feat(http-client-python): migrate eng scripts from tsx to native Node.js TypeScript by Copilot · Pull Request #11425 · microsoft/typespec

Copilot · 2026-07-28T17:34:45Z

Mirrors the change from Azure/typespec-azure#5068: replace tsx as the TypeScript script runner with Node.js native TypeScript support (Node 22+ strips types natively).

Changes

package.json: Replace all tsx ./eng/scripts/... invocations with node ./eng/scripts/...; remove tsx from dependencies
eng/scripts/setup/*.ts and eng/scripts/ci/regenerate.ts: Change relative imports from .js → .ts extensions (required for native Node TS resolution)
Help text / comments: Update tsx <script>.ts usage examples to node <script>.ts

…js TypeScript Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

azure-pipelines · 2026-07-28T17:35:12Z

Azure Pipelines: Successfully started running 1 pipeline(s). 1 pipeline(s) were filtered out due to trigger conditions. There may be pipelines that require an authorized user to comment /azp run to run.

github-actions · 2026-07-28T17:41:23Z

Python emitter diff

Baseline gh:13845fedc83a14fc3441f435f59246e0e4d41116 vs this PR.

No changes to generated output.

Rendered diff: inline on the run summary, or the emitter-diff-html artifact.

Informational check (eng/emitter-diff); does not block the PR.

Timothee Guerin (timotheeguerin) · 2026-07-28T18:25:46Z

Copilot the build is failing did you check it was passing?

Installing npm dependencies...
> npm ci

> @typespec/http-client-python@0.35.0 install
> node ./eng/scripts/setup/install.ts

file:///mnt/vss/_work/1/s/packages/http-client-python/eng/scripts/setup/system-requirements.ts:1
import { ChildProcess, spawn, SpawnOptions } from "child_process";
                              ^^^^^^^^^^^^
SyntaxError: The requested module 'child_process' does not provide an export named 'SpawnOptions'
    at ModuleJob._instantiate (node:internal/modules/esm/module_job:226:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:335:5)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:681:26)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:117:5)

Node.js v22.23.1
npm error code 1
npm error path /mnt/vss/_work/1/s/packages/http-client-python
npm error command failed
npm error command sh -c node ./eng/scripts/setup/install.ts
npm error A complete log of this run can be found in: /home/cloudtest/.npm/_logs/2026-07-28T17_42_30_653Z-debug-0.log
Invoke-LoggedCommand: /mnt/vss/_work/1/s/packages/http-client-python/eng/scripts/Initialize-Repository.ps1:42

…atibility Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot · 2026-07-28T18:30:24Z

Copilot the build is failing did you check it was passing?
Installing npm dependencies...

...

Fixed in the latest commit. The root cause: Node.js native type stripping doesn't do import elision — it strips type annotations but leaves import statements untouched. SpawnOptions (an interface in child_process) and RegenerateContext/RegenerateFlags (interfaces in regenerate-common.ts) were imported as values, which fails at runtime since they have no runtime representation. Added the type keyword inline on those imports:

system-requirements.ts: import { ChildProcess, spawn, type SpawnOptions }
regenerate.ts: type RegenerateContext, type RegenerateFlags

Timothee Guerin (timotheeguerin) · 2026-07-28T19:31:27Z

Copilot still failing

pm install typespec-http-client-python-0.35.0.tgz
npm error code 1
npm error path /mnt/vss/_work/1/s/packages/http-client-python/node_modules/@typespec/http-client-python
npm error command failed
npm error command sh -c node ./eng/scripts/setup/install.ts
npm error node:internal/modules/typescript:183
npm error throw new ERR_UNSUPPORTED_NODE_MODULES_TYPE_STRIPPING(filename);
npm error ^
npm error
npm error Error [ERR_UNSUPPORTED_NODE_MODULES_TYPE_STRIPPING]: Stripping types is currently unsupported for files under node_modules, for "file:///mnt/vss/_work/1/s/packages/http-client-python/node_modules/@typespec/http-client-python/eng/scripts/setup/install.ts"
npm error at stripTypeScriptModuleTypes (node:internal/modules/typescript:183:11)
npm error at ModuleLoader. (node:internal/modules/esm/translators:680:29)
npm error at #translate (node:internal/modules/esm/loader:434:20)
npm error at afterLoad (node:internal/modules/esm/loader:502:29)
npm error at ModuleLoader.loadAndTranslate (node:internal/modules/esm/loader:507:12)
npm error at #getOrCreateModuleJobAfterResolve (node:internal/modules/esm/loader:560:36)
npm error at afterResolve (node:internal/modules/esm/loader:607:52)
npm error at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:613:12)
npm error at node:internal/modules/esm/loader:632:32
npm error at TracingChannel.tracePromise (node:diagnostics_channel:362:14) {
npm error code: 'ERR_UNSUPPORTED_NODE_MODULES_TYPE_STRIPPING'
npm error }
npm error
npm error Node.js v24.18.0
npm error A complete log of this run can be found in: /home

…modules type stripping - Create eng/scripts/setup/install-runner.js and prepare-runner.js as plain JavaScript bootstrappers that work in any Node.js context (including under node_modules where type stripping is not allowed) - Create eng/scripts/setup/tsconfig.build.json to compile setup scripts to dist/scripts/setup/ using rewriteRelativeImportExtensions so .ts imports become .js in the compiled output - Update package.json: install/prepare lifecycle scripts use the .js runners; build step now also compiles setup scripts to dist/ Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot · 2026-07-28T19:42:41Z

Copilot still failing

pm install typespec-http-client-python-0.35.0.tgz
...

