rollup-plugin-cjs-check

A Rollup plugin that automatically verifies CommonJS output compatibility with Node.js's cjs-module-lexer. Currently at v1.0.3, with stable release cadence. It analyzes the generated CJS bundle and compares the exports detected by Rollup against those that cjs-module-lexer would detect, flagging mismatches that cause broken named imports in Node.js ESM. Unlike manual testing, this provides automated CI enforcement. Requires Rollup >=1.20.0 and Node >=14.0.0.