Migrate to ESM and upgrade dependencies

[gowridurgad]

Description:
Migrates setup-node from CommonJS to ECMAScript Modules (ESM)

Related issue:
Add link to the related issue.

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

This PR migrates the setup-node codebase and tooling from CommonJS to ESM, aligning runtime behavior (NodeNext resolution + import.meta.url) with updated dependencies and ESM-compatible lint/test configuration.

Changes:

• Switch TypeScript compilation to module: NodeNext and update internal relative imports to include .js extensions.
• Migrate Jest and ESLint configuration to ESM-friendly setups (flat ESLint config + TS Jest config + ESM mocking patterns).
• Upgrade Actions/toolkit and related dependencies, and refresh licensed metadata accordingly.

Reviewed changes

Copilot reviewed 73 out of 85 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tsconfig.json	Switch TS module output to NodeNext and exclude jest config from compilation.
src/util.ts	Update catch clause style while keeping behavior unchanged.
src/setup-node.ts	Update entrypoint import to ESM-friendly .js specifier.
src/main.ts	Convert internal imports to .js and replace __dirname usage with import.meta.url resolution.
src/distributions/v8-canary/canary_builds.ts	Update internal imports to .js specifiers.
src/distributions/rc/rc_builds.ts	Update internal imports to .js specifiers.
src/distributions/official_builds/official_builds.ts	Update internal imports to .js specifiers.
src/distributions/nightly/nightly_builds.ts	Update internal imports to .js specifiers.
src/distributions/installer-factory.ts	Update internal imports to .js specifiers.
src/distributions/base-distribution.ts	Update imports for ESM and replace __dirname usage with import.meta.url resolution.
src/distributions/base-distribution-prerelease.ts	Update internal imports to .js specifiers.
src/cache-utils.ts	Update internal import to .js and fix async command output usage (await).
src/cache-save.ts	Update internal imports to .js specifiers.
src/cache-restore.ts	Update internal imports to .js specifiers.
package.json	Mark package as ESM, update scripts, and upgrade dependencies/tooling.
jest.config.ts	Add ESM-compatible Jest configuration using ts-jest with useESM.
jest.config.js	Remove legacy CommonJS Jest configuration.
eslint.config.mjs	Add flat ESLint config in ESM format.
dist/setup/package.json	Add package boundary metadata for the bundled setup entrypoint.
dist/cache-save/package.json	Add package boundary metadata for the bundled post-action entrypoint.
.prettierrc.json	Add Prettier configuration in JSON format.
.prettierrc.js	Remove legacy CommonJS Prettier configuration.
.licensed.yml	Update allowed/reviewed licenses and normalize indentation for reviewed packages.
.eslintrc.js	Remove legacy ESLint config (replaced by flat config).
.eslintignore	Remove legacy ignore file (handled via flat config ignores).
tests/rc-installer.test.ts	Update tests for ESM execution + ESM-safe mocking/import patterns.
tests/problem-matcher.test.ts	Update tests to use ESM JSON import attributes and Jest globals.
tests/official-installer.test.ts	Update tests for ESM execution + ESM-safe mocking/import patterns.
tests/nightly-installer.test.ts	Update tests for ESM execution + ESM-safe mocking/import patterns.
tests/mock/glob-mock.test.ts	Update internal test import to .js specifier and Jest globals.
tests/main.test.ts	Update tests for ESM execution + ESM-safe mocking/import patterns.
tests/canary-installer.test.ts	Update tests for ESM execution + ESM-safe mocking/import patterns.
tests/cache-utils.test.ts	Update tests to mock @actions/exec.getExecOutput and align with async command execution.
tests/cache-save.test.ts	Update tests for ESM execution + ESM-safe mocking/import patterns.
tests/cache-restore.test.ts	Update tests for ESM execution + ESM-safe mocking/import patterns.
tests/authutil.test.ts	Update tests for ESM execution + ESM-safe mocking/import patterns.
.licenses/npm/xml-naming.dep.yml	Normalize license metadata formatting (homepage field).
.licenses/npm/wrappy.dep.yml	Remove license metadata entry (dependency resolution changed).
.licenses/npm/universal-user-agent.dep.yml	Update license metadata to match upgraded dependency version/content.
.licenses/npm/strnum.dep.yml	Update license metadata formatting/version alignment.
.licenses/npm/semver.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/semver-6.3.1.dep.yml	Remove old semver v6 license metadata entry.
.licenses/npm/once.dep.yml	Remove license metadata entry (dependency resolution changed).
.licenses/npm/minimatch-3.1.5.dep.yml	Add license metadata for additional minimatch version present in resolution.
.licenses/npm/minimatch-10.2.5.dep.yml	Add license metadata for upgraded minimatch version present in resolution.
.licenses/npm/json-with-bigint.dep.yml	Update license metadata to match dependency name/version/copyright.
.licenses/npm/fast-xml-parser.dep.yml	Update license metadata formatting/version alignment.
.licenses/npm/fast-content-type-parse.dep.yml	Update license metadata to match new dependency and reviewed status.
.licenses/npm/deprecation.dep.yml	Remove license metadata entry (dependency resolution changed).
.licenses/npm/brace-expansion-5.0.6.dep.yml	Update license metadata to match resolved dependency content.
.licenses/npm/brace-expansion-1.1.13.dep.yml	Add license metadata for additional brace-expansion version present in resolution.
.licenses/npm/before-after-hook.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/balanced-match-4.0.4.dep.yml	Add license metadata for additional balanced-match version present in resolution.
.licenses/npm/balanced-match-1.0.2.dep.yml	Add license metadata for additional balanced-match version present in resolution.
.licenses/npm/@typespec/ts-http-runtime.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/types.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/types-13.10.0.dep.yml	Remove old @octokit/types license metadata entry.
.licenses/npm/@octokit/request.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/request-error.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/plugin-rest-endpoint-methods.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/plugin-paginate-rest.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/openapi-types.dep.yml	Update license metadata to match upgraded dependency version/content.
.licenses/npm/@octokit/graphql.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/endpoint.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/core.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@octokit/auth-token.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@nodable/entities.dep.yml	Update license metadata formatting/version alignment.
.licenses/npm/@azure/storage-common.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@azure/storage-blob.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@azure/core-xml.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@azure/core-rest-pipeline.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@azure/core-http-compat.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@azure/abort-controller.dep.yml	Add license metadata for newly present dependency in resolution.
.licenses/npm/@actions/tool-cache.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@actions/io.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@actions/http-client-4.0.1.dep.yml	Update license metadata to match upgraded dependency version/content.
.licenses/npm/@actions/glob-0.7.0.dep.yml	Update license metadata to match upgraded dependency version/content.
.licenses/npm/@actions/glob-0.6.1.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@actions/github.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@actions/exec.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@actions/core.dep.yml	Update license metadata to match upgraded dependency version.
.licenses/npm/@actions/cache.dep.yml	Update license metadata to match upgraded dependency version.

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