[Bug] full-icu is not supported

• I’d be willing to implement a fix

Describe the bug

Yarn fails when I try to install full-icu. I am aware it’s builin in node v13 but my team would prefer to not install unstable node version.

To Reproduce

try {
  await yarn(`add`, `full-icu`, '--dev');
  expect(true).toBe(false);
} catch (error) {
  expect(error.toString()).not.toContain('Failed with errors');
}

Screenshots

Environment if relevant (please complete the following information):

• OS: OSX
• Node version 12.10.0
• Yarn version 2.0.0-rc.28

[arcanis]

I can’t check right now, but it seems like their postinstall script is somehow calling node /path/to/yarn add ..., which doesn’t work because it’s a shellscript. Why not call yarn add ...?

/var/folders/93/vjl05hsx4_vdnhvdtky_qx8m0000gn/T/tmp-30272oO0OXy5mgl56/node /var/folders/93/vjl05hsx4_vdnhvdtky_qx8m0000gn/T/tmp-30272oO0OXy5mgl56/yarn add icu4c-data@64l --no-lockfile --ignore-scripts

(Although even with that, running yarn add while an install is already in progress is completely invalid as it would likely lead to dependency tree corruptions)

[yarnbot]

We couldn’t reproduce your issue (all the assertions passed on master).