Betterer: Incremental Improvement
summary
Claims an incremental, measurable migration workflow by turning code health into a fitness function and stores serialized fitness snapshots in the repo. Built tool Betterer runs tests that start broken by design, compares results over time, attaches per-file issues with positions, and integrates with CI and pre-commit to block regressions. Example flow: baseline finds 9 JS files, an update bumps it to 10, a later contributor fixes 2 and the results file updates. Works with ESLint/prettier, Axe, Jest and automatic migrations.
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chapters (4)
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