build: share API declarations across module formats

[Eduardo Villalpando Mello (edvilme)]

Summary

• emit the API package declaration files once under out/types
• point both ESM and CommonJS package exports to the shared declaration entry point
• keep separate ESM and CommonJS JavaScript builds
• ensure package validation rejects duplicated declarations under the runtime output directories

Validation

• npm run compile
• npm run test:package

[Bill Schnurr (bschnurr)]

🔒 Automated review in progress — Bill Schnurr (@bschnurr) is auto-reviewing this PR.

[Bill Schnurr (bschnurr)]

Result: 🔴 could-not-verify

Verification details

Verification: Isolated verification observed failures that were not classified as caused by this PR: API compile validation, API package validation, Dependency and test discovery, Offline API dependency bootstrap.

Summary: Verification could not complete because offline dependency setup failed: TypeScript 5.9.3 was absent from the sandbox cache. Consequently, `npm run compile` could not find `tsc`, and `npm run test:package` stopped while attempting network access before reaching its assertions. These failures are environmental rather than attributable to the PR, but no meaningful test completed successfully.

Test runs: 4 failed

• ❌ Failed | unrelated to this PR | API compile validation | npm run compile
• ❌ Failed | unrelated to this PR | API package validation | npm run test:package
• ❌ Failed | unrelated to this PR | Dependency and test discovery | printf 'sandbox_profile=%s\n' "$AUTOMATION_SANDBOX_PROFILE"; printf 'node='; node --version; printf 'npm='; npm --version; if [ -d node_modules ]; then echo 'root_node_modules=present'; else echo 'root_node_modules=missing'; fi; if [ -d api/node_modules ]; then echo 'api_node_modules=present'; else echo 'api_node_modules=missing'; fi; echo 'api scripts:'; node -e "const p=require('./api/package.json'); console.log(JSON.stringify(p.scripts,null,2))"; echo 'changed files:'; git diff --name-status HEAD^ HEAD; echo 'api diff:'; git diff --unified=3 HEAD^ HEAD -- api/package.json api/scripts/test-package.cjs api/tsconfig.base.json api/tsconfig.types.json
• ❌ Failed | unrelated to this PR | Offline API dependency bootstrap | npm ci --offline

❌ API compile validation diagnostic output

> @vscode/python-environments@1.4.0 compile:types
> tsc -b ./tsconfig.types.json

sh: 1: tsc: not found

❌ API package validation diagnostic output

npm error code EAI_AGAIN
npm error request to https://packagefeedproxy.microsoft.io/npm/@types%2fnode failed, reason: getaddrinfo EAI_AGAIN packagefeedproxy.microsoft.io
Error: Command failed: npm install --ignore-scripts --no-package-lock --no-save ...
The package assertions were not reached.

❌ Dependency and test discovery diagnostic output

sandbox_profile=typescript
node=v22.21.1
npm=10.9.4
root_node_modules=missing
api_node_modules=missing
error: Could not access 'HEAD^'

❌ Offline API dependency bootstrap diagnostic output

npm error code ENOTCACHED
npm error request to https://packagefeedproxy.microsoft.io/npm/typescript/-/typescript-5.9.3.tgz failed: cache mode is 'only-if-cached' but no cached response is available.

[Bill Schnurr (bschnurr)]

Approved via Review Center.

[Heejae Chang (heejaechang)]

Approved via Review Center.