NPM-PACKAGE: Move @microsoft/kiota to ESM-only (lift of #7441)

[gavinbarron]

Summary

Lifts #7441 (by @deinok) onto current main and fixes the issues that kept it from building, so CI automations can run against a clean state.

The npm package @microsoft/kiota moves to ESM-only:

• Ship ESM only — dropped the dual CJS/ESM build and tsconfig.cjs.json / tsconfig.esm.json, single tsconfig.json with module/moduleResolution: nodenext.
• Relocated the remaining root modules (config, connect, install, types, utils, runtime.json) into lib/. Because runtime.json is now under rootDir, tsc emits it to dist/, so the scripts/copy-files.js copy step is no longer needed and was removed.
• package.json: single . export, "type": "module", main/types point at dist/index.js / dist/index.d.ts, files trimmed to dist.
• CI (ci-build.yml, build-vscode-extension.yml): runtimeFilePath now points at vscode/packages/npm-package/lib/runtime.json.

Fixes on top of the original PR

• vscode-jsonrpc/node did not resolve under nodenext (TS2307) because that CJS dependency has no exports map, so extensionless ESM subpath resolution fails. Added the explicit .js (vscode-jsonrpc/node.js) to all 12 importers. This also unblocked cascading implicit any errors in removeItem.ts. The specifier is valid under Node ESM, webpack, and jest.
• tests/unit/install.spec.ts still imported ../../install; updated to ../../lib/install (the original PR missed this file).
• Preserved current main package.json version and dependencies (the original PR carried a stale 1.30.0 bump — version is managed by CI).
• Regenerated vscode/package-lock.json via npm install; it was already consistent, so there is no lockfile diff.

Validation

• npm run build (both packages) — ✅ npm-package tsc build + extension webpack bundle succeed; dist/runtime.json is emitted.
• npm run test:unit --w=@microsoft/kiota — ✅ 11 suites / 18 tests pass.
• npm run lint — ✅ 0 errors (only pre-existing enum-naming warnings in types.ts).
• Integration tests were left for CI to exercise.

Note (from the original PR): if this package is consumed outside the webpack-bundled VS Code extension, ESM-only may be a breaking change for CommonJS consumers.

[github-code-quality]

Code Coverage Overview

Languages: C#

C# / code-coverage/dotnet

The overall coverage in commit c9d997a in the gavinbarron-npm-pack... branch is 72%. Coverage data for the main branch is not yet available.

Show a code coverage summary of the most covered files.

File	main	gavinbarron-npm-pack... c9d997a	+/-
/home/runner/wo...guageRefiner.cs	—	98%	—
/home/runner/wo...criptRefiner.cs	—	98%	—
/home/runner/wo...MethodWriter.cs	—	97%	—
/home/runner/wo...MethodWriter.cs	—	96%	—
/home/runner/wo...MethodWriter.cs	—	96%	—
/home/runner/wo...MethodWriter.cs	—	95%	—
/home/runner/wo...rs/GoRefiner.cs	—	94%	—
/home/runner/wo...KiotaBuilder.cs	—	90%	—
/home/runner/wo...ationService.cs	—	89%	—
/home/runner/wo...xGenerator.g.cs	—	75%	—

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_{Updated July 21, 2026 01:47 UTC}