Documentation is here: https://microsoft.github.io/lage/
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 many features geared towards speeding up the task runner that we'll explore later.
lage gives you this capability with very little configuration. First, let's install the lage utility. You can place this in your workspace's root package.json by running yarn add:
yarn add -D lage
Confirm with yarn that you are sure to add a package at the root level, you then place a root level script inside the package.json to run lage:
{
"scripts": {
"build": "lage build",
"test": "lage test"
}
}
Add a configuration file in the root to get started. Create this file at the root lage.config.js:
module.exports = {
pipeline: {
build: ["^build"],
test: ["build"],
},
};Do not worry about the syntax for now. We will go over the configuration file in a coming section. You can now run this command:
$ lage test
lage will detect that you need to run build steps before tests are run.
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