`--yarn` can not work correctly after 1.81.0

[YXL76]

If project has yarn.lock file, vsce will use yarn automatically. However, when using --yarn flag, it will fall back to npm

[roydukkey]

I don't use yarn and I received the following error:

% vsce package            
Executing prepublish script 'yarn run vscode:prepublish'...
/bin/sh: yarn: command not found
 ERROR  yarn failed with exit code 127

These are the only packages I have globally:

% npm -g list --depth 0
/usr/local/lib
├── n@6.7.0
├── npm@6.14.8
└── vsce@1.81.0

[marklawlor]

In addition to @roydukkey comments. A fresh project with no .yarnrc, yarn.lock or yarn executable installed is defaulting to yarn.

[ranavale]

• Azure build pipeline was working fine with vscode build plugin step (using Executing prepublish script 'npm run vscode:prepublish'...)
• I have not installed yarn neither my repo has anything related to yarn.
• Since today afternoon, prepublish is using Executing prepublish script 'yarn run vscode:prepublish'... and failing with

'yarn' is not recognized as an internal or external command,
operable program or batch file.
 ERROR  yarn failed with exit code 1

[felipecrs]

Does --no-yarn helps?

[ranavale]

@felipecrs It did not, as I am using azure build pipeline. rather I am not sure what changes/task I need to change in azure pipeline. My extension scripts are

    "scripts": {
        "vscode:prepublish": "npm run compile",
        "compile": "tsc -p ./",
        "watch": "tsc -watch -p ./",
        "test": "npm run compile && node ./node_modules/vscode/bin/test"
    },

[felipecrs]

I can confirm the bug, I tried to debug but I was not able to.

For users facing this issue, I recommend to downgrade vsce:

{
  "devDependencies": {
    "vsce": "1.80.0"
  }
}

[felipecrs]

Okay, I found the issue.

The commander always sets the yarn option to true by default, rather than undefined.

/cc @rbuckton @joaomoreno

[felipecrs]

Submitted a PR. This behavior was fixed in commander 3.0.0.

[ranavale]

adding --no-yarn fixed the issue, but I think every user need to update their pipeline for this is not a good recommendation.

[felipecrs]

adding --no-yarn fixed the issue, but I think every user need to update their pipeline for this is not a good recommendation.

For sure, it's not a solution, just a workaround until the issue gets fixed.

However, I believe the best workaround so far is to downgrade the vsce to 1.80.0.

[joaomoreno]

Oof, sorry about that. Releasing a new version asap.