🔀 Merge main: js-core subpackages, profiler transport refactor

Resolves conflicts from js-core/assembly, js-core/util, js-core/monitor
entry points and profiler transport extraction. Converts new spec files
from Jasmine to Vitest API. Adds missing vitest aliases for new
js-core subpath imports.

Author: mormubis

.gitignore

@@ -3,6 +3,7 @@
 bundle
 cjs
 esm
+temp
 node_modules
 coverage
 tunnel.log

.gitlab-ci.yml

@@ -296,6 +296,16 @@ check-schemas:
     - yarn
     - node scripts/check-schemas.ts
 
+check-js-core-api:
+  extends:
+    - .base-configuration
+    - .test-allowed-branches
+  interruptible: true
+  script:
+    - yarn
+    - yarn workspace @datadog/js-core build
+    - yarn api:check
+
 unit-bs:
   stage: browserstack
   needs: ['unit']

.prettierignore

@@ -13,5 +13,8 @@ yarn.lock
 /developer-extension/.output
 /developer-extension/.wxt
 
+# Auto-generated by API Extractor — do not format
+/packages/js-core/api
+
 # Symlinks (prettier would otherwise resolve and overwrite the target file or replace the symlink with a regular file)
 /packages/browser-rum-slim/BROWSER_SUPPORT.md

CHANGELOG.md

@@ -209,6 +209,11 @@ This is the v7 major release. It removes deprecated options and legacy code path
 - **Higher-quality data** — deterministic sampling (consistent decisions across products), aborted requests no longer polluting error metrics, and a new `session_renewal` view loading type to better understand session boundaries.
 - **A cleaner API** — deprecated options and beta flags removed; what's left is the supported, stable surface going forward.
 
+> [!WARNING]
+> Upgrading to v7 introduces deterministic sampling for distributed traces based on the RUM session ID. As a result, under RUM without Limits, the likelihood to index sessions that had sampled associated traces is significantly increased — meaning more traces will now be retained by your existing Cross-Product Retention Filters RUMxAPM, even without any configuration change.
+>
+> If you have cross-product Retention Filters (e.g. RUM-linked APM traces), you may see an **increase in the volume of indexed spans**, which could lead to **higher costs**. We recommend reviewing your Retention Filter configuration and estimated span volume after upgrading.
+
 **Migrating from v6:**
 
 - Follow the [v6 → v7 migration guide](https://github.com/DataDog/documentation/blob/8ed5928d4cf04351f6ec6f6e8d605267def58351/content/en/real_user_monitoring/guide/browser-sdk-upgrade.md) in the Datadog documentation.

LICENSE-3rdparty.csv

@@ -38,12 +38,14 @@ dev,@typescript-eslint/utils,MIT,Copyright (c) 2019 typescript-eslint and other
 dev,@wxt-dev/module-react,MIT,Copyright (c) 2023 Aaron
 dev,@vitejs/plugin-react,MIT,Copyright (c) 2019-present Evan You & Vite Contributors
 dev,@vitejs/plugin-vue,MIT,Copyright (c) 2019-present, Yuxi (Evan) You and Vite contributors
+dev,@microsoft/api-extractor,MIT,Copyright (c) Microsoft Corporation. All rights reserved.
 dev,@vitest/browser,MIT,Copyright (c) 2021-Present VoidZero Inc. and Vitest contributors
 dev,@vitest/browser-playwright,MIT,Copyright (c) 2021-Present VoidZero Inc. and Vitest contributors
 dev,@vitest/browser-webdriverio,MIT,Copyright (c) 2021-Present VoidZero Inc. and Vitest contributors
 dev,webdriverio,MIT,Copyright (c) OpenJS Foundation and other contributors
 dev,@vitest/coverage-istanbul,MIT,Copyright (c) 2021-Present VoidZero Inc. and Vitest contributors
 dev,@module-federation/enhanced,MIT, Copyright (c) 2020 ScriptedAlchemy LLC (Zack Jackson) Zhou Shaw (zhouxiao)
+dev,@vue/compiler-dom,MIT,Copyright (c) 2018-present, Yuxi (Evan) You
 dev,@vue/test-utils,MIT,Copyright (c) 2021-present vuejs
 dev,acorn,MIT,Copyright (C) 2012-2022 by various contributors (see AUTHORS)
 dev,ajv,MIT,Copyright 2015-2017 Evgeny Poberezkin

