (os=${{matrix.os}}, default env=${{ matrix.add-activation-env ==
+      'true' && 'default' || 'base' }})
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        add-activation-env: ["false", "true"]
+        os: ["ubuntu", "windows"]
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+
+      - name: Download micromamba to create installer
+        uses: mamba-org/setup-micromamba@7f29b8b80078b1b601dfa018b0f7425c587c63bb # v2.0.6
+        with:
+          init-shell: none
+          micromamba-version: "latest"
+
+      - name: Set up Miniconda for installer builds
+        uses: ./
+        with:
+          activate-environment: ""
+          auto-activate: false
+
+      - name: Create installer
+        uses: conda-incubator/installer@2d2df0b03c6795f70e128c56403c7d084cca4fb8 # v0.1.0
+        id: create-installer
+        with:
+          conda-root: ${{ env.CONDA }}
+          environment-yaml-string: |
+            channels:
+              - conda-forge
+            dependencies:
+              - constructor
+            variables:
+              ADD_ACTIVATION_ENV: '${{ matrix.add-activation-env }}'
+              EXT: ${{ matrix.os == 'windows' && 'exe' || 'sh' }}
+          input-directory: etc/example-installers/default-environment/
+
+      - name: Determine installer file name
+        id: installer-file
+        env:
+          ARTIFACTS_DIRECTORY:
+            ${{ steps.create-installer.outputs.artifacts-directory }}
+          EXT: ${{ matrix.os == 'windows' && 'exe' || 'sh' }}
+        run: |
+          INSTALLER_FILE=$(find "${ARTIFACTS_DIRECTORY}" -name "*.${EXT}" | head -n 1)
+          echo "installer-file=${INSTALLER_FILE}" >> ${GITHUB_OUTPUT}
+        shell: bash
+
+      - name: Run installation
+        uses: ./
+        with:
+          activate-environment: ""
+          auto-activate: true
+          installation-dir: ${{ runner.temp }}/installer_test
+          installer-url:
+            file://${{ steps.installer-file.outputs.installer-file }}
+
+      - name: Output conda info (bash)
+        env:
+          DEFAULT_ENV: ${{ matrix.add-activation-env && 'default' || 'base' }}
+          TEST_DIR: ${{ runner.temp }}/installer_output
+        run: |
+          mkdir -p ${TEST_DIR}
+          conda info --json > "${TEST_DIR}/bash.json"
+        shell: bash -el {0}
+
+      - name: Output conda info (cmd.exe)
+        if: matrix.os == 'windows'
+        env:
+          TEST_DIR: ${{ runner.temp }}\installer_output
+        run: |
+          type %CONDA%\condabin\conda_hook.bat
+          conda info --json > "%TEST_DIR%\cmd.exe.json"
+        shell: cmd /C CALL {0}
+
+      - name: Output conda info (PowerShell)
+        if: matrix.os == 'windows'
+        env:
+          TEST_DIR: ${{ runner.temp }}\installer_output
+        run: conda info --json > "${env:TEST_DIR}\pwsh.json"
+        shell: pwsh
+
+      - name: Test default environments
+        env:
+          DEFAULT_ENV:
+            ${{ matrix.add-activation-env == 'true' && 'default' || 'base' }}
+          TEST_DIR: ${{ runner.temp }}/installer_output
+        run: |
+          import json
+          import os
+          from pathlib import Path
+          json_dir = Path(os.environ["TEST_DIR"])
+          default_env_expected = os.environ["DEFAULT_ENV"]
+          incorrect_environments = {}
+          for file in json_dir.iterdir():
+              conda_info = json.loads(file.read_text())
+              default_env = conda_info.get("active_prefix_name")
+              if default_env != default_env_expected:
+                incorrect_environments[str(file.name).removesuffix(".json")] = default_env
+          if incorrect_environments:
+              raise AssertionError(
+                  f"Found incorrect default environments: {incorrect_environments}"
+              )
+        shell: python
diff --git a/etc/example-installers/default-environment/construct.yaml b/etc/example-installers/default-environment/construct.yaml
new file mode 100644
index 00000000..c1c8feed
--- /dev/null
+++ b/etc/example-installers/default-environment/construct.yaml
@@ -0,0 +1,20 @@
+{% set ext = os.environ.get("EXT", "sh") %}
+{% set add_default_activation_env = os.environ.get("ADD_ACTIVATION_ENV", "false") == "true" %}
+
+name: DefaultEnv
+installer_type: {{ ext }}
+version: 1.0.0
+channels:
+  - conda-forge
+specs:
+  - conda >=25.5.0
+extra_envs:
+  default:
+    specs:
+      - python
+condarc:
+  channels:
+    - conda-forge
+{% if add_default_activation_env %}
+  default_activation_env: default
+{% endif %}

From 3c6183673b402d98ea2c5f4b791cb8bc04abfc53 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 11:49:07 -0700
Subject: [PATCH 07/16] Fix base environment logic in isDefaultEnvironment

---
 dist/setup/index.js | 2 +-
 src/conda.ts        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/dist/setup/index.js b/dist/setup/index.js
index 78995264..356e863a 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -46858,7 +46858,7 @@ function isDefaultEnvironment(envName, inputs, options) {
         if (config.default_activation_env) {
             return config.default_activation_env === envName;
         }
-        return !utils.isBaseEnv(envName);
+        return utils.isBaseEnv(envName);
     });
 }
 /**
diff --git a/src/conda.ts b/src/conda.ts
index ed9a0c2f..4433fca2 100644
--- a/src/conda.ts
+++ b/src/conda.ts
@@ -311,7 +311,7 @@ async function isDefaultEnvironment(
   if (config.default_activation_env) {
     return config.default_activation_env === envName;
   }
-  return !utils.isBaseEnv(envName);
+  return utils.isBaseEnv(envName);
 }
 
 /**

From ceaac85e2fffa9c3cf212f4c73ebb525b3946055 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 13:05:21 -0700
Subject: [PATCH 08/16] Update README

---
 README.md | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 3d03620d..2c553a54 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,7 @@ possibility of automatically activating the `test` environment on all shells.
 | [Apple Silicon](#example-13-apple-silicon)                         | [![Apple Silicon][ex13-badge]][ex13]                            |
 | [Remove defaults](#example-14-remove-defaults-channel)             | [![Remove defaults][ex14-badge]][ex14]                          |
 | [Linux ARM](#example-15-linux-arm)                                 | [![Linux ARM][ex15-badge]][ex15]                                |
+| Default environments                                               | [![Default environments][ex16-badge]][ex16]                     |
 
 [ex1]:
   https://github.com/conda-incubator/setup-miniconda/actions/workflows/example-1.yml
@@ -122,6 +123,10 @@ possibility of automatically activating the `test` environment on all shells.
   https://github.com/conda-incubator/setup-miniconda/actions/workflows/example-15.yml
 [ex15-badge]:
   https://github.com/conda-incubator/setup-miniconda/actions/workflows/example-15.yml/badge.svg?branch=main
+[ex16]:
+  https://github.com/conda-incubator/setup-miniconda/actions/workflows/example-16.yml
+[ex16-badge]:
+  https://github.com/conda-incubator/setup-miniconda/actions/workflows/example-16.yml/badge.svg?branch=main
 
 ## Other Workflows
 
@@ -180,16 +185,16 @@ Miniconda installation.
 
