Parcel tries to install package on missing local plugin

[wenkokke]

🐛 bug report

When .parcelrc references a non-existant local plugin, Parcel attempts to install a package, then fails with a confusing error message.

🎛 Configuration (.parcelrc, package.json, cli command)

// .parcelrc
{
  "extends": "@parcel/config-default",
  "transformers": {
    "*.md": [
      "./scripts/parcel-transformer-md.mjs",
      "..."
    ]
  }
}

// package.json
{
  "private": true,
  "name": "parcel-bug",
  "scripts": {
    "dev": "parcel index.md"
  },
  "devDependencies": {
    "parcel": "^2.9.3",
  }
}

# cli command
npm run dev

🤔 Expected Behavior

Parcel should fail with an error message that says that the file "./scripts/parcel-transformer-md.mjs" doesn't exist.

😯 Current Behavior

Parcel attempts to install the "scripts" package, presumable extracted from the plugin path, then fails:

$ npm run dev

> dev
> parcel index.md

Server running at http://localhost:1234

Installing scripts...
🚨 Build failed.

@parcel/package-manager: Could not find module "scripts", but it was listed in package.json.
 Run your package manager first.

  /Users/keri/Projects/parcel-bug/package.json:9:5
     8 |     "parcel": "^2.9.3",
  >  9 |     "scripts": "^0.1.0"
  >    |     ^^^^^^^^^ Defined here, but not installed
    10 |   }
    11 | }

💻 Code Sample

# extract contents and run the following commands to reproduce
npm i
npm run dev

parcel-bug.zip

🌍 Your Environment

Software	Version(s)
Parcel	parcel 2.9.3
Node	node 20.5.1
npm/Yarn	npm 9.8.0
Operating System	macOS 13.5.2