build(build-tools): modernize test tsconfig to node16/es2022

[tylerbutler]

Description

Replaces the long-stale build-tools/packages/build-tools/src/test/tsconfig.json (~70 lines of commented-out /* Basic Options */ boilerplate, targeting es2018/commonjs) with a clean modern config aligned with the package's main tsconfig.json:

• target: es2022
• module: node16 / moduleResolution: node16
• types: ["node", "mocha"]
• incremental: true

Incidental dynamic-import fix

src/test/biome2Config.test.ts had a handful of await import("../common/biome2Config") calls without the .js extension. Under node16/ESM dynamic imports those must include the extension, so each is updated to await import("../common/biome2Config.js"). (Same convention as the regular static imports already touched in #27375.)

Validation

From build-tools/packages/build-tools:

• pnpm run build:test — clean compile.
• pnpm test:mocha — 137/137 passing.

Reviewer Guidance

The review process is outlined on this wiki page.

Mechanical cleanup. The new tsconfig matches conventions used by every modern test project in this repo. The deleted commented-out options are TypeScript defaults / unused.

[github-actions]

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[Copilot]

Pull request overview

Modernizes the @fluidframework/build-tools test TypeScript configuration to match the package’s Node16/ES2022 compilation model and updates internal/test import specifiers to be Node16-friendly (including dynamic import() requiring explicit .js extensions).

Changes:

• Replace the stale test tsconfig.json with a minimal es2022 + module/moduleResolution: node16 configuration.
• Add explicit .js extensions to relative imports/exports across build-tools sources and tests (including dynamic imports in biome2Config tests).
• Align build-tools internal module specifiers with Node16 resolution expectations.

Reviewed changes

Copilot reviewed 51 out of 51 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
build-tools/packages/build-tools/src/test/tsconfig.json	Modernize test TS config to es2022 + node16 module settings.
build-tools/packages/build-tools/src/test/taskDefinitions.test.ts	Add .js extensions to relative imports used by tests.
build-tools/packages/build-tools/src/test/repoRootToken.test.ts	Add .js extension to config import.
build-tools/packages/build-tools/src/test/npmPackage.test.ts	Add .js extensions to relative imports.
build-tools/packages/build-tools/src/test/globPatterns.test.ts	Add .js extensions to relative imports.
build-tools/packages/build-tools/src/test/biomeVersion.test.ts	Add .js extensions to relative imports.
build-tools/packages/build-tools/src/test/biomeConfig.test.ts	Add .js extensions to relative imports.
build-tools/packages/build-tools/src/test/biome2Config.test.ts	Fix dynamic imports to include .js extensions under Node16 resolution.
build-tools/packages/build-tools/src/index.ts	Add .js extensions to re-exports to match emitted JS layout.
build-tools/packages/build-tools/src/fluidBuild/tscUtils.ts	Add .js extension for local import.
build-tools/packages/build-tools/src/fluidBuild/tasks/workers/workerPool.ts	Add .js extension for worker type import.
build-tools/packages/build-tools/src/fluidBuild/tasks/workers/worker.ts	Add .js extensions for worker module imports.
build-tools/packages/build-tools/src/fluidBuild/tasks/workers/eslintWorker.ts	Add .js extension for worker type import.
build-tools/packages/build-tools/src/fluidBuild/tasks/taskUtils.ts	Add .js extensions for common imports.
build-tools/packages/build-tools/src/fluidBuild/tasks/taskHandlers.ts	Add .js extensions for type imports.
build-tools/packages/build-tools/src/fluidBuild/tasks/taskFactory.ts	Add .js extensions throughout task factory imports.
build-tools/packages/build-tools/src/fluidBuild/tasks/task.ts	Add .js extensions for task dependencies.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/webpackTask.ts	Add .js extensions for task utils / leaf base import.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/tscTask.ts	Add .js extensions for task dependencies.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/ts2EsmTask.ts	Add .js extensions for task utils / leaf base import.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/prettierTask.ts	Add .js extensions for task dependencies.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/miscTasks.ts	Add .js extensions for task dependencies.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/lintTasks.ts	Add .js extensions for task dependencies.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/leafTask.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/generateEntrypointsTask.ts	Add .js extensions for task dependencies.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/flubTasks.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/declarativeTask.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/tasks/leaf/biomeTasks.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/tasks/groupTask.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/options.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/npmDepChecker.ts	Add .js extension for common import.
build-tools/packages/build-tools/src/fluidBuild/fluidUtils.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/fluidTsc/fluidTsc.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/fluidTaskDefinitions.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/fluidBuild/fluidRepoBuild.ts	Add .js extensions for internal/common imports.
build-tools/packages/build-tools/src/fluidBuild/fluidRepo.ts	Add .js extensions for internal/common imports.
build-tools/packages/build-tools/src/fluidBuild/fluidBuildConfig.ts	Add .js extension for internal import.
build-tools/packages/build-tools/src/fluidBuild/fluidBuild.ts	Add .js extensions for internal/common imports.
build-tools/packages/build-tools/src/fluidBuild/fileHashCache.ts	Add .js extension for hash import.
build-tools/packages/build-tools/src/fluidBuild/buildMetrics.ts	Add .js extension for logging import.
build-tools/packages/build-tools/src/fluidBuild/buildGraph.ts	Add .js extensions for internal/common imports.
build-tools/packages/build-tools/src/fluidBuild/buildContext.ts	Add .js extensions for internal/common type imports.
build-tools/packages/build-tools/src/common/typeTests.ts	Add .js extension for common type import.
build-tools/packages/build-tools/src/common/timer.ts	Add .js extension for logging import.
build-tools/packages/build-tools/src/common/npmPackage.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/common/monoRepo.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/common/logging.ts	Add .js extension for internal import.
build-tools/packages/build-tools/src/common/gitRepo.ts	Add .js extension for utils import.
build-tools/packages/build-tools/src/common/biomeConfigUtils.ts	Add .js extension for GitRepo type import (and dynamic imports already use .js).
build-tools/packages/build-tools/src/common/biomeConfig.ts	Add .js extensions for internal imports.
build-tools/packages/build-tools/src/common/biome2Config.ts	Add .js extensions for internal imports.