Monorepo support

[FFdhorkin]

Currently, I have three package.json files - one at the workspace root, and two in sub-packages. I'd like to use package-changed from a script in the main package.json

For example (I am using pnpm):

./package.json (root folder):

{
    "scripts": {
        "package-changed": "package-changed run 'rm -f .eslintcache && pnpm install'"
    },
    "dependencies": {
        "subprojecta": "workspace:subprojecta",
        "subprojectb": "workspace:subprojectb"
    },
    "devDependencies": {
        "eslint": "^8.50.0",
        "husky": "^8.0.3",
        "package-changed": "^3.0.0"
   }
}

./subprojecta/package.json

{
    "devDependencies": {
       "typescript": "^5.2.2"
   }
}

./subprojectb/package.json

{
    "devDependencies": {
        "next": "^13.5.4"
   }
}

If the main package.json changes, or either of the subproject package.jsons change, I want the package-changed task to run.

I think this would be relatively simple, all things considered. Trickiest part would be detecting the workspaces in the first place (i.e. changes to src/find-package.ts). After that, I think it'd just require src/get-package-hash.ts to concatenate the various package.json files before hashing.

As an alternative to searching for multiple package.json files, there could also just be explicit cli-provided paths, e.g.
"package-changed": "package-changed --package ./package.json --package ./subprojecta/package.json --package ./subprojectb/package.json run 'rm -f .eslintcache && pnpm install'"

Right now, I think the only existing options are to either:

• have separate package-changed scripts in each subproject and a script at the root that runs both
• use the js api to manually run on multiple cwd

[FFdhorkin]

As a side note, this might be a potential use case for the --lockfile flag discussed in #14