developer-extension/package.json

@@ -11,7 +11,8 @@
     "@types/react": "19.2.17",
     "@types/react-dom": "19.2.3",
     "@wxt-dev/module-react": "1.2.2",
-    "typescript": "6.0.3"
+    "typescript": "6.0.3",
+    "vite": "8.0.16"
   },
   "dependencies": {
     "@datadog/browser-core": "workspace:*",

eslint-local-rules/disallowSideEffects.ts

@@ -45,7 +45,10 @@ const pathsWithSideEffect = new Set([
 
 // Those packages are known to have no side effects when evaluated
 const packagesWithoutSideEffect = new Set([
+  '@datadog/js-core/assembly',
   '@datadog/js-core/time',
+  '@datadog/js-core/util',
+  '@datadog/js-core/monitor',
   '@datadog/browser-core',
   '@datadog/browser-rum-core',
   '@datadog/browser-rum-react/internal',

package.json

@@ -11,6 +11,7 @@
   ],
   "type": "module",
   "scripts": {
+    "api:check": "node scripts/check-js-core-api.ts",
     "build": "yarn workspaces foreach --all --parallel --topological-dev run build",
     "build:bundle": "yarn workspaces foreach --all --parallel run build:bundle",
     "build:apps": "node scripts/build/build-test-apps.ts",
@@ -45,6 +46,7 @@
     "@datadog/rum-events-format": "DataDog/rum-events-format#commit=02c94b31a2676458a156ed627f3edcd87254beb7",
     "@eslint/js": "10.0.1",
     "@jsdevtools/coverage-istanbul-loader": "3.0.5",
+    "@microsoft/api-extractor": "7.58.9",
     "@playwright/test": "1.60.0",
     "@swc/core": "1.15.40",
     "@types/busboy": "1.5.4",
@@ -107,12 +109,12 @@
     "webpack-dev-middleware": "8.0.3",
     "ws": "8.21.0"
   },
+  "resolutions": {
+    "@wxt-dev/module-react/@vitejs/plugin-react": "5.2.0"
+  },
   "volta": {
     "node": "26.3.0",
     "yarn": "4.16.0"
   },
-  "packageManager": "yarn@4.16.0",
-  "resolutions": {
-    "@wxt-dev/module-react/@vitejs/plugin-react": "5.2.0"
-  }
+  "packageManager": "yarn@4.16.0"
 }

packages/browser-core/AGENTS.md

@@ -0,0 +1,21 @@
+# `@datadog/browser-core` package
+
+`@datadog/browser-core` is primarily consumed by other `@datadog/browser-*` packages within this
+monorepo. It is published to npm but **not supported for external use** and carries **no semver
+stability guarantee**.
+
+## Breaking changes are allowed
+
+External consumers exist but are unsupported — we do not guarantee compatibility for them. You may
+freely:
+
+- Remove or rename exported symbols
+- Change function signatures (parameters, return types, arity)
+- Reorganize modules and re-exports
+
+When migrating code from `@datadog/browser-core` to `@datadog/js-core`, do **not** keep a
+backward-compatible re-export in `browser-core` just to avoid a "breaking change" — there is no
+breaking change here. Move the code and update all internal call sites directly.
+
+Review comments that warn about "breaking changes" in this package (e.g. removed exports,
+signature changes) are **not applicable** and should be disregarded.

packages/browser-core/package.json

@@ -23,7 +23,7 @@
     "directory": "packages/browser-core"
   },
   "dependencies": {
-    "@datadog/js-core": "0.0.2"
+    "@datadog/js-core": "0.0.3"
   },
   "devDependencies": {
     "@types/pako": "2.0.4",