babel-test

An opinionated library for testing Babel plugins with Jest or Mocha, using fixture files instead of snapshots. Current stable version is 0.2.4 (last released October 2020, low release cadence). Integrates with Jest's snapshot feature to auto-update fixture outputs on keypress, avoiding manual copy-paste. Simpler API than alternatives like @babel/helper-plugin-test-runner or babel-plugin-tester; focuses on directory-based fixtures with code.js/output.js/error.js pattern. Ships TypeScript types.