Fix Jest test failures with ESM-only @actions v3 packages

[Copilot]

Jest couldn't resolve @actions packages v3.x which are ESM-only ("type": "module" with import-only exports). Tests failed with "Cannot find module @actions/core" errors.

Changes

• Added @swc/jest transformer: Handles ESM-to-CommonJS transformation for JS files in node_modules
• Configured explicit module mappings: Maps bare specifiers like @actions/core to actual transpiled files Jest can resolve:

  moduleNameMapper: {
    "^@actions/core$": "<rootDir>/node_modules/@actions/core/lib/core.js",
    "^@actions/io$": "<rootDir>/node_modules/@actions/io/lib/io.js",
    "^@actions/io/lib/(.*)$": "<rootDir>/node_modules/@actions/io/lib/$1",
    // ... similar mappings for exec, http-client
  }

• Updated transformIgnorePatterns: Includes @actions/.+ so these ESM packages are transformed rather than ignored

Tests now pass with @actions v3 ESM packages. Only failures are expected missing codeql CLI executable.

Original prompt

Fix the failing GitHub Actions workflow npm-test (ubuntu-latest)
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 62470008691
Job URL: https://github.com/github/codeql-variant-analysis-action/actions/runs/21668478406/job/62470008691

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[Copilot]

Pull request overview

This PR fixes Jest test failures caused by ESM-only @actions v3 packages by adding SWC-based transformation and explicit module mappings. The primary issue was that Jest couldn't resolve @actions packages v3.x which use "type": "module" with import-only exports.

Changes:

• Added @swc/jest transformer to handle ESM-to-CommonJS transformation for JavaScript files in node_modules
• Configured explicit module name mappings for @actions packages to resolve bare specifiers to actual transpiled files
• Updated transformIgnorePatterns to include @actions packages for transformation

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
package.json	Added @swc/core, @swc/jest, jest-environment-node, and jest-resolve as devDependencies
package-lock.json	Added lockfile entries for new SWC dependencies and their platform-specific binaries
jest.config.ts	Configured module file extensions, added moduleNameMapper for @actions packages, added @swc/jest transformer for JS files, and updated transformIgnorePatterns to include @actions packages

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