 ### Activate `base` environment
 
-If your specific workflow still needs to activate and use `base` you will need
-to do **both** of:
+If your specific workflow still needs to activate and use the default environment,
+you will need to do **both**:
 
 - set `activate-environment` to an empty string
-- set `auto-activate-base` to `true`
+- set `auto-activate` to `true`
 
 ```yaml
 - uses: conda-incubator/setup-miniconda@v3
   with:
-    auto-activate-base: true
+    auto-activate: true
     activate-environment: ""
 ```
 
@@ -330,7 +335,7 @@ jobs:
           environment-file: etc/example-environment.yml
           python-version: 3.5
           condarc-file: etc/example-condarc.yml
-          auto-activate-base: false
+          auto-activate: false
       - run: |
           conda info
           conda list

From 9fa1af92ded505b48598aab9c21abeb1243668f4 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 13:06:42 -0700
Subject: [PATCH 09/16] Provide alternative option to auto-activate-base in
 action description

---
 README.md  | 4 ++--
 action.yml | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 2c553a54..e0c98830 100644
--- a/README.md
+++ b/README.md
@@ -185,8 +185,8 @@ Miniconda installation.
 
 ### Activate `base` environment
 
-If your specific workflow still needs to activate and use the default environment,
-you will need to do **both**:
+If your specific workflow still needs to activate and use the default
+environment, you will need to do **both**:
 
 - set `activate-environment` to an empty string
 - set `auto-activate` to `true`
diff --git a/action.yml b/action.yml
index 8d93d869..658cc021 100644
--- a/action.yml
+++ b/action.yml
@@ -146,7 +146,8 @@ inputs:
     default: "true"
   auto-activate-base:
     description:
-      (deprecated) 'Conda configuration. If you’d prefer that conda’s base
+      (deprecated in favor of `auto-activate`)
+      'Conda configuration. If you’d prefer that conda’s base
       environment not be activated on startup, set the to "false". Default is
       "true". This setting always overrides if set to "true" or "false". If you
       want to use the "condarc-file" setting pass an empty string. See

From 16f4dcf63e8ef10c1dd617b96d125c3d51d737ba Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 13:07:02 -0700
Subject: [PATCH 10/16] Lint

---
 action.yml | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/action.yml b/action.yml
index 658cc021..808553d0 100644
--- a/action.yml
+++ b/action.yml
@@ -146,11 +146,11 @@ inputs:
     default: "true"
   auto-activate-base:
     description:
-      (deprecated in favor of `auto-activate`)
-      'Conda configuration. If you’d prefer that conda’s base
-      environment not be activated on startup, set the to "false". Default is
-      "true". This setting always overrides if set to "true" or "false". If you
-      want to use the "condarc-file" setting pass an empty string. See
+      (deprecated in favor of `auto-activate`) 'Conda configuration. If you’d
+      prefer that conda’s base environment not be activated on startup, set the
+      to "false". Default is "true". This setting always overrides if set to
+      "true" or "false". If you want to use the "condarc-file" setting pass an
+      empty string. See
       https://docs.conda.io/projects/conda/en/latest/user-guide/configuration/
       for more information.'
     required: false

From a5ddb7b545da5774d798f16aca28ca56dcb9686a Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 13:11:54 -0700
Subject: [PATCH 11/16] Remove debug branch from example-16

---
 .github/workflows/example-16.yml | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.github/workflows/example-16.yml b/.github/workflows/example-16.yml
index a4bf1ed1..f9f7e4fc 100644
--- a/.github/workflows/example-16.yml
+++ b/.github/workflows/example-16.yml
@@ -5,7 +5,6 @@ on:
   push:
     branches:
       - main
-      - default-env-condarc-test
   schedule:
     # Note that cronjobs run on master/main by default
     - cron: "0 0 * * *"

From 0603ed67f57b6e158ed4a471a46fd4315131b250 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 10 Sep 2025 13:32:33 -0700
Subject: [PATCH 12/16] Rebuild JS

---
 dist/delete/index.js | 269 ++++++++++++++++++++++++++++++++++---------
 dist/setup/index.js  | 269 ++++++++++++++++++++++++++++++++++---------
 2 files changed, 432 insertions(+), 106 deletions(-)

diff --git a/dist/delete/index.js b/dist/delete/index.js
index bccaff88..2e1d0d9c 100644
--- a/dist/delete/index.js
+++ b/dist/delete/index.js
@@ -3189,6 +3189,9 @@ function copyFile(srcFile, destFile, force) {
 /***/ 1532:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const ANY = Symbol('SemVer ANY')
 // hoisted class for cyclic dependency
 class Comparator {
@@ -3337,6 +3340,9 @@ const Range = __nccwpck_require__(9828)
 /***/ 9828:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SPACE_CHARACTERS = /\s+/g
 
 // hoisted class for cyclic dependency
@@ -3898,6 +3904,9 @@ const testSet = (set, version, options) => {
 /***/ 8088:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const debug = __nccwpck_require__(427)
 const { MAX_LENGTH, MAX_SAFE_INTEGER } = __nccwpck_require__(2293)
 const { safeRe: re, t } = __nccwpck_require__(9523)
@@ -3910,7 +3919,7 @@ class SemVer {
 
     if (version instanceof SemVer) {
       if (version.loose === !!options.loose &&
-          version.includePrerelease === !!options.includePrerelease) {
+        version.includePrerelease === !!options.includePrerelease) {
         return version
       } else {
         version = version.version
@@ -4076,6 +4085,19 @@ class SemVer {
   // preminor will bump the version up to the next minor release, and immediately
   // down to pre-release. premajor and prepatch work the same way.
   inc (release, identifier, identifierBase) {
+    if (release.startsWith('pre')) {
+      if (!identifier && identifierBase === false) {
+        throw new Error('invalid increment argument: identifier is empty')
+      }
+      // Avoid an invalid semver results
+      if (identifier) {
+        const match = `-${identifier}`.match(this.options.loose ? re[t.PRERELEASELOOSE] : re[t.PRERELEASE])
+        if (!match || match[1] !== identifier) {
+          throw new Error(`invalid identifier: ${identifier}`)
+        }
+      }
+    }
+
     switch (release) {
       case 'premajor':
         this.prerelease.length = 0
@@ -4106,6 +4128,12 @@ class SemVer {
         }
         this.inc('pre', identifier, identifierBase)
         break
+      case 'release':
+        if (this.prerelease.length === 0) {
+          throw new Error(`version ${this.raw} is not a prerelease`)
+        }
+        this.prerelease.length = 0
+        break
 
       case 'major':
         // If this is a pre-major version, bump up to the same major version.
@@ -4149,10 +4177,6 @@ class SemVer {
       case 'pre': {
         const base = Number(identifierBase) ? 1 : 0
 
-        if (!identifier && identifierBase === false) {
-          throw new Error('invalid increment argument: identifier is empty')
-        }
-
         if (this.prerelease.length === 0) {
           this.prerelease = [base]
         } else {
@@ -4207,6 +4231,9 @@ module.exports = SemVer
 /***/ 8848:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const parse = __nccwpck_require__(5925)
 const clean = (version, options) => {
   const s = parse(version.trim().replace(/^[=v]+/, ''), options)
@@ -4220,6 +4247,9 @@ module.exports = clean
 /***/ 5098:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const eq = __nccwpck_require__(1898)
 const neq = __nccwpck_require__(6017)
 const gt = __nccwpck_require__(4123)
@@ -4279,6 +4309,9 @@ module.exports = cmp
 /***/ 3466:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const parse = __nccwpck_require__(5925)
 const { safeRe: re, t } = __nccwpck_require__(9523)
@@ -4346,6 +4379,9 @@ module.exports = coerce
 /***/ 2156:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const compareBuild = (a, b, loose) => {
   const versionA = new SemVer(a, loose)
@@ -4360,6 +4396,9 @@ module.exports = compareBuild
 /***/ 2804:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const compareLoose = (a, b) => compare(a, b, true)
 module.exports = compareLoose
@@ -4370,6 +4409,9 @@ module.exports = compareLoose
 /***/ 4309:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const compare = (a, b, loose) =>
   new SemVer(a, loose).compare(new SemVer(b, loose))
@@ -4382,6 +4424,9 @@ module.exports = compare
 /***/ 4297:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const parse = __nccwpck_require__(5925)
 
 const diff = (version1, version2) => {
@@ -4411,20 +4456,13 @@ const diff = (version1, version2) => {
       return 'major'
     }
 
