如何将范围名称传递给 lerna 命令动态？

Question

I use lerna to manage projects and dev command exists in some projects. For exmaple, A and B have command dev to start project. I must write two command in root project:

{
 "dev:A":"lerna exec --scope A -- yarn dev",
 "dev:B":"lerna exec --scope B -- yarn dev"
}

It's there anyway to run like this:

yarn dev A

I try but it's failure. The scope name is pass to yarn dev not lerna.

{
 "dev":"lerna exec --scope $1 -- yarn dev",
}

Answer 1

Forget it. I see the answer and the command "lerna exec 'yarn dev' --scope" works.

Answer 2

The executable is not yarn, but lerna. You want the command to be

lerna run dev --scope xyz

So either install it globally and call it like that, or install it as a project dependency and then

yarn lerna -- run dev --scope ...
# or 
`npm run lerna -- run dev --scope ...`

or use npx lerna run dev --scope ... to run it globally without explicit install.

Why that way?

Because yarn <bin> / npm run <bin> executes the bin as if you'd call it directly, and the -- seperates arguments to yarn/npm from arguments to the bin you called. More recent yarns will allow you to drop the -- and figure them out automagically.

I'm not sure if you really need to use yarn dev instead of simply dev in the lerna part of the script, as lerna does just that -- walk all projects, look up if any project has a dev script and executes it (if you use --scope , it will of course only look up the given project(s)...). You might need it with yarn less it calls the commands in the sub-packages using npm instead, but I didn't check that, as our company uses npm.

A package.json including

{
  "scripts": { "dev": "lerna run dev --scope x" }
}

does the same thing if you launch it with yarn dev .

If you want to call the lerna-dev script with more arguments, you can always go for yarn dev -- --include-dependencies in the terminal, which will append all arguments after dev to lerna instead of yarn, in this example resulting in yarn lerna -- dev --scope x --include-dependencies