ESM-only with updated @octokit dependencies

[lokesh755]

Summary

Migrate @actions/github to ESM-only (v9.0.0) to properly support @octokit/core v7's type exports and resolve TypeScript compilation issues.

Motivation

The v8.0.0 release upgraded @octokit dependencies but had broken TypeScript types because @octokit/core v7 is ESM-only and its type exports (OctokitOptions, OctokitPlugin) can only be properly imported using moduleResolution: "node16". Converting @actions/github to ESM resolves this.

Breaking Changes

• ESM-only: @actions/github v9.0.0 is now ESM-only
  • CommonJS consumers must use dynamic import():

    async function main() {
        const { getOctokit, context } = await import('@actions/github');
    }
    main();

Fixes: #2254

[Copilot]

Pull request overview

Converts @actions/github to an ESM-only package (v9.0.0) and updates Octokit type references to use the supported @octokit/core/types entrypoint.

Changes:

• Switch package publishing/runtime to ESM (type: module, exports, TS module/moduleResolution: node16, add .js extensions in internal imports).
• Fix public type references by importing Octokit types from @octokit/core/types.
• Update Jest config/tests and docs/release notes for the ESM-only breaking change.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/github/tsconfig.json	Switch TS emit/resolution to Node16 ESM semantics.
packages/github/src/utils.ts	Update local imports to .js and adjust Octokit type import path.
packages/github/src/internal/utils.ts	Adjust Octokit type import path to supported entrypoint.
packages/github/src/github.ts	Update local imports to .js and Octokit type imports.
packages/github/src/context.ts	Update local import to .js for ESM runtime compatibility.
packages/github/package.json	Mark package as ESM-only, add exports, bump version to 9.0.0, adjust test script.
packages/github/package-lock.json	Bump locked package version to 9.0.0.
packages/github/jest.config.js	Convert Jest config to ESM + enable ts-jest ESM mode and .js import mapping.
packages/github/tests/lib.test.ts	Update tests to ESM-friendly patterns (import.meta.url, no require).
packages/github/RELEASES.md	Document v9.0.0 breaking change and type fix.
packages/github/README.md	Document ESM-only usage and update examples.

Files not reviewed (1)

• packages/github/package-lock.json: Language not supported

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