bcoe/c8

Health v2 · maintenance only

Adoption not part of the score

2122 stars · 100 forks observed · 2026-10-08

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

c8 is a CLI tool that generates code coverage reports for Node.js applications using Node's built-in V8 coverage output, formatted with Istanbul-compatible reporters. It works like nyc but requires no transpilation, simply wrapping any node command (e.g. `c8 node foo.js`).

Use cases

• measure code coverage of node.js tests
• generate istanbul-style coverage reports without transpiling
• enforce coverage thresholds in CI
• check per-file coverage thresholds
• include untested files in coverage reports with --all

When to choose

• you want fast, native V8 coverage for modern JavaScript without instrumentation/transpilation
• you need Istanbul-compatible reporters (lcov, html, text) for Node.js projects
• you want to enforce coverage thresholds in CI pipelines

When to avoid

• you need coverage for browser-only code or non-Node runtimes
• you rely on nyc-specific instrumentation features or older Node versions lacking V8 coverage output
• you need coverage for languages other than JavaScript/TypeScript

Facets

cli-tool · maturity active

testing benchmarking testing developer-tools cli cross-platform code-coverage v8-coverage istanbul-reporters nyc-alternative javascript command-line nodejs

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