[Parcel 2]: Bundle group cannot have more than one entry bundle of the same type

[TobiasSchikora]

🐛 bug report

Hi together,

I am switching from Parcel 1 to Parcel 2 with a larger project. With Parcel 1 there are no problems. Parcel 2 shows the following error message: Bundle group cannot have more than one entry bundle of the same type.

My entrypoints are assets/src/*/*.js. There are 3 folders in src: mobile, desktop and shared. When I try to import the same file from assets/src/shared folder in assets/src/desktop/aaa.js as well as in assets/src/mobile/bbb.js, then the error occurs.

I saw the following code part:

(0, _assert().default)(entryBundlesOfType.length === 1, // Otherwise, we'd end up naming two bundles the same thing.
      'Bundle group cannot have more than one entry bundle of the same type');

which aborts the bundle. Why? And why does this work in parcel 1 without any problems? What can I do?

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

"scripts": {
    "start": "npx parcel watch assets/src/*/*.js --public-url ../ --no-hmr",
    "build": "npx parcel build assets/src/*/*.js --no-source-maps --public-url ../"
  }

There is no difference if I use the --dist-dir cli option or the target in package.json.

🤔 Expected Behavior

The bundle should be created without any error messages. The files which were shared between desktop and mobile entrypoints should be in both entry output files. Parcel 1 does exactly what I expected.

😯 Current Behavior

The bundle aborts with an error message as follows:

AssertionError [ERR_ASSERTION]: Bundle group cannot have more than one entry bundle of the same type
    at Object.name (C:\mf\node_modules\@parcel\namer-default\lib\DefaultNamer.js:94:29)
    at BundlerRunner.nameBundle (C:\mf\node_modules\@parcel\core\lib\requests\BundleGraphRequest.js:494:39)
    at C:\mf\node_modules\@parcel\core\lib\requests\BundleGraphRequest.js:470:50
    at Array.map (<anonymous>)
    at BundlerRunner.nameBundles (C:\mf\node_modules\@parcel\core\lib\requests\BundleGraphRequest.js:470:31)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at async BundlerRunner.bundle (C:\mf\node_modules\@parcel\core\lib\requests\BundleGraphRequest.js:434:5)
    at async RequestTracker.runRequest (C:\mf\node_modules\@parcel\core\lib\RequestTracker.js:694:20)
    at async Parcel._build (C:\mf\node_modules\@parcel\core\lib\Parcel.js:661:25). 

🔦 Context

I try to share some modules between desktop and mobile (different) entrypoints. I have much entrypoints which are sharing some modules.

💻 Code Sample

assets/src/desktop/main.js
import '../shared/components/autologin';

assets/src/mobile/main.js
import '../shared/components/autologin';

assets/src/shared/components/autologin.js
// some code

🌍 Your Environment

Software	Version(s)
Parcel	2.0.0-nightly.674
npm/Yarn	6.14.8 (npm)
Operating System	Windows 10 Pro (20H2)

[TobiasSchikora]

No, unfortunately this was not the problem :( Everytime when I inport the same file in more than one entrypoint, I got this message.

[mischnic]

Please provide a complete code example that produces this error

[TobiasSchikora]

That is, what causes the problem:

a.js

import { FuncOne } from './legacy/legacy';
import AnotherFunc from 'another.js';

b.js

import { FuncTwo } from './legacy';`

legacy.js

import AnotherFunc from 'another.js';
export FuncOne;
export FuncTwo;

CLI-Command is: npx parcel watch a.js b.js

[TobiasSchikora]

Is there a command or cli parameter to debug where exactly it crashes?

[TobiasSchikora]

Can somebody explain in which cases the message „Bundle group cannot have more than one entry bundle of the same type“ appears? Still looking for a solution :(

[TobiasSchikora]

Hi together,

I have uploaded a simplyfied version of my code which is not usable with parcel 2. My parcel cli command is: parcel watch src/*/*.js --dist-dir www/dist

The following link opens Google Drive (directory listing + download option):

https://drive.google.com/file/d/12A43L1qET1WjhY_uVGglF4yXAqzZTvfr/view?usp=sharing

I don't know if I do something wrong or this is a parcel 2 bug. In parcel 1 this example runs without any errors. Thanks for your help!

[TobiasSchikora]

It seems to be the same problem as described in #5074

[lgarron]

I tried converting a project back to Parcel and am running into this. :-/

The output is really unhelpful, so I'm at a loss.

Repro:

git clone https://github.com/cubing/cubing.js && cd cubing.js
git checkout parcel-yet-again-again # 4a71add2091da6ab46dbf493f83a16d6d4d71428
npm install
make build-search-worker
npx parcel build src/sites/experiments-cubing-net/cubing-js/index.html

Output:

🚨 Build failed.

@parcel/namer-default: Bundle group cannot have more than one entry bundle of the same type

  AssertionError [ERR_ASSERTION]: Bundle group cannot have more than one entry bundle of the same type
  at Object.name
  (/Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/namer-default/lib/DefaultNamer.js:82:29)
  at BundlerRunner.nameBundle
  (/Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:346:39)
  at
  /Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:322:50
  at Array.map (<anonymous>)
  at BundlerRunner.nameBundles
  (/Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:322:31)
  at async BundlerRunner.bundle
  (/Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:283:5)
  at async RequestTracker.runRequest
  (/Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/core/lib/RequestTracker.js:711:20)
  at async Object.run
  (/Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/core/lib/requests/ParcelBuildRequest.js:57:21)
  at async RequestTracker.runRequest
  (/Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/core/lib/RequestTracker.js:711:20)
  at async Parcel._build
  (/Users/lgarron/Code/git/github.com/cubing/cubing.js/node_modules/@parcel/core/lib/Parcel.js:397:11)

Note that this works just fine for development:

npx parcel serve src/sites/experiments-cubing-net/cubing-js/index.html

(Also, the build process (but not the dev server) also runs into issues when folders have periods, so I renamed them for this repro.)

[lgarron]

I tried converting a project back to Parcel and am running into this. :-/

The output is really unhelpful, so I'm at a loss.

This is still a major issue for us.

I just tried 2.0.0-nightly.850 and we still get the same issue.

[TobiasSchikora]

Same here. Major issue. We can't update :'(

[jlkawlfj]

My files(entry points) were in the /src/pages/ folder and I was getting the this error, but when I moved all the entry points to /src/ it worked. I waiting fix.

before: "build": "parcel build src/pages/.jsx "
after: "build": "parcel build src/.jsx "