yarn global bin not equal to npm global bin

[nueko]

Halo,
On my windows machine, yarn global bin is not equal to npm bin -g

Thanks.

[voxsim]

@nueko could you please provide additional information?

[rally25rs]

Unable to reproduce. Please provide more configuration information.
For example, what versions on NPM and Yarn? How did you install Node/NPM? How did you install Yarn?

On Windows 10:

> npm bin -g
C:\Program Files (x86)\Nodist\bin

> yarn global bin
C:\Program Files (x86)\Nodist\bin

> npm --version
3.9.5

> yarn --version
0.23.2

On OSX:

$ npm bin -g
/Users/me/.nvm/versions/node/v6.3.0/bin

$ yarn global bin
/Users/me/.nvm/versions/node/v6.3.0/bin

$ npm --version
3.10.3

$ yarn --version
0.23.3

[ok2ju]

@rally25rs @voxsim

macOS 10.12.4

$ node -v
v7.9.0

$ npm --version
4.2.0

$ yarn --version
0.23.4

$ npm bin -g
/usr/local/bin

$ yarn global bin
/usr/local/Cellar/node/7.9.0/bin

[rally25rs]

Ah so you have Yarn installed with Homebrew. I think this is possibly related to: #3078 and #3255 and #3142 and #1040

It looks like the brew-installed node has it's global bin mapped to /usr/local/bin but Yarn doesn't pick that up when setting its own bin.

3142 mentions that you can do:

yarn global bin # /usr/local/Cellar/node/7.9.0/bin
yarn config set prefix /usr/local/
yarn global bin # /usr/local/bin

---

Here is the code that gets the "prefix":

function getGlobalPrefix(config: Config, flags: Object): string {
  if (flags.prefix) {
    return flags.prefix;
  } else if (config.getOption('prefix')) {
    return String(config.getOption('prefix'));
  } else if (process.env.PREFIX) {
    return process.env.PREFIX;
  } else if (process.platform === 'win32') {
    if (process.env.LOCALAPPDATA) {
      return path.join(process.env.LOCALAPPDATA, 'Yarn', 'bin');
    }
    // c:\node\node.exe --> prefix=c:\node\
    return path.dirname(process.execPath);
  } else {
    // /usr/local/bin/node --> prefix=/usr/local
    let prefix = path.dirname(path.dirname(process.execPath));

    // destdir only is respected on Unix
    if (process.env.DESTDIR) {
      prefix = path.join(process.env.DESTDIR, prefix);
    }

    return prefix;
  }
}

So it looks like you can set the config option as I mention above, or set a PREFIX env variable.
Otherwise it looks like it falls back to the install path that node executes from which would explain why yours points to a homebrew install directory.

---

Question for the Yarn core team; Is there a reason Yarn doesn't just execute npm config get prefix and use the output?

[nueko]

this fixed on 0.23.4 and yarn config set prefix $(npm config get prefix)
on 0.23.3, yarn config set prefix $(npm config get prefix) didn't fix the issue.