Parcel 2: Bundles must have unique filePaths when using duplicate content in files

🐛 bug report

When including two files with the same content and name but in different folders, the build fails with Bundles must have unique filePaths.

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

None, see example here: https://github.com/garthenweb/parcel2-unique-filePaths-example

🤔 Expected Behavior

In a perfect world parcel should detect that both assets are equal and could just include one in the bundle. But I can imagine that this might have side effects. I would be fine if the build would not fail. A warning would be nice as well as I was not aware that I have duplicate files in my bundle before running parcel 2.

😯 Current Behavior

Errors with

🚨 Bundles must have unique filePaths
    at BundlerRunner.nameBundles (<path>/node_modules/@parcel/core/lib/BundlerRunner.js:121:21)
    at async BundlerRunner.bundle (<path>/node_modules/@parcel/core/lib/BundlerRunner.js:92:5)
    at async Parcel.build (<path>/node_modules/@parcel/core/lib/Parcel.js:289:25)
    at async Parcel.run (<path>/node_modules/@parcel/core/lib/Parcel.js:196:18)
    at async Command.run (<path>/node_modules/parcel/lib/cli.js:132:7)

💁 Possible Solution

Including the file path into the hash generation would maybe help.

🔦 Context

I was running parcel 2 on a bigger code base and had round about 10 files of type scss, svg and js in the bundle that caused this error. I detected the files by adding the following into the BundleRunner.js file which throw the error:

console.log(bundlePaths.filter((val, index,list) => {
  return list.indexOf(val) !== index;
}))

While creating the example project I found out that css files worked perfectly fine but for scss files it was failing.

💻 Code Sample

See example here: https://github.com/garthenweb/parcel2-unique-filePaths-example

🌍 Your Environment

Software	Version(s)
Parcel	2.0.0-alpha.1.1
Node	v12.8.1
npm	6.10.2
Operating System	Max OSX

[sw-yx]

leaving this for anyone running into this issue: if you have a “main” field in package.json that says “index.html” and also run parcel build index.html you get this error.

just remove the “main” field and ur good.

–

edit from the future: hi ali 😃

[Berkmann18]

@swashcap Same here, on a project with no duplicate source files.