-    // Otherwise it can be determined by checking the high version
-
-    if (highVersion.patch) {
-      // anything higher than a patch bump would result in the wrong version
+    // If the main part has no difference
+    if (lowVersion.compareMain(highVersion) === 0) {
+      if (lowVersion.minor && !lowVersion.patch) {
+        return 'minor'
+      }
       return 'patch'
     }
-
-    if (highVersion.minor) {
-      // anything higher than a minor bump would result in the wrong version
-      return 'minor'
-    }
-
-    // bumping major/minor/patch all have same result
-    return 'major'
   }
 
   // add the `pre` prefix if we are going to a prerelease version
@@ -4454,6 +4492,9 @@ module.exports = diff
 /***/ 1898:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const eq = (a, b, loose) => compare(a, b, loose) === 0
 module.exports = eq
@@ -4464,6 +4505,9 @@ module.exports = eq
 /***/ 4123:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const gt = (a, b, loose) => compare(a, b, loose) > 0
 module.exports = gt
@@ -4474,6 +4518,9 @@ module.exports = gt
 /***/ 5522:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const gte = (a, b, loose) => compare(a, b, loose) >= 0
 module.exports = gte
@@ -4484,6 +4531,9 @@ module.exports = gte
 /***/ 900:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 
 const inc = (version, release, options, identifier, identifierBase) => {
@@ -4510,6 +4560,9 @@ module.exports = inc
 /***/ 194:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const lt = (a, b, loose) => compare(a, b, loose) < 0
 module.exports = lt
@@ -4520,6 +4573,9 @@ module.exports = lt
 /***/ 7520:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const lte = (a, b, loose) => compare(a, b, loose) <= 0
 module.exports = lte
@@ -4530,6 +4586,9 @@ module.exports = lte
 /***/ 6688:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const major = (a, loose) => new SemVer(a, loose).major
 module.exports = major
@@ -4540,6 +4599,9 @@ module.exports = major
 /***/ 8447:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const minor = (a, loose) => new SemVer(a, loose).minor
 module.exports = minor
@@ -4550,6 +4612,9 @@ module.exports = minor
 /***/ 6017:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const neq = (a, b, loose) => compare(a, b, loose) !== 0
 module.exports = neq
@@ -4560,6 +4625,9 @@ module.exports = neq
 /***/ 5925:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const parse = (version, options, throwErrors = false) => {
   if (version instanceof SemVer) {
@@ -4583,6 +4651,9 @@ module.exports = parse
 /***/ 2866:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const patch = (a, loose) => new SemVer(a, loose).patch
 module.exports = patch
@@ -4593,6 +4664,9 @@ module.exports = patch
 /***/ 4016:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const parse = __nccwpck_require__(5925)
 const prerelease = (version, options) => {
   const parsed = parse(version, options)
@@ -4606,6 +4680,9 @@ module.exports = prerelease
 /***/ 6417:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const rcompare = (a, b, loose) => compare(b, a, loose)
 module.exports = rcompare
@@ -4616,6 +4693,9 @@ module.exports = rcompare
 /***/ 8701:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compareBuild = __nccwpck_require__(2156)
 const rsort = (list, loose) => list.sort((a, b) => compareBuild(b, a, loose))
 module.exports = rsort
@@ -4626,6 +4706,9 @@ module.exports = rsort
 /***/ 6055:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 const satisfies = (version, range, options) => {
   try {
@@ -4643,6 +4726,9 @@ module.exports = satisfies
 /***/ 1426:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compareBuild = __nccwpck_require__(2156)
 const sort = (list, loose) => list.sort((a, b) => compareBuild(a, b, loose))
 module.exports = sort
@@ -4653,6 +4739,9 @@ module.exports = sort
 /***/ 9601:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const parse = __nccwpck_require__(5925)
 const valid = (version, options) => {
   const v = parse(version, options)
@@ -4666,6 +4755,9 @@ module.exports = valid
 /***/ 1383:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 // just pre-load all the stuff that index.js lazily exports
 const internalRe = __nccwpck_require__(9523)
 const constants = __nccwpck_require__(2293)
@@ -4762,6 +4854,9 @@ module.exports = {
 /***/ 2293:
 /***/ ((module) => {
 
+"use strict";
+
+
 // Note: this is the semver.org version of the spec that it implements
 // Not necessarily the package version of this code.
 const SEMVER_SPEC_VERSION = '2.0.0'
@@ -4804,6 +4899,9 @@ module.exports = {
 /***/ 427:
 /***/ ((module) => {
 
+"use strict";
+
+
 const debug = (
   typeof process === 'object' &&
   process.env &&
@@ -4820,6 +4918,9 @@ module.exports = debug
 /***/ 2463:
 /***/ ((module) => {
 
+"use strict";
+
+
 const numeric = /^[0-9]+$/
 const compareIdentifiers = (a, b) => {
   const anum = numeric.test(a)
@@ -4850,6 +4951,9 @@ module.exports = {
 /***/ 5339:
 /***/ ((module) => {
 
+"use strict";
+
+
 class LRUCache {
   constructor () {
     this.max = 1000
@@ -4897,6 +5001,9 @@ module.exports = LRUCache
 /***/ 785:
 /***/ ((module) => {
 
+"use strict";
+
+
 // parse out just the options we care about
 const looseOption = Object.freeze({ loose: true })
 const emptyOpts = Object.freeze({ })
@@ -4919,6 +5026,9 @@ module.exports = parseOptions
 /***/ 9523:
 /***/ ((module, exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const {
   MAX_SAFE_COMPONENT_LENGTH,
   MAX_SAFE_BUILD_LENGTH,
@@ -4931,6 +5041,7 @@ exports = module.exports = {}
 const re = exports.re = []
 const safeRe = exports.safeRe = []
 const src = exports.src = []
+const safeSrc = exports.safeSrc = []
 const t = exports.t = {}
 let R = 0
 
@@ -4963,6 +5074,7 @@ const createToken = (name, value, isGlobal) => {
   debug(name, index, value)
   t[name] = index
   src[index] = value
+  safeSrc[index] = safe
   re[index] = new RegExp(value, isGlobal ? 'g' : undefined)
   safeRe[index] = new RegExp(safe, isGlobal ? 'g' : undefined)
 }
@@ -4995,12 +5107,14 @@ createToken('MAINVERSIONLOOSE', `(${src[t.NUMERICIDENTIFIERLOOSE]})\\.` +
 
 // ## Pre-release Version Identifier
 // A numeric identifier, or a non-numeric identifier.
+// Non-numberic identifiers include numberic identifiers but can be longer.
+// Therefore non-numberic identifiers must go first.
 
-createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NUMERICIDENTIFIER]
-}|${src[t.NONNUMERICIDENTIFIER]})`)
+createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NONNUMERICIDENTIFIER]
+}|${src[t.NUMERICIDENTIFIER]})`)
 
-createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NUMERICIDENTIFIERLOOSE]
-}|${src[t.NONNUMERICIDENTIFIER]})`)
+createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NONNUMERICIDENTIFIER]
+}|${src[t.NUMERICIDENTIFIERLOOSE]})`)
 
