esbuild-plugin-istanbul

An esbuild plugin that instruments JavaScript/TypeScript source code with Istanbul/nyc code coverage instrumentation during the build process. Version 0.3.0 is the current stable release; the package is updated infrequently with no fixed cadence. It works as an esbuild plugin, applying Istanbul's instrumentation to files matched by configurable filters and loaders (js, jsx, ts, tsx). Unlike alternatives that require Babel or Webpack, this plugin integrates directly with esbuild's fast build pipeline. It ships TypeScript definitions and supports both ESM and CJS environments. Key differentiator: native esbuild integration without additional transform steps.