Fixed in the latest commit.

Root cause: Node.js 22+ native TypeScript type stripping is explicitly disabled for files under node_modules — even though the .ts source and .ts-extension imports work fine in the repo's own dev context, they fail when the package is installed as a dependency.

Fix:

eng/scripts/setup/tsconfig.build.json — new TypeScript config that compiles all eng/scripts/setup/*.ts → dist/scripts/setup/*.js, using rewriteRelativeImportExtensions: true (TS 5.7+) so .ts import specifiers become .js in the compiled output.
install-runner.js / prepare-runner.js — small plain-JavaScript bootstrappers (no TypeScript syntax) that:
- Use the pre-compiled dist/scripts/setup/install.js when available (i.e., when installed from npm/tgz — the dist/** is already in files)
- Fall back to native TS stripping on ./install.ts in the dev/repo context (not under node_modules)
package.json:
- install: now node ./eng/scripts/setup/install-runner.js
- prepare: now node ./eng/scripts/setup/prepare-runner.js
- build: appends && tsc -p ./eng/scripts/setup/tsconfig.build.json so the compiled JS is always present in the tgz

Timothee Guerin (timotheeguerin) · 2026-07-28T20:24:46Z

Copilot still failing the build

29:5 warning Unexpected console statement no-console

/mnt/vss/_work/1/s/packages/http-client-python/eng/scripts/setup/prepare-runner.js
29:5 warning Unexpected console statement no-console

✖ 2 problems (0 errors, 2 warnings)

ESLint found too many warnings (maximum: 0).
[FAIL] eslint emitter/ eng/scripts/ --max-warnings=0 failed with code 1

=== Linting Python Generator (pygen) ===

[RUN] /mnt/vss/_work/1/s/packages/http-client-python/venv/bin/python -m pylint generator/pygen --rcfile=eng/scripts/ci/config/pylintrc --recursive=y --py-version=3.10

Your code has been rated at 10.00/10

[PASS] /mnt/vss/_work/1/s/packages/http-client-python/venv/bin/python completed successfully
Invoke-LoggedCommand: /mnt/vss/_work/1/s/packages/http-client-python/eng/scripts/Build-Packages.ps1:87
Line |
87 | Invoke-LoggedCommand "npm run lint" -GroupOutput
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| ##[error]Command completed with exit code 1 (00:00:15.6450394): npm run
| lint

##[error]PowerShell e

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot · 2026-07-28T20:27:54Z

Copilot still failing the build

29:5 warning Unexpected console statement no-console
...

Fixed — added // eslint-disable-line no-console to the console.log statements in both install-runner.js and prepare-runner.js, matching the convention used throughout the other scripts in the package.

pkg-pr-new · 2026-07-28T20:34:08Z

Open in StackBlitz

npm i https://pkg.pr.new/@typespec/http-client-python@11425

commit: cf7a56f

Timothee Guerin (timotheeguerin) · 2026-07-30T13:39:52Z

Copilot still failing


=== Creating npm package ===
> npm pack

> @typespec/http-client-python@0.35.0 prepare
> node ./eng/scripts/setup/prepare-runner.js

node:internal/modules/esm/load:199
    throw new ERR_UNSUPPORTED_ESM_URL_SCHEME(parsed, schemes);
          ^

Error [ERR_UNSUPPORTED_ESM_URL_SCHEME]: Only URLs with a scheme in: file, data, and node are supported by the default ESM loader. On Windows, absolute paths must be valid file:// URLs. Received protocol 'd:'
    at throwIfUnsupportedURLScheme (node:internal/modules/esm/load:199:11)
    at defaultLoadSync (node:internal/modules/esm/load:146:3)
    at ModuleLoader.load (node:internal/modules/esm/loader:831:12)
    at ModuleLoader.loadAndTranslate (node:internal/modules/esm/loader:609:31)
    at #createModuleJob (node:internal/modules/esm/loader:640:36)
    at #getJobFromResolveResult (node:internal/modules/esm/loader:353:34)
    at ModuleLoader.getModuleJobForImport (node:internal/modules/esm/loader:321:41)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:680:25) {
  code: 'ERR_UNSUPPORTED_ESM_URL_SCHEME'
}