 // ## Pre-release Version
 // Hyphen, followed by one or more dot-separated pre-release version
@@ -5143,6 +5257,9 @@ createToken('GTE0PRE', '^\\s*>=\\s*0\\.0\\.0-0\\s*$')
 /***/ 9380:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 // Determine if version is greater than all the versions possible in the range.
 const outside = __nccwpck_require__(420)
 const gtr = (version, range, options) => outside(version, range, '>', options)
@@ -5154,6 +5271,9 @@ module.exports = gtr
 /***/ 7008:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 const intersects = (r1, r2, options) => {
   r1 = new Range(r1, options)
@@ -5168,6 +5288,9 @@ module.exports = intersects
 /***/ 3323:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const outside = __nccwpck_require__(420)
 // Determine if version is less than all the versions possible in the range
 const ltr = (version, range, options) => outside(version, range, '<', options)
@@ -5179,6 +5302,9 @@ module.exports = ltr
 /***/ 579:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 
@@ -5211,6 +5337,9 @@ module.exports = maxSatisfying
 /***/ 832:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 const minSatisfying = (versions, range, options) => {
@@ -5242,6 +5371,9 @@ module.exports = minSatisfying
 /***/ 4179:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 const gt = __nccwpck_require__(4123)
@@ -5310,6 +5442,9 @@ module.exports = minVersion
 /***/ 420:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const Comparator = __nccwpck_require__(1532)
 const { ANY } = Comparator
@@ -5397,6 +5532,9 @@ module.exports = outside
 /***/ 5297:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 // given a set of versions and a range, create a "simplified" range
 // that includes the same versions that the original range does
 // If the original range is shorter than the simplified one, return that.
@@ -5451,6 +5589,9 @@ module.exports = (versions, range, options) => {
 /***/ 7863:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 const Comparator = __nccwpck_require__(1532)
 const { ANY } = Comparator
@@ -5705,6 +5846,9 @@ module.exports = subset
 /***/ 2706:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 
 // Mostly just for testing and legacy API reasons
@@ -5720,6 +5864,9 @@ module.exports = toComparators
 /***/ 2098:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 const validRange = (range, options) => {
   try {
@@ -11343,7 +11490,7 @@ module.exports = {
 
 
 const { parseSetCookie } = __nccwpck_require__(4408)
-const { stringify, getHeadersList } = __nccwpck_require__(3121)
+const { stringify } = __nccwpck_require__(3121)
 const { webidl } = __nccwpck_require__(1744)
 const { Headers } = __nccwpck_require__(554)
 
@@ -11419,14 +11566,13 @@ function getSetCookies (headers) {
 
   webidl.brandCheck(headers, Headers, { strict: false })
 
-  const cookies = getHeadersList(headers).cookies
+  const cookies = headers.getSetCookie()
 
   if (!cookies) {
     return []
   }
 
-  // In older versions of undici, cookies is a list of name:value.
-  return cookies.map((pair) => parseSetCookie(Array.isArray(pair) ? pair[1] : pair))
+  return cookies.map((pair) => parseSetCookie(pair))
 }
 
 /**
@@ -11854,14 +12000,15 @@ module.exports = {
 /***/ }),
 
 /***/ 3121:
-/***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
+/***/ ((module) => {
 
 "use strict";
 
 
-const assert = __nccwpck_require__(9491)
-const { kHeadersList } = __nccwpck_require__(2785)
-
+/**
+ * @param {string} value
+ * @returns {boolean}
+ */
 function isCTLExcludingHtab (value) {
   if (value.length === 0) {
     return false
@@ -12122,31 +12269,13 @@ function stringify (cookie) {
   return out.join('; ')
 }
 
-let kHeadersListNode
-
-function getHeadersList (headers) {
-  if (headers[kHeadersList]) {
-    return headers[kHeadersList]
-  }
-
-  if (!kHeadersListNode) {
-    kHeadersListNode = Object.getOwnPropertySymbols(headers).find(
-      (symbol) => symbol.description === 'headers list'
-    )
-
-    assert(kHeadersListNode, 'Headers cannot be parsed')
-  }
-
-  const headersList = headers[kHeadersListNode]
-  assert(headersList)
-
-  return headersList
-}
-
 module.exports = {
   isCTLExcludingHtab,
-  stringify,
-  getHeadersList
+  validateCookieName,
+  validateCookiePath,
+  validateCookieValue,
+  toIMFDate,
+  stringify
 }
 
 
@@ -14075,6 +14204,14 @@ const { isUint8Array, isArrayBuffer } = __nccwpck_require__(9830)
 const { File: UndiciFile } = __nccwpck_require__(8511)
 const { parseMIMEType, serializeAMimeType } = __nccwpck_require__(685)
 
+let random
+try {
+  const crypto = __nccwpck_require__(6005)
+  random = (max) => crypto.randomInt(0, max)
+} catch {
+  random = (max) => Math.floor(Math.random(max))
+}
+
 let ReadableStream = globalThis.ReadableStream
 
 /** @type {globalThis['File']} */
@@ -14160,7 +14297,7 @@ function extractBody (object, keepalive = false) {
     // Set source to a copy of the bytes held by object.
     source = new Uint8Array(object.buffer.slice(object.byteOffset, object.byteOffset + object.byteLength))
   } else if (util.isFormDataLike(object)) {
-    const boundary = `----formdata-undici-0${`${Math.floor(Math.random() * 1e11)}`.padStart(11, '0')}`
+    const boundary = `----formdata-undici-0${`${random(1e11)}`.padStart(11, '0')}`
     const prefix = `--${boundary}\r\nContent-Disposition: form-data`
 
     /*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
@@ -16142,6 +16279,7 @@ const {
   isValidHeaderName,
   isValidHeaderValue
 } = __nccwpck_require__(2538)
+const util = __nccwpck_require__(3837)
 const { webidl } = __nccwpck_require__(1744)
 const assert = __nccwpck_require__(9491)
 
@@ -16695,6 +16833,9 @@ Object.defineProperties(Headers.prototype, {
   [Symbol.toStringTag]: {
     value: 'Headers',
     configurable: true
+  },
+  [util.inspect.custom]: {
+    enumerable: false
   }
 })
 
@@ -25871,6 +26012,20 @@ class Pool extends PoolBase {
       ? { ...options.interceptors }
       : undefined
     this[kFactory] = factory
+
+    this.on('connectionError', (origin, targets, error) => {
+      // If a connection error occurs, we remove the client from the pool,
+      // and emit a connectionError event. They will not be re-used.
+      // Fixes https://github.com/nodejs/undici/issues/3895
+      for (const target of targets) {
+        // Do not use kRemoveClient here, as it will close the client,
+        // but the client cannot be closed in this state.
+        const idx = this[kClients].indexOf(target)
+        if (idx !== -1) {
+          this[kClients].splice(idx, 1)
+        }
+      }
+    })
   }
 
   [kGetDispatcher] () {
@@ -28848,6 +29003,14 @@ module.exports = require("net");
 
 /***/ }),
 
+/***/ 6005:
+/***/ ((module) => {
+
+"use strict";
+module.exports = require("node:crypto");
+
+/***/ }),
+
 /***/ 5673:
 /***/ ((module) => {
 
diff --git a/dist/setup/index.js b/dist/setup/index.js
index 356e863a..c4db5eb1 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -21201,6 +21201,9 @@ exports.parse = parse;
 /***/ 1532:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const ANY = Symbol('SemVer ANY')
 // hoisted class for cyclic dependency
 class Comparator {
@@ -21349,6 +21352,9 @@ const Range = __nccwpck_require__(9828)
 /***/ 9828:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SPACE_CHARACTERS = /\s+/g
 
