Yarn workspaces "prepare" dependencies

[john-jjj]

What is the current behavior?

$ yarn -v
1.10.1
$ uname -a
[...]18.0.0 Darwin Kernel Version 18.0.0[...]
$ node -v
v10.10.0

We are using the workspace feature with a package.json at the root of the workspace looking like:

{
  "private": true,
  "workspaces": {
    "packages": [
      "A",
      "B"
    ],
    "nohoist": [
      "C",
    ]
  }
}

• Dependency graph

C -> A
C -> B

Each of A and B are TypeScript packages which uses the target prepare for compiling and then output a dist folder:

"scripts": {
    "compile": "/usr/local/bin/tsc",
    "clean": "rm -rf dist",
    "prepare": "yarn run compile"
 }

When changing A or B, we need to run a 2 steps process in order for those changes to be reflected in C:

$ cd A && yarn 
$ cd B && yarn
$ cd C && yarn upgrade A B && yarn

We do not understand why dependencies are not being updated by yarn while doing executing yarn in C. Do we really have to rebuild each of those, each time we make it change to them?

[courtyenn]

I am running into a very similar issue. I thought since they are using workspaces, yarn prepare would be run in each A and B.