postinstall hook doesn't appear to be run

[wavded]

Do you want to request a feature or report a bug?

Not sure if its a feature or a bug, but I was expecting my postinstall hook to run after yarn was executed and it did not.

What is the current behavior?

yarn installs dependencies but does not run postinstall hook in the package.json file.

If the current behavior is a bug, please provide the steps to reproduce.

Sample package.json:

{
  "name": "hi",
  "version": "1.0.0",
  "scripts": {
    "postinstall": "echo hi"
  },
  "dependencies": {
    "lodash": "*"
  },
  "main": "index.js",
  "license": "MIT"
}

Run yarn. Do not see hi echoed.

What is the expected behavior?

Node 6.7.0 and Yarn 0.15.1 and macOS 10.12

Please mention your node.js, yarn and operating system version.

[wavded]

I noticed this comment from TC that may shed some light?

By default, npm also allows developers who write these packages to execute other code that’s needed as part of the install process. That creates security issues, though, so Yarn does not have this feature.

-- Source

Perhaps postinstall was removed intentionally? It is handy when someone is setting up a project on their machine to have any additional setup stuff done at that point.

[Restuta]

It's handy in few other cases as well, e.g. on heroku it's a recommended way to customize build process https://devcenter.heroku.com/articles/nodejs-support#customizing-the-build-process

[rjmunro]

This is strange, because in my experience, I found that the postinstall script was run for a package I was installing, but it didn't work for some reason, which I have documented in #614.

[shiftkey]

@rjmunro I also see the postinstall hooks working fine for installed packages, but any postinstall command defined in my project.json are ignored.

[rjmunro]

@shiftkey That sounds exactly backwards if the intention is to prevent third party code running on install unnecessarily.

[glebmachine]

Looks the same issue here: #614

[sebmck]

Fixed via #800.

[henev]

Still reproducible with Angular 2 Quickstart tutorial as described here: #818

[karneaud]

Does post install work or not?

[vith]

@karneaud Looks like it's working but terminal output is hidden. Currently open issue is here: #5476