[Bug] running just yarn doesn't install

[Haroenv]

• I'd be willing to implement a fix

Describe the bug

Running yarn in v2 gives this error:

yarn
Usage Error: Couldn't find a script named "".

$ yarn run <scriptName> ...

Since we can't run a script named empty string, the previous default of installing makes more sense

To Reproduce

Running just yarn gives this error, regardless of environment.

await packageJsonAndInstall({});
await expect(yarn()).resolves.toBeTruthy();

Environment if relevant (please complete the following information):

• Yarn version: 2.0.0-rc.26

Additional context

in v1 this installed

[arcanis]

That's weird, I can't reproduce it 🤔

[Haroenv]

I can still reproduce this in the berry repository, what more info could help you?

[arcanis]

Do you have an alias on yarn, by any chance? Maybe try to add a console.log(process.argv) in yarnpkg-cli/sources/boot-cli-dev.js to see what it truly contains 🤔

[Haroenv]

Hmm, that is a good call:

process.argv === [
  '/Users/haroen/.nvm/versions/node/v13.3.0/bin/node',
  '/Users/haroen/git/berry/scripts/run-yarn.js',
  ''
]

[arcanis]

Interesting - any idea where that might come from? Is it nvm? 🤔

[Haroenv]

Yes, I am using nvm on fish, let me see how it's configured

[yarnbot]

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

[arcanis]

(sorry for the spammy yarnbot - it triggers when the tags change, even if it changes them itself 🤦‍♀️)

[Haroenv]

Looks like this one is the one I'm using https://github.com/FabioAntunes/fish-nvm

[Haroenv]

(installed with https://github.com/jorgebucaran/fisher)

[arcanis]

Have you found the cause? Should we close the issue?

[Haroenv]

I have not found the issue for this, but I guess it can be closed for now

[jrr]

This is happening to me, too, using Yarn 2.4.0 with Fish:

jrr@jrrmbp ~/dir (experiment/yarn-2)> node --version
v14.15.3
jrr@jrrmbp ~/dir (experiment/yarn-2)> which node
/Users/jrr/.nvm/versions/node/v14.15.3/bin/node
jrr@jrrmbp ~/dir (experiment/yarn-2)> yarn --version
2.4.0
jrr@jrrmbp ~/dir (experiment/yarn-2)> which yarn
/usr/local/bin/yarn
jrr@jrrmbp ~/dir (experiment/yarn-2)> yarn
Usage Error: Couldn't find a script named "".

$ yarn run [--inspect] [--inspect-brk] <scriptName> ...
jrr@jrrmbp ~/dir (experiment/yarn-2) [1]>

@arcanis can you reopen? I'd be willing to try to fix it, if you can help me figure out where to look next.

[ghost]

Same here, on yarn 2.4.1:

bash-3.2$ yarn check-eslint
[
  '/usr/local/bin/node',
  '/project/node_modules/eslint/bin/eslint.js',
  ''
]

on yarn 1.22.10:

bash-3.2$ yarn check-eslint
[
  '/usr/local/bin/node',
  '/project/node_modules/.bin/eslint'
]

[merceyz]

Can reproduce by running yarn "" (which translates to yarn<space>)

[jrr]

I think this may be fixed in fish 3.2.1: https://github.com/fish-shell/fish-shell/releases/tag/3.2.1

(I can no longer repro it)

Can someone else try?