 // hoisted class for cyclic dependency
@@ -21910,6 +21916,9 @@ const testSet = (set, version, options) => {
 /***/ 8088:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const debug = __nccwpck_require__(427)
 const { MAX_LENGTH, MAX_SAFE_INTEGER } = __nccwpck_require__(2293)
 const { safeRe: re, t } = __nccwpck_require__(9523)
@@ -21922,7 +21931,7 @@ class SemVer {
 
     if (version instanceof SemVer) {
       if (version.loose === !!options.loose &&
-          version.includePrerelease === !!options.includePrerelease) {
+        version.includePrerelease === !!options.includePrerelease) {
         return version
       } else {
         version = version.version
@@ -22088,6 +22097,19 @@ class SemVer {
   // preminor will bump the version up to the next minor release, and immediately
   // down to pre-release. premajor and prepatch work the same way.
   inc (release, identifier, identifierBase) {
+    if (release.startsWith('pre')) {
+      if (!identifier && identifierBase === false) {
+        throw new Error('invalid increment argument: identifier is empty')
+      }
+      // Avoid an invalid semver results
+      if (identifier) {
+        const match = `-${identifier}`.match(this.options.loose ? re[t.PRERELEASELOOSE] : re[t.PRERELEASE])
+        if (!match || match[1] !== identifier) {
+          throw new Error(`invalid identifier: ${identifier}`)
+        }
+      }
+    }
+
     switch (release) {
       case 'premajor':
         this.prerelease.length = 0
@@ -22118,6 +22140,12 @@ class SemVer {
         }
         this.inc('pre', identifier, identifierBase)
         break
+      case 'release':
+        if (this.prerelease.length === 0) {
+          throw new Error(`version ${this.raw} is not a prerelease`)
+        }
+        this.prerelease.length = 0
+        break
 
       case 'major':
         // If this is a pre-major version, bump up to the same major version.
@@ -22161,10 +22189,6 @@ class SemVer {
       case 'pre': {
         const base = Number(identifierBase) ? 1 : 0
 
-        if (!identifier && identifierBase === false) {
-          throw new Error('invalid increment argument: identifier is empty')
-        }
-
         if (this.prerelease.length === 0) {
           this.prerelease = [base]
         } else {
@@ -22219,6 +22243,9 @@ module.exports = SemVer
 /***/ 8848:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const parse = __nccwpck_require__(5925)
 const clean = (version, options) => {
   const s = parse(version.trim().replace(/^[=v]+/, ''), options)
@@ -22232,6 +22259,9 @@ module.exports = clean
 /***/ 5098:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const eq = __nccwpck_require__(1898)
 const neq = __nccwpck_require__(6017)
 const gt = __nccwpck_require__(4123)
@@ -22291,6 +22321,9 @@ module.exports = cmp
 /***/ 3466:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const parse = __nccwpck_require__(5925)
 const { safeRe: re, t } = __nccwpck_require__(9523)
@@ -22358,6 +22391,9 @@ module.exports = coerce
 /***/ 2156:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const compareBuild = (a, b, loose) => {
   const versionA = new SemVer(a, loose)
@@ -22372,6 +22408,9 @@ module.exports = compareBuild
 /***/ 2804:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const compareLoose = (a, b) => compare(a, b, true)
 module.exports = compareLoose
@@ -22382,6 +22421,9 @@ module.exports = compareLoose
 /***/ 4309:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const compare = (a, b, loose) =>
   new SemVer(a, loose).compare(new SemVer(b, loose))
@@ -22394,6 +22436,9 @@ module.exports = compare
 /***/ 4297:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const parse = __nccwpck_require__(5925)
 
 const diff = (version1, version2) => {
@@ -22423,20 +22468,13 @@ const diff = (version1, version2) => {
       return 'major'
     }
 
-    // Otherwise it can be determined by checking the high version
-
-    if (highVersion.patch) {
-      // anything higher than a patch bump would result in the wrong version
+    // If the main part has no difference
+    if (lowVersion.compareMain(highVersion) === 0) {
+      if (lowVersion.minor && !lowVersion.patch) {
+        return 'minor'
+      }
       return 'patch'
     }
-
-    if (highVersion.minor) {
-      // anything higher than a minor bump would result in the wrong version
-      return 'minor'
-    }
-
-    // bumping major/minor/patch all have same result
-    return 'major'
   }
 
   // add the `pre` prefix if we are going to a prerelease version
@@ -22466,6 +22504,9 @@ module.exports = diff
 /***/ 1898:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const eq = (a, b, loose) => compare(a, b, loose) === 0
 module.exports = eq
@@ -22476,6 +22517,9 @@ module.exports = eq
 /***/ 4123:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const gt = (a, b, loose) => compare(a, b, loose) > 0
 module.exports = gt
@@ -22486,6 +22530,9 @@ module.exports = gt
 /***/ 5522:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const gte = (a, b, loose) => compare(a, b, loose) >= 0
 module.exports = gte
@@ -22496,6 +22543,9 @@ module.exports = gte
 /***/ 900:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 
 const inc = (version, release, options, identifier, identifierBase) => {
@@ -22522,6 +22572,9 @@ module.exports = inc
 /***/ 194:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const lt = (a, b, loose) => compare(a, b, loose) < 0
 module.exports = lt
@@ -22532,6 +22585,9 @@ module.exports = lt
 /***/ 7520:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const lte = (a, b, loose) => compare(a, b, loose) <= 0
 module.exports = lte
@@ -22542,6 +22598,9 @@ module.exports = lte
 /***/ 6688:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const major = (a, loose) => new SemVer(a, loose).major
 module.exports = major
@@ -22552,6 +22611,9 @@ module.exports = major
 /***/ 8447:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const minor = (a, loose) => new SemVer(a, loose).minor
 module.exports = minor
@@ -22562,6 +22624,9 @@ module.exports = minor
 /***/ 6017:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const neq = (a, b, loose) => compare(a, b, loose) !== 0
 module.exports = neq
@@ -22572,6 +22637,9 @@ module.exports = neq
 /***/ 5925:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const parse = (version, options, throwErrors = false) => {
   if (version instanceof SemVer) {
@@ -22595,6 +22663,9 @@ module.exports = parse
 /***/ 2866:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const patch = (a, loose) => new SemVer(a, loose).patch
 module.exports = patch
@@ -22605,6 +22676,9 @@ module.exports = patch
 /***/ 4016:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const parse = __nccwpck_require__(5925)
 const prerelease = (version, options) => {
   const parsed = parse(version, options)
@@ -22618,6 +22692,9 @@ module.exports = prerelease
 /***/ 6417:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compare = __nccwpck_require__(4309)
 const rcompare = (a, b, loose) => compare(b, a, loose)
 module.exports = rcompare
@@ -22628,6 +22705,9 @@ module.exports = rcompare
 /***/ 8701:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compareBuild = __nccwpck_require__(2156)
 const rsort = (list, loose) => list.sort((a, b) => compareBuild(b, a, loose))
 module.exports = rsort
@@ -22638,6 +22718,9 @@ module.exports = rsort
 /***/ 6055:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 const satisfies = (version, range, options) => {
   try {
@@ -22655,6 +22738,9 @@ module.exports = satisfies
 /***/ 1426:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const compareBuild = __nccwpck_require__(2156)
 const sort = (list, loose) => list.sort((a, b) => compareBuild(a, b, loose))
 module.exports = sort
@@ -22665,6 +22751,9 @@ module.exports = sort
 /***/ 9601:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const parse = __nccwpck_require__(5925)
 const valid = (version, options) => {
   const v = parse(version, options)
@@ -22678,6 +22767,9 @@ module.exports = valid
 /***/ 1383:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 // just pre-load all the stuff that index.js lazily exports
 const internalRe = __nccwpck_require__(9523)
 const constants = __nccwpck_require__(2293)
@@ -22774,6 +22866,9 @@ module.exports = {
 /***/ 2293:
 /***/ ((module) => {
 
+"use strict";
+
+
 // Note: this is the semver.org version of the spec that it implements
 // Not necessarily the package version of this code.
 const SEMVER_SPEC_VERSION = '2.0.0'
@@ -22816,6 +22911,9 @@ module.exports = {
 /***/ 427:
 /***/ ((module) => {
 
+"use strict";
+
+
 const debug = (
   typeof process === 'object' &&
   process.env &&
@@ -22832,6 +22930,9 @@ module.exports = debug
 /***/ 2463:
 /***/ ((module) => {
 
+"use strict";
+
+
 const numeric = /^[0-9]+$/
 const compareIdentifiers = (a, b) => {
   const anum = numeric.test(a)
@@ -22862,6 +22963,9 @@ module.exports = {
 /***/ 5339:
 /***/ ((module) => {
 
