Migrate from Jest to Node.js native test runner

[RomiC]

Replace Jest with Node.js built-in test runner (node:test, node:assert/strict) and c8 for coverage. Also migrate from ESLint+Prettier to Oxlint+Oxfmt. Removes ~395 transitive dependencies.

Changes

Jest → node:test

• Replace jest.mock() with mock.method() from node:test
• Replace expect() assertions with node:assert/strict
• Replace jest.fn() with mock.fn()
• Rewrite feature test with async/await + Promise wrappers
• Delete jest.config.js, __mocks__/ directory
• Update CI workflow (npm run test:coverage, pin coveralls to v2.3.8)
• Update pre-push hook to use node --test

ESLint → Oxlint

• Replace eslint, eslint-config-prettier, eslint-plugin-prettier, prettier with oxlint + oxfmt
• Add oxlint.config.mjs and oxfmt.config.mjs (matching ya-disk project)
• Delete .eslintrc and .prettierrc
• Fix deprecated husky install command

Results

• 7 tests passing (5 unit + 2 integration)
• 100% coverage (100% branch — up from 70% with Jest)
• ~395 dev dependencies removed
• 0 vulnerabilities (down from 12)

[greptile-apps]

Greptile Summary

The PR replaces Jest with Node.js’s native test runner and c8 while updating test mocks, coverage reporting, CI, linting, and pre-push execution.

• Migrates unit and integration tests to node:test and node:assert/strict.
• Replaces Jest mocks with native mock APIs and removes Jest-specific configuration and fixtures.
• Moves integration-test output creation into suite setup so skipped tokenless runs no longer leave generated files.
• Updates package dependencies, scripts, CI coverage reporting, and development hooks.

Confidence Score: 5/5

The PR appears safe to merge.

The previously reported tokenless-run artifact is fixed because the output stream is now created only in the skipped suite's setup hook, and no blocking failure remains.

Important Files Changed

Filename	Overview
features/upload-and-download-file.feature.js	Migrates the integration suite to native test APIs and fixes the previously reported skipped-suite artifact by deferring output-file creation to the suite's before hook.
package.json	Replaces Jest scripts and dependencies with the Node.js test runner and c8 coverage.
specs/download.spec.js	Rewrites download tests using native assertions and scoped method mocks.
specs/followRedirect.spec.js	Rewrites redirect tests using native test and mock APIs.
specs/upload.spec.js	Rewrites upload tests using native assertions and scoped method mocks.
.github/workflows/npm-test.yml	Runs the coverage test command in CI and pins the Coveralls action version.

_{Reviews (3): Last reviewed commit: "Chore: Update CI workflow and pre-push h..." | Re-trigger Greptile}

[coveralls]

coverage: 100.0% (+9.4%) from 90.625% — migrate-to-node-test-runner into master