This is my attempt to learn how to use Bazel as the build system for a monorepo.

I'm starting with Javascript and Typescript applications and libraries as I currently work in that ecosystem.

Install the dependencies first.

yarn

Build everything

yarn build

Build a package

yarn exec bazelisk -- build //path/to/package:target

Run an app

yarn exec bazelisk -- run //path/to/package:target

# examples
yarn exec bazelisk -- run //apps/javascript/no_deps:bin
yarn exec bazelisk -- run //apps/javascript/internal_deps:bin
yarn exec bazelisk -- run //apps/javascript/external_deps:bin
yarn exec bazelisk -- run //apps/typescript/no_deps:bin
yarn exec bazelisk -- run //apps/typescript/internal_deps:bin
yarn exec bazelisk -- run //apps/typescript/external_deps:bin

The root package.json file is important for bootstrapping all the dependencies used in the repo.

Most of the other package.json files are optional. They are only used if we are building a publishable package using the pkg_npm rule.

Bazel's Typescript support adds the workspace root as an import path so you can refer to local packages easily. See the path in tsconfig.json and the import in libs/typescript/internal_deps/index.ts for an example.

Bundling packages with rollup doesn't seem to work in all cases. I don't know why not.