karma-rollup-preprocessor

Karma preprocessor to bundle ES modules using Rollup. Current stable version 7.0.8 (last released 2021). Release cadence is sporadic with long gaps between major versions. Key differentiators: integrates Rollup into Karma test pipeline, supports all Rollup options, allows multiple configured preprocessors for different transpilation setups. Requires Rollup >=1.0.0 as peer dependency.