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ts-monorepo

Setup

  • Code lives in projects under frontend/.
  • Projects can depend on each other via imports starting with : (ex: import foo from ':proj-01/foo';). This is configured via TS path mapping.
  • We are in the process of migrating to project references (once they are deeply cycle-free). So, projects can either have project references enabled (extend tsconfig.dts.json) or disabled (extend tsconfig.base.json).
  • This repo's configuration is representative, but it is on a much smaller scale. Internally, we have ~70k TS files across ~900 projects.
  • There is a mix of TS and JS files.

Build

  • Only for projects with project references enabled.
  • yarn tsc -b frontend/typescript/tsconfig.build.json builds to .tsbuild
  • Cached in CI for subsequent incremental builds. Timestamps for edited files are updated prior to build in order to signal changes to TS compiler.
  • We run tsc -b in parallel for better performance on cache misses.