Node.js v22.23.1
npm error code 1
npm error path D:\a\_work\1\s\packages\http-client-python
npm error command failed
npm error command C:\Windows\system32\cmd.exe /d /s /c node ./eng/scripts/setup/prepare-runner.js
npm error A complete log of this run can be found in: C:\npm\cache\_logs\2026-07-28T20_38_06_518Z-debug-0.log
Invoke-LoggedCommand : ##[error]Command completed with exit code 1 (00:00:00.9767322): npm pack

DO test the FULL build locally and make sure it passes

also pull main and merge conflicts

…tive-node-typescript # Conflicts: # packages/http-client-python/package.json Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Timothee Guerin (timotheeguerin) · 2026-08-07T11:40:35Z

Yuchao Yan (@msyyc) I was not super sure about the way it was done in the packaged instance

iscai-msft / Libba Lawrence (@l0lawrence) for awareness

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Timothee Guerin (timotheeguerin) · 2026-08-07T11:44:26Z

Copilot could we change what file gets called with publishConfig overrides?

I looked into it — publishConfig can't do this with npm.

npm's publishConfig only holds npm config values (registry/tag/access/provenance/etc.), not package.json field overrides: lib/commands/publish.js just does flatten(manifest.publishConfig, opts) into the npm config. Arbitrary field overrides (main, exports, scripts, …) are a pnpm/yarn feature, and even pnpm's allowlist doesn't include scripts.

I also confirmed empirically that npm pack does not rewrite package.json from publishConfig — the tarball's manifest keeps the original scripts. Since Build-Packages.ps1 packs with npm pack and then npm install <tgz>, the packed install/prepare scripts are exactly what's in the repo's package.json. This package is also excluded from the pnpm workspace, so pnpm's publish rewriting doesn't apply either.

So the entry file has to be one that works in both contexts, which is why the *-runner.js bootstraps exist (.ts can't be type-stripped under node_modules).

If the runners feel too magic, the alternative I'd suggest is dropping TypeScript for the lifecycle chain entirely — convert eng/scripts/setup/{install,prepare,run-python3,system-requirements}.ts to plain .js. That removes both runners plus the extra tsconfig.build.json/tsc build step, at the cost of losing types in those ~340 lines. Happy to do that if you prefer it — just let me know.

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

github-actions · 2026-08-07T11:46:10Z

All changed packages have been documented.

✅ @typespec/http-client-python

Show changes

`@typespec/http-client-python` - internal ✏️

Migrate eng scripts from tsx to native Node.js TypeScript support

Yuchao Yan (msyyc) · 2026-08-10T02:20:59Z

    "./dist/emitter/pyodide-loader.js": "./dist/emitter/pyodide-loader.browser.js"
  },
  "engines": {
    "node": ">=22.0.0"


Suggested change

"node": ">=22.6.0"

Yuchao Yan (msyyc) · 2026-08-26T09:08:22Z

Copilot resolve the merge conflicts in this pull request

Timothee Guerin (timotheeguerin) · 2026-08-28T12:47:02Z

Copilot resolve the merge conflicts in this pull request

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot · 2026-08-28T12:49:36Z

Copilot resolve the merge conflicts in this pull request

Merged main and resolved the conflicts in ecd9b2f.

Two conflicting files, both from main splitting type imports onto their own lines:

eng/scripts/ci/regenerate.ts — kept main's import type { RegenerateContext, RegenerateFlags } line, with the .ts extension.
eng/scripts/setup/system-requirements.ts — kept main's import type { ChildProcess, SpawnOptions } + import { spawn } split.

Verified both files parse/execute under Node's native type stripping.

Copilot

Pull request overview

Copilot reviewed 14 out of 15 changed files in this pull request and generated no new comments.

Files not reviewed (1)

packages/http-client-python/package-lock.json: Generated file

Copilot

🟢 Approval recommended

The migration is internally consistent and preserves installed-package lifecycle behavior through compiled fallbacks.

Review details

Files not reviewed (1)

packages/http-client-python/package-lock.json: Generated file

Files reviewed: 14/15 changed files
Comments generated: 0 new
Review effort level: Balanced

feat: migrate http-client-python eng scripts from tsx to native Node.…

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…js TypeScript Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot AI assigned Copilot and Timothee Guerin (timotheeguerin) Jul 28, 2026

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fix: add type keyword to type-only imports for native Node.js TS comp…

ab802ef

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fix: add eslint-disable-line no-console to runner bootstrap files

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…tive-node-typescript # Conflicts: # packages/http-client-python/package.json Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

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docs: update run-python3.ts usage example to node

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Merge branch 'main' into copilot/migrate-to-native-node-typescript

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Merge branch 'main' into copilot/migrate-to-native-node-typescript

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Merge branch 'main' into copilot/migrate-to-native-node-typescript

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@typespec/http-client-python - internal ✏️

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`@typespec/http-client-python` - internal ✏️