Migrate to ESM and upgrade dependencies

[priyagupta108]

Description:
Convert to ESM, update imports/tests/configs for ESM, and bump dependencies.

Related issue:
Add link to the related issue.

Check list:

• Ran npm run check locally (format, lint, build, test) and all checks pass.
• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

This PR migrates actions/setup-java to ESM (to support newer @actions/* packages), updates the TypeScript/Jest/ESLint/Prettier configuration accordingly, and bumps dependencies with an accompanying major-version release note.

Changes:

• Switch TypeScript output and internal imports to ESM-friendly NodeNext + explicit .js specifiers.
• Replace legacy Jest/ESLint/Prettier configs with ESM/flat-config equivalents and update tests for ESM mocking.
• Bump dependencies (including @actions/*) and update Licensed metadata; bump package version to 6.0.0 with README breaking-change note.

Reviewed changes

Copilot reviewed 86 out of 96 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tsconfig.json	Moves TS compilation settings toward ESM (ES2022 + NodeNext) and adjusts excludes.
src/util.ts	Updates local imports to ESM-style .js specifiers.
src/toolchains.ts	Updates local imports to ESM-style .js specifiers.
src/setup-java.ts	Updates imports for ESM and replaces __dirname usage with import.meta.url-based pathing.
src/maven-args.ts	Updates local imports to ESM-style .js specifiers.
src/gpg.ts	Updates util import for ESM and adjusts ExecOptions import path.
src/distributions/zulu/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/temurin/installer.ts	Updates internal imports to ESM-style .js specifiers and improves thrown errors with cause.
src/distributions/semeru/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/sapmachine/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/oracle/installer.ts	Updates internal imports to ESM-style .js specifiers and adds models import needed for ESM.
src/distributions/microsoft/installer.ts	Updates internal imports/exports to ESM-style .js specifiers and improves thrown errors with cause.
src/distributions/local/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/liberica/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/kona/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/jetbrains/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/graalvm/installer.ts	Updates internal imports to ESM-style .js specifiers and improves thrown errors with cause.
src/distributions/dragonwell/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/distribution-factory.ts	Updates distribution factory imports to ESM-style .js specifiers.
src/distributions/corretto/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/base-installer.ts	Updates internal imports to ESM-style .js specifiers.
src/distributions/adopt/installer.ts	Updates internal imports to ESM-style .js specifiers.
src/cleanup-java.ts	Converts cleanup entrypoint to ESM and updates main-module detection logic (needs a robustness tweak).
src/auth.ts	Updates internal imports to ESM-style .js specifiers.
README.md	Documents breaking change for v6: migration to ESM.
package.json	Bumps to 6.0.0, sets "type": "module", updates scripts for ESM Jest, and upgrades dependencies.
jest.config.ts	Introduces TS-based ESM Jest configuration (ts-jest useESM).
jest.config.js	Removes legacy CJS Jest config.
eslint.config.mjs	Adds ESLint flat config for TS + Jest in an ESM-compatible format.
dist/setup/package.json	Marks dist/setup package as ESM (type: module).
dist/cleanup/package.json	Marks dist/cleanup package as ESM (type: module).
.prettierrc.json	Replaces JS Prettier config with JSON config compatible with ESM setup.
.prettierrc.js	Removes legacy JS Prettier config.
.licenses/npm/strnum.dep.yml	Updates Licensed record for strnum version bump.
.licenses/npm/semver.dep.yml	Updates Licensed record for semver version bump.
.licenses/npm/semver-6.3.1.dep.yml	Removes old Licensed record for legacy semver version.
.licenses/npm/path-expression-matcher.dep.yml	Updates Licensed record for path-expression-matcher version bump.
.licenses/npm/minimatch-3.1.5.dep.yml	Adds/updates Licensed record for minimatch@3.1.5.
.licenses/npm/minimatch-10.2.5.dep.yml	Adds Licensed record for minimatch@10.2.5 (Blue Oak license).
.licenses/npm/js-yaml.dep.yml	Updates Licensed record for js-yaml version bump.
.licenses/npm/is-unsafe.dep.yml	Updates Licensed record content to match the new dependency (is-unsafe).
.licenses/npm/fast-xml-parser.dep.yml	Updates Licensed record for fast-xml-parser version bump.
.licenses/npm/fast-xml-builder.dep.yml	Updates Licensed record for fast-xml-builder version bump.
.licenses/npm/brace-expansion-5.0.7.dep.yml	Adds Licensed record for brace-expansion@5.0.7.
.licenses/npm/brace-expansion-1.1.15.dep.yml	Updates Licensed record for brace-expansion 1.x version bump.