+"use strict";
+
+
 class LRUCache {
   constructor () {
     this.max = 1000
@@ -22909,6 +23013,9 @@ module.exports = LRUCache
 /***/ 785:
 /***/ ((module) => {
 
+"use strict";
+
+
 // parse out just the options we care about
 const looseOption = Object.freeze({ loose: true })
 const emptyOpts = Object.freeze({ })
@@ -22931,6 +23038,9 @@ module.exports = parseOptions
 /***/ 9523:
 /***/ ((module, exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const {
   MAX_SAFE_COMPONENT_LENGTH,
   MAX_SAFE_BUILD_LENGTH,
@@ -22943,6 +23053,7 @@ exports = module.exports = {}
 const re = exports.re = []
 const safeRe = exports.safeRe = []
 const src = exports.src = []
+const safeSrc = exports.safeSrc = []
 const t = exports.t = {}
 let R = 0
 
@@ -22975,6 +23086,7 @@ const createToken = (name, value, isGlobal) => {
   debug(name, index, value)
   t[name] = index
   src[index] = value
+  safeSrc[index] = safe
   re[index] = new RegExp(value, isGlobal ? 'g' : undefined)
   safeRe[index] = new RegExp(safe, isGlobal ? 'g' : undefined)
 }
@@ -23007,12 +23119,14 @@ createToken('MAINVERSIONLOOSE', `(${src[t.NUMERICIDENTIFIERLOOSE]})\\.` +
 
 // ## Pre-release Version Identifier
 // A numeric identifier, or a non-numeric identifier.
+// Non-numberic identifiers include numberic identifiers but can be longer.
+// Therefore non-numberic identifiers must go first.
 
-createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NUMERICIDENTIFIER]
-}|${src[t.NONNUMERICIDENTIFIER]})`)
+createToken('PRERELEASEIDENTIFIER', `(?:${src[t.NONNUMERICIDENTIFIER]
+}|${src[t.NUMERICIDENTIFIER]})`)
 
-createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NUMERICIDENTIFIERLOOSE]
-}|${src[t.NONNUMERICIDENTIFIER]})`)
+createToken('PRERELEASEIDENTIFIERLOOSE', `(?:${src[t.NONNUMERICIDENTIFIER]
+}|${src[t.NUMERICIDENTIFIERLOOSE]})`)
 
 // ## Pre-release Version
 // Hyphen, followed by one or more dot-separated pre-release version
@@ -23155,6 +23269,9 @@ createToken('GTE0PRE', '^\\s*>=\\s*0\\.0\\.0-0\\s*$')
 /***/ 9380:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 // Determine if version is greater than all the versions possible in the range.
 const outside = __nccwpck_require__(420)
 const gtr = (version, range, options) => outside(version, range, '>', options)
@@ -23166,6 +23283,9 @@ module.exports = gtr
 /***/ 7008:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 const intersects = (r1, r2, options) => {
   r1 = new Range(r1, options)
@@ -23180,6 +23300,9 @@ module.exports = intersects
 /***/ 3323:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const outside = __nccwpck_require__(420)
 // Determine if version is less than all the versions possible in the range
 const ltr = (version, range, options) => outside(version, range, '<', options)
@@ -23191,6 +23314,9 @@ module.exports = ltr
 /***/ 579:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 
@@ -23223,6 +23349,9 @@ module.exports = maxSatisfying
 /***/ 832:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 const minSatisfying = (versions, range, options) => {
@@ -23254,6 +23383,9 @@ module.exports = minSatisfying
 /***/ 4179:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const Range = __nccwpck_require__(9828)
 const gt = __nccwpck_require__(4123)
@@ -23322,6 +23454,9 @@ module.exports = minVersion
 /***/ 420:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const SemVer = __nccwpck_require__(8088)
 const Comparator = __nccwpck_require__(1532)
 const { ANY } = Comparator
@@ -23409,6 +23544,9 @@ module.exports = outside
 /***/ 5297:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 // given a set of versions and a range, create a "simplified" range
 // that includes the same versions that the original range does
 // If the original range is shorter than the simplified one, return that.
@@ -23463,6 +23601,9 @@ module.exports = (versions, range, options) => {
 /***/ 7863:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 const Comparator = __nccwpck_require__(1532)
 const { ANY } = Comparator
@@ -23717,6 +23858,9 @@ module.exports = subset
 /***/ 2706:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 
 // Mostly just for testing and legacy API reasons
@@ -23732,6 +23876,9 @@ module.exports = toComparators
 /***/ 2098:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
+"use strict";
+
+
 const Range = __nccwpck_require__(9828)
 const validRange = (range, options) => {
   try {
@@ -29355,7 +29502,7 @@ module.exports = {
 
 
 const { parseSetCookie } = __nccwpck_require__(4408)
-const { stringify, getHeadersList } = __nccwpck_require__(3121)
+const { stringify } = __nccwpck_require__(3121)
 const { webidl } = __nccwpck_require__(1744)
 const { Headers } = __nccwpck_require__(554)
 
@@ -29431,14 +29578,13 @@ function getSetCookies (headers) {
 
   webidl.brandCheck(headers, Headers, { strict: false })
 
-  const cookies = getHeadersList(headers).cookies
+  const cookies = headers.getSetCookie()
 
   if (!cookies) {
     return []
   }
 
-  // In older versions of undici, cookies is a list of name:value.
-  return cookies.map((pair) => parseSetCookie(Array.isArray(pair) ? pair[1] : pair))
+  return cookies.map((pair) => parseSetCookie(pair))
 }
 
 /**
@@ -29866,14 +30012,15 @@ module.exports = {
 /***/ }),
 
 /***/ 3121:
-/***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
+/***/ ((module) => {
 
 "use strict";
 
 
-const assert = __nccwpck_require__(9491)
-const { kHeadersList } = __nccwpck_require__(2785)
-
+/**
+ * @param {string} value
+ * @returns {boolean}
+ */
 function isCTLExcludingHtab (value) {
   if (value.length === 0) {
     return false
@@ -30134,31 +30281,13 @@ function stringify (cookie) {
   return out.join('; ')
 }
 
-let kHeadersListNode
-
-function getHeadersList (headers) {
-  if (headers[kHeadersList]) {
-    return headers[kHeadersList]
-  }
-
-  if (!kHeadersListNode) {
-    kHeadersListNode = Object.getOwnPropertySymbols(headers).find(
-      (symbol) => symbol.description === 'headers list'
-    )
-
-    assert(kHeadersListNode, 'Headers cannot be parsed')
-  }
-
-  const headersList = headers[kHeadersListNode]
-  assert(headersList)
-
-  return headersList
-}
-
 module.exports = {
   isCTLExcludingHtab,
-  stringify,
-  getHeadersList
+  validateCookieName,
+  validateCookiePath,
+  validateCookieValue,
+  toIMFDate,
+  stringify
 }
 
 
@@ -32087,6 +32216,14 @@ const { isUint8Array, isArrayBuffer } = __nccwpck_require__(9830)
 const { File: UndiciFile } = __nccwpck_require__(8511)
 const { parseMIMEType, serializeAMimeType } = __nccwpck_require__(685)
 
+let random
+try {
+  const crypto = __nccwpck_require__(6005)
+  random = (max) => crypto.randomInt(0, max)
+} catch {
+  random = (max) => Math.floor(Math.random(max))
+}
+
 let ReadableStream = globalThis.ReadableStream
 
 /** @type {globalThis['File']} */
@@ -32172,7 +32309,7 @@ function extractBody (object, keepalive = false) {
     // Set source to a copy of the bytes held by object.
     source = new Uint8Array(object.buffer.slice(object.byteOffset, object.byteOffset + object.byteLength))
   } else if (util.isFormDataLike(object)) {
-    const boundary = `----formdata-undici-0${`${Math.floor(Math.random() * 1e11)}`.padStart(11, '0')}`
+    const boundary = `----formdata-undici-0${`${random(1e11)}`.padStart(11, '0')}`
     const prefix = `--${boundary}\r\nContent-Disposition: form-data`
 
