Lerna is a fast, modern build system for managing and publishing multiple JavaScript/TypeScript packages from the same repository. Lerna是一个快速、现代的构建系统，用于管理和发布来自同一资源库的多个JavaScript/TypeScript包。
copy form Lerna Introduction It solves three of the biggest problems of JavaScript monorepos:
- Lerna links different projects within the repo, so they can import each other without having to publish anything to NPM.
- Lerna runs a command against any number of projects, and it does it in the most efficient way, in the right order, and with the possibility to distribute that on multiple machines.
- Lerna manages your publishing process, from version management to publishing to NPM, and it provides a variety of options to make sure any workflow can be accommodated.
npm install --global lerna
lerna
A tool for managing JavaScript projects with multiple packages.
More information: https://lerna.js.org.
- Initialize project files (lerna.json, package.json, .git, etc.):
lerna init
- Install all external dependencies of each package and symlink together local dependencies:
lerna bootstrap
- Run a specific script for every package that contains it in its package.json:
lerna run script
- Execute an arbitrary shell command in every package:
lerna exec -- ls
- Publish all packages that have changed since the last release:
lerna publish