Introducing Lage

Overview

Your JS repo has gotten large enough that you have turned to using a tool to help you manage multiple packages inside a repository. That's great! However, you realized quickly that the tasks defined inside the workspace have to be run in package dependency order.

Lerna, Rush, wsrun and even pnpm will provide a simple way for you to run npm scripts to be run in a topological order. However, these tools will force you to run your tasks by script name one at a time. For example, all the build scripts will have to run first. Then all the test scripts run in the topological order.

This usually means that there are wasted CPU cycles in between build and test. We can achieve better pipelining the npm scripts if we had a way to say that test can run as soon as build are done for the package.

lage (Norwegian for "make", pronounced law-geh) solves this by providing a terse pipelining syntax. It has features specifically address large monorepos with high number of packages:

• package and task scopes
• output caching
• sound scheduling with package task pipeline
• prioritization