     /*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
@@ -34154,6 +34291,7 @@ const {
   isValidHeaderName,
   isValidHeaderValue
 } = __nccwpck_require__(2538)
+const util = __nccwpck_require__(3837)
 const { webidl } = __nccwpck_require__(1744)
 const assert = __nccwpck_require__(9491)
 
@@ -34707,6 +34845,9 @@ Object.defineProperties(Headers.prototype, {
   [Symbol.toStringTag]: {
     value: 'Headers',
     configurable: true
+  },
+  [util.inspect.custom]: {
+    enumerable: false
   }
 })
 
@@ -43883,6 +44024,20 @@ class Pool extends PoolBase {
       ? { ...options.interceptors }
       : undefined
     this[kFactory] = factory
+
+    this.on('connectionError', (origin, targets, error) => {
+      // If a connection error occurs, we remove the client from the pool,
+      // and emit a connectionError event. They will not be re-used.
+      // Fixes https://github.com/nodejs/undici/issues/3895
+      for (const target of targets) {
+        // Do not use kRemoveClient here, as it will close the client,
+        // but the client cannot be closed in this state.
+        const idx = this[kClients].indexOf(target)
+        if (idx !== -1) {
+          this[kClients].splice(idx, 1)
+        }
+      }
+    })
   }
 
   [kGetDispatcher] () {
@@ -48736,6 +48891,14 @@ module.exports = require("net");
 
 /***/ }),
 
+/***/ 6005:
+/***/ ((module) => {
+
+"use strict";
+module.exports = require("node:crypto");
+
+/***/ }),
+
 /***/ 5673:
 /***/ ((module) => {
 

From 549a8f02e85c958cc9bf9715cc0d4f1be114876a Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 8 Oct 2025 11:33:55 -0700
Subject: [PATCH 13/16] Add support for legacy way to activate base environment

---
 .github/workflows/example-16.yml | 53 ++++++++++++++++++++++++++------
 dist/delete/index.js             |  9 ++++--
 dist/setup/index.js              |  9 ++++--
 src/input.ts                     | 10 ++++--
 4 files changed, 66 insertions(+), 15 deletions(-)

diff --git a/.github/workflows/example-16.yml b/.github/workflows/example-16.yml
index f9f7e4fc..91556b45 100644
--- a/.github/workflows/example-16.yml
+++ b/.github/workflows/example-16.yml
@@ -10,14 +10,14 @@ on:
     - cron: "0 0 * * *"
 
 jobs:
-  example-16:
+  example-16-build:
     # prevent cronjobs from running on forks
     if:
       (github.event_name == 'schedule' && github.repository ==
       'conda-incubator/setup-miniconda') || (github.event_name != 'schedule')
     name:
-      Ex16 (os=${{matrix.os}}, default env=${{ matrix.add-activation-env ==
-      'true' && 'default' || 'base' }})
+      Build Ex16 (os=${{matrix.os}}, default env=${{ matrix.add-activation-env
+      == 'true' && 'default' || 'base' }})
     runs-on: ${{ matrix.os }}-latest
     strategy:
       fail-fast: false
@@ -56,13 +56,43 @@ jobs:
               EXT: ${{ matrix.os == 'windows' && 'exe' || 'sh' }}
           input-directory: etc/example-installers/default-environment/
 
+      - name: Upload installer to Github artifact
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        with:
+          path: ${{ steps.create-installer.outputs.artifacts-directory }}/*
+          name:
+            ex16-${{ matrix.os }}-${{ matrix.add-activation-env == 'false' &&
+            'no-' }}-activation-env
+
+  example-16-test:
+    needs: [example-16-build]
+    name:
+      Test Ex16 (os=${{matrix.os}}, default env=${{ matrix.add-activation-env ==
+      'true' && 'default' || 'base' }}, auto-activate-base=${{
+      matrix.auto-activate-base }})
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        auto-activate-base: ["false", "true"]
+        add-activation-env: ["false", "true"]
+        os: ["ubuntu", "windows"]
+    steps:
+      - name: Obtain artifact
+        uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
+        with:
+          name:
+            ex16-${{ matrix.os }}-${{ matrix.add-activation-env == 'false' &&
+            'no-' }}-activation-env
+          path: ${{ runner.temp }}/_installer
+
       - name: Determine installer file name
         id: installer-file
         env:
-          ARTIFACTS_DIRECTORY:
-            ${{ steps.create-installer.outputs.artifacts-directory }}
+          ARTIFACTS_DIRECTORY: ${{ runner.temp }}/_installer
           EXT: ${{ matrix.os == 'windows' && 'exe' || 'sh' }}
         run: |
+          [[ "$(uname)" == MINGW* ]] && ARTIFACTS_DIRECTORY=$(cygpath "${ARTIFACTS_DIRECTORY}")
           INSTALLER_FILE=$(find "${ARTIFACTS_DIRECTORY}" -name "*.${EXT}" | head -n 1)
           echo "installer-file=${INSTALLER_FILE}" >> ${GITHUB_OUTPUT}
         shell: bash
@@ -71,7 +101,11 @@ jobs:
         uses: ./
         with:
           activate-environment: ""
-          auto-activate: true
+          auto-activate-base:
+            ${{ matrix.auto-activate-base == 'true' && 'true' ||
+            'legacy-placeholder' }}
+          auto-activate:
+            ${{ matrix.auto-activate-base == 'true' && '' || 'true' }}
           installation-dir: ${{ runner.temp }}/installer_test
           installer-url:
             file://${{ steps.installer-file.outputs.installer-file }}
@@ -90,7 +124,6 @@ jobs:
         env:
           TEST_DIR: ${{ runner.temp }}\installer_output
         run: |
-          type %CONDA%\condabin\conda_hook.bat
           conda info --json > "%TEST_DIR%\cmd.exe.json"
         shell: cmd /C CALL {0}
 
