esmod

esmod is a fast in-place transpiler for converting ES6 import/export statements to CommonJS require/exports. Version 1.0.0 is currently stable, with a focus on speed by leveraging AST-based transformation rather than regex-only approaches. It distinguishes itself from tools like esbuild or Babel by being designed for lightweight, single-file transformations without module resolution or bundling — ideal for build tool authors and custom pipelines.