Integration with Rush: how to use with no root package.json file?

Problem

I’m exploring integrating the changeset tool into a Rush monorepo.

In a Rush monorepo, there is no root package.json (it’s generally forbidden and/or discouraged), and instead all of the paths for your individual projects are stored in a root rush.json file.

I’m not sure exactly what package or tool is looking for the root package:

❯ changeset
🦋  error NoPkgJsonFound [Error]: No package.json could be found upwards from the directory /Users/enelson/dev/rushstack2
🦋  error     at _callee4$ (/Users/enelson/.nvm/versions/node/v16.15.0/lib/node_modules/@changesets/cli/node_modules/@manypkg/find-root/dist/find-root.cjs.dev.js:217:19)
🦋  error     at tryCatch (/Users/enelson/.nvm/versions/node/v16.15.0/lib/node_modules/@changesets/cli/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:44:17)
🦋  error     at Generator.<anonymous> (/Users/enelson/.nvm/versions/node/v16.15.0/lib/node_modules/@changesets/cli/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:125:22)
🦋  error     at Generator.next (/Users/enelson/.nvm/versions/node/v16.15.0/lib/node_modules/@changesets/cli/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:69:21)
🦋  error     at asyncGeneratorStep (/Users/enelson/.nvm/versions/node/v16.15.0/lib/node_modules/@changesets/cli/node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:24)
🦋  error     at _next (/Users/enelson/.nvm/versions/node/v16.15.0/lib/node_modules/@changesets/cli/node_modules/@babel/runtime/helpers/asyncToGenerator.js:22:9) {
🦋  error   directory: '/Users/enelson/dev/rushstack2'
🦋  error }

Proposed solution

I think first off, if I could get it to the point where at least it is not erroring, maybe I would be able to add a changeset if I explicitly told it what package it was? But ideally, I could add code to get the package list from rush.json projects: [] field, and pass that into changeset to inform it of the projects in the repo.

[Andarist]

The type that you have to return from get-packages is this:

export declare type Packages = {
    tool: Tool;
    packages: Package[];
    root: Package;
};

So it seems likely that you need to “fake” the root here - it has to contain .packageJson. I think that it’s likely that you end up with a crash here: https://github.com/changesets/changesets/blob/e02a0c4b7ec869d21b10495138d9fb193b213917/packages/get-dependents-graph/src/get-dependency-graph.ts#L67

[elliot-nelson]

Bingo! It works. I’ll play with it and put up a PR this weekend possibly.