@@ -104,12 +137,14 @@ jobs:
       - name: Test default environments
         env:
           DEFAULT_ENV:
-            ${{ matrix.add-activation-env == 'true' && 'default' || 'base' }}
+            ${{ matrix.add-activation-env == 'true' && matrix.auto-activate-base
+            == 'false' && 'default' || 'base' }}
           TEST_DIR: ${{ runner.temp }}/installer_output
         run: |
           import json
           import os
           from pathlib import Path
+
           json_dir = Path(os.environ["TEST_DIR"])
           default_env_expected = os.environ["DEFAULT_ENV"]
           incorrect_environments = {}
@@ -117,7 +152,7 @@ jobs:
               conda_info = json.loads(file.read_text())
               default_env = conda_info.get("active_prefix_name")
               if default_env != default_env_expected:
-                incorrect_environments[str(file.name).removesuffix(".json")] = default_env
+                  incorrect_environments[str(file.name).removesuffix(".json")] = default_env
           if incorrect_environments:
               raise AssertionError(
                   f"Found incorrect default environments: {incorrect_environments}"
diff --git a/dist/delete/index.js b/dist/delete/index.js
index 2e1d0d9c..23a60680 100644
--- a/dist/delete/index.js
+++ b/dist/delete/index.js
@@ -28694,10 +28694,15 @@ function parseInputs() {
             arch = "aarch64";
         }
         if (core.getInput("auto-activate-base") !== "legacy-placeholder") {
-            core.warning("`auto-activate-base` is deprecated. Please use `auto-activate`.");
+            core.warning("`auto-activate-base` is deprecated. Please use `auto-activate`. " +
+                "If your installer does not use the `base` environment as the default environment, " +
+                "also add `activate-environment: base`.");
         }
         const inputs = Object.freeze({
-            activateEnvironment: core.getInput("activate-environment"),
+            activateEnvironment: core.getInput("auto-activate-base") === "true" &&
+                core.getInput("activate-environment") === ""
+                ? "base"
+                : core.getInput("activate-environment"),
             architecture: arch,
             condaBuildVersion: core.getInput("conda-build-version"),
             condaConfigFile: core.getInput("condarc-file"),
diff --git a/dist/setup/index.js b/dist/setup/index.js
index c4db5eb1..be78c854 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -47819,10 +47819,15 @@ function parseInputs() {
             arch = "aarch64";
         }
         if (core.getInput("auto-activate-base") !== "legacy-placeholder") {
-            core.warning("`auto-activate-base` is deprecated. Please use `auto-activate`.");
+            core.warning("`auto-activate-base` is deprecated. Please use `auto-activate`. " +
+                "If your installer does not use the `base` environment as the default environment, " +
+                "also add `activate-environment: base`.");
         }
         const inputs = Object.freeze({
-            activateEnvironment: core.getInput("activate-environment"),
+            activateEnvironment: core.getInput("auto-activate-base") === "true" &&
+                core.getInput("activate-environment") === ""
+                ? "base"
+                : core.getInput("activate-environment"),
             architecture: arch,
             condaBuildVersion: core.getInput("conda-build-version"),
             condaConfigFile: core.getInput("condarc-file"),
diff --git a/src/input.ts b/src/input.ts
index a4918da6..ff723834 100644
--- a/src/input.ts
+++ b/src/input.ts
@@ -95,11 +95,17 @@ export async function parseInputs(): Promise<types.IActionInputs> {
   }
   if (core.getInput("auto-activate-base") !== "legacy-placeholder") {
     core.warning(
-      "`auto-activate-base` is deprecated. Please use `auto-activate`.",
+      "`auto-activate-base` is deprecated. Please use `auto-activate`. " +
+        "If your installer does not use the `base` environment as the default environment, " +
+        "also add `activate-environment: base`.",
     );
   }
   const inputs: types.IActionInputs = Object.freeze({
-    activateEnvironment: core.getInput("activate-environment"),
+    activateEnvironment:
+      core.getInput("auto-activate-base") === "true" &&
+      core.getInput("activate-environment") === ""
+        ? "base"
+        : core.getInput("activate-environment"),
     architecture: arch,
     condaBuildVersion: core.getInput("conda-build-version"),
     condaConfigFile: core.getInput("condarc-file"),

From d8ee8232e1a0320de7159dcb622a4393d7b5772e Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Wed, 8 Oct 2025 11:59:36 -0700
Subject: [PATCH 14/16] Add checkout step

---
 .github/workflows/example-16.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/example-16.yml b/.github/workflows/example-16.yml
index 91556b45..edcc0695 100644
--- a/.github/workflows/example-16.yml
+++ b/.github/workflows/example-16.yml
@@ -78,6 +78,10 @@ jobs:
         add-activation-env: ["false", "true"]
         os: ["ubuntu", "windows"]
     steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+
       - name: Obtain artifact
         uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
         with:
@@ -92,7 +96,6 @@ jobs:
           ARTIFACTS_DIRECTORY: ${{ runner.temp }}/_installer
           EXT: ${{ matrix.os == 'windows' && 'exe' || 'sh' }}
         run: |
-          [[ "$(uname)" == MINGW* ]] && ARTIFACTS_DIRECTORY=$(cygpath "${ARTIFACTS_DIRECTORY}")
           INSTALLER_FILE=$(find "${ARTIFACTS_DIRECTORY}" -name "*.${EXT}" | head -n 1)
           echo "installer-file=${INSTALLER_FILE}" >> ${GITHUB_OUTPUT}
         shell: bash

From 77ffed7c340499faf47868c72712f2e605eebb6d Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Thu, 9 Oct 2025 13:26:58 -0700
Subject: [PATCH 15/16] Remove setup-micromamba step

---
 .github/workflows/example-16.yml | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/.github/workflows/example-16.yml b/.github/workflows/example-16.yml
index edcc0695..12978059 100644
--- a/.github/workflows/example-16.yml
+++ b/.github/workflows/example-16.yml
@@ -29,12 +29,6 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Download micromamba to create installer
-        uses: mamba-org/setup-micromamba@7f29b8b80078b1b601dfa018b0f7425c587c63bb # v2.0.6
-        with:
-          init-shell: none
-          micromamba-version: "latest"
-
       - name: Set up Miniconda for installer builds
         uses: ./
         with:

From 76ae7924a3c21b4e3ce70899183fe2fb162aa672 Mon Sep 17 00:00:00 2001
From: Marco Esters <mesters@anaconda.com>
Date: Mon, 20 Oct 2025 13:28:26 -0700
Subject: [PATCH 16/16] Also account for default environments as paths

---
 dist/setup/index.js | 18 +++++++++++++++++-
 src/conda.ts        | 27 ++++++++++++++++++++++++++-
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/dist/setup/index.js b/dist/setup/index.js
index be78c854..5bf76035 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -47000,6 +47000,20 @@ function applyCondaConfiguration(inputs, options) {
     });
 }
 exports.applyCondaConfiguration = applyCondaConfiguration;
+function _getFullEnvironmentPath(inputPathOrName, inputs, options) {
+    if (!inputPathOrName.includes("/")) {
+        // likely an environment name
+        const installationDirectory = condaBasePath(inputs, options);
+        if (utils.isBaseEnv(inputPathOrName)) {
+            return path.resolve(installationDirectory);
+        }
+        return path.resolve(installationDirectory, "envs", inputPathOrName);
+    }
+    if (inputPathOrName.startsWith("~/")) {
+        return path.resolve(os.homedir(), inputPathOrName.slice(2));
+    }
+    return path.resolve(inputPathOrName);
+}
 /*
  * Whether an environment is the default environment
  */
@@ -47011,7 +47025,9 @@ function isDefaultEnvironment(envName, inputs, options) {
         const configsOutput = (yield condaCommand(["config", "--show", "--json"], inputs, options, true));
         const config = JSON.parse(configsOutput);
         if (config.default_activation_env) {
-            return config.default_activation_env === envName;
+            const defaultEnv = _getFullEnvironmentPath(config.default_activation_env, inputs, options);
+            const activationEnv = _getFullEnvironmentPath(envName, inputs, options);
+            return defaultEnv === activationEnv;
         }
         return utils.isBaseEnv(envName);
     });
diff --git a/src/conda.ts b/src/conda.ts
index 4433fca2..4bd37921 100644
--- a/src/conda.ts
+++ b/src/conda.ts
@@ -290,6 +290,25 @@ export async function applyCondaConfiguration(
   await condaCommand(["config", "--show"], inputs, options);
 }
 
+function _getFullEnvironmentPath(
+  inputPathOrName: string,
+  inputs: types.IActionInputs,
+  options: types.IDynamicOptions,
+): string {
+  if (!inputPathOrName.includes("/")) {
+    // likely an environment name
+    const installationDirectory = condaBasePath(inputs, options);
+    if (utils.isBaseEnv(inputPathOrName)) {
+      return path.resolve(installationDirectory);
+    }
+    return path.resolve(installationDirectory, "envs", inputPathOrName);
+  }
+  if (inputPathOrName.startsWith("~/")) {
+    return path.resolve(os.homedir(), inputPathOrName.slice(2));
+  }
+  return path.resolve(inputPathOrName);
+}
+
 /*
  * Whether an environment is the default environment
  */
@@ -309,7 +328,13 @@ async function isDefaultEnvironment(
   )) as string;
   const config = JSON.parse(configsOutput) as types.ICondaConfig;
   if (config.default_activation_env) {
-    return config.default_activation_env === envName;
+    const defaultEnv = _getFullEnvironmentPath(
+      config.default_activation_env,
+      inputs,
+      options,
+    );
+    const activationEnv = _getFullEnvironmentPath(envName, inputs, options);
+    return defaultEnv === activationEnv;
   }
   return utils.isBaseEnv(envName);
 }