Calm gutted a 10-year-old Rush.js monorepo and came out faster, cleaner, and way less tangled. The team dropped transpilation, ditched source maps, and went all-in on Node type stripping with native ESM. Local dev sped up by 30–40%. CI jobs? 3–6 minutes faster.
The overhaul hit everything: killed stubbed modules, refactored 1,000+ test cases, rewired import paths and extensions, and cracked down with strict ESLint rules.
