From microrepos to monorepo: thrilling adventures in refactoring

" summary

Describes polypoly’s experience converting many microrepos into a 25+-module monorepo containing Javascript/Typescript code plus iOS and Android apps, and the tooling and CI used to speed builds and tests. Explains their zero-dependency build/test tool (build.js) and a set of GitHub Actions used to accelerate testing, enforce Fast (F.I.R.S.T.) tests, and handle cross-language and implicit dependency challenges. Covers what build.js already improves, planned next steps for faster tests and implicit dependency handling, and monorepo build best practices for JS/TS projects.

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