.licenses/npm/balanced-match-4.0.4.dep.yml	Adds Licensed record for balanced-match@4.0.4.
.licenses/npm/balanced-match-1.0.2.dep.yml	Adds Licensed record for balanced-match@1.0.2.
.licenses/npm/anynum.dep.yml	Updates Licensed record for anynum version bump.
.licenses/npm/@typespec/ts-http-runtime.dep.yml	Updates Licensed record for @typespec/ts-http-runtime version bump.
.licenses/npm/@azure/storage-common.dep.yml	Updates Licensed record for @azure/storage-common version bump.
.licenses/npm/@azure/storage-blob.dep.yml	Updates Licensed record for @azure/storage-blob version bump.
.licenses/npm/@azure/core-xml.dep.yml	Updates Licensed record for @azure/core-xml version bump.
.licenses/npm/@azure/core-rest-pipeline.dep.yml	Updates Licensed record for @azure/core-rest-pipeline version bump.
.licenses/npm/@azure/core-http-compat.dep.yml	Updates Licensed record for @azure/core-http-compat version bump.
.licenses/npm/@azure/core-client.dep.yml	Updates Licensed record for @azure/core-client version bump.
.licenses/npm/@azure/abort-controller.dep.yml	Adds Licensed record for @azure/abort-controller@2.1.2.
.licenses/npm/@actions/tool-cache.dep.yml	Updates Licensed record for @actions/tool-cache version bump.
.licenses/npm/@actions/io.dep.yml	Updates Licensed record for @actions/io version bump.
.licenses/npm/@actions/http-client.dep.yml	Updates Licensed record for @actions/http-client version bump.
.licenses/npm/@actions/glob-0.7.0.dep.yml	Adds Licensed record for @actions/glob@0.7.0.
.licenses/npm/@actions/glob-0.6.1.dep.yml	Updates Licensed record for @actions/glob prior version metadata.
.licenses/npm/@actions/exec.dep.yml	Updates Licensed record for @actions/exec version bump.
.licenses/npm/@actions/core.dep.yml	Updates Licensed record for @actions/core version bump.
.licenses/npm/@actions/cache.dep.yml	Updates Licensed record for @actions/cache version bump.
.licensed.yml	Updates allowed/reviewed licenses list for new transitive licenses.
.eslintrc.js	Removes legacy ESLint config in favor of flat config.
.eslintignore	Removes legacy ignore file (handled via flat-config ignores).
tests/util.test.ts	Refactors tests for ESM + jest.unstable_mockModule usage.
tests/toolchains.test.ts	Refactors tests for ESM + dynamic imports after mocking.
tests/maven-args.test.ts	Refactors core mocking pattern for ESM.
tests/gpg.test.ts	Refactors tests for ESM + dynamic imports after mocking.
tests/distributors/zulu-windows-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/zulu-linux-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/zulu-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/temurin-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/semeru-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/sapmachine-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/oracle-installer.test.ts	Refactors to ESM mocking and dynamic imports after mocking.
tests/distributors/microsoft-installer.test.ts	Refactors to ESM mocking (including os/fs module mocking) and JSON import attributes.
tests/distributors/local-installer.test.ts	Refactors to ESM mocking and dynamic imports after mocking.
tests/distributors/liberica-windows-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/liberica-linux-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/liberica-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/kona-installer.test.ts	Updates source import path for ESM; JSON import style needs alignment with the rest of the ESM test suite.
tests/distributors/jetbrains-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/graalvm-installer.test.ts	Major refactor to ESM mocking patterns and dynamic imports.
tests/distributors/dragonwell-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/corretto-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/distributors/base-installer.test.ts	Refactors to ESM mocking and dynamic imports after mocking.
tests/distributors/adopt-installer.test.ts	Refactors to ESM mocking and JSON import attributes.
tests/cleanup-java.test.ts	Refactors cleanup tests to ESM mocking and dynamic imports after mocking.
tests/cache.test.ts	Refactors cache tests to ESM mocking and dynamic imports after mocking.
tests/auth.test.ts	Refactors auth tests to ESM mocking and dynamic imports after mocking.

Comments suppressed due to low confidence (1)

src/cleanup-java.ts:60

• The ESM main-module check is brittle: process.argv[1] can be a relative path (e.g. node dist/cleanup/index.js) or differ by path normalization/symlinks, causing run() to be skipped even when this file is the entrypoint. Consider normalizing both sides (e.g., resolve process.argv[1] to an absolute path and compare to fileURLToPath(import.meta.url), or compare file URLs via pathToFileURL(path.resolve(process.argv[1]))).

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