For each .js file under src, creates a corresponding .js.flow file under dist; these files are included in the published NPM packages, so that codebases can consume the Flow types. This script is invoked via yarn run build-flow (and also yarn run build).

Compiles .js files under src using Babel, writing the output to dist. This script is invoked via yarn run build-js (and also yarn run build).

Prettifies the code base, or tests that it is already prettified. This script is invoked for these two purposes respectively via yarn run pretty and yarn run pretty-check (and also npm test).

.build.* - used for project references .base.* - used for extends for downstream tsconfigs