@parcel/bundler-default: The expression evaluated to a falsy value (CSS modules and non-modules) #8716

nartallax · 2022-12-26T08:39:44Z

🐛 bug report

In particular circumstances I get following error when building my project:

@parcel/bundler-default: The expression evaluated to a falsy value:

  (0, _assert().default)(bundle !== 'root' && bundle != null)

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

Minimal example is here

Key points: if there is non-module CSS file and more than one module CSS files in project - build will fail.

Build command is

./node_modules/.bin/parcel build src/index.html --no-cache

🤔 Expected Behavior

Build should not fail. I don't think this CSS structure is wrong or unobvious; at least it should lead to better error than just "assertion failed"

😯 Current Behavior

Build fails with following stack trace:

@parcel/bundler-default: The expression evaluated to a falsy value:

  (0, _assert().default)(bundle !== 'root' && bundle != null)


  AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

    (0, _assert().default)(bundle !== 'root' && bundle != null)

      at getBundleFromBundleRoot (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/bundler-default/lib/DefaultBundler.js:1018:27)
      at createIdealGraph (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/bundler-default/lib/DefaultBundler.js:692:21)
      at Object.bundle (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/bundler-default/lib/DefaultBundler.js:122:19)
      at BundlerRunner.bundle (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:288:23)
      at async Object.run (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:156:17)
      at async RequestTracker.runRequest (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/core/lib/RequestTracker.js:756:20)
      at async Object.run (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/core/lib/requests/ParcelBuildRequest.js:56:7)
      at async RequestTracker.runRequest (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/core/lib/RequestTracker.js:756:20)
      at async Parcel._build (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/core/lib/Parcel.js:400:11)
      at async Parcel.run (/Users/MY_USERNAME/parcel_css_bug/node_modules/@parcel/core/lib/Parcel.js:276:18)

🔦 Context

I'm just developing some websites lol

💻 Code Sample

Minimal example is here

🌍 Your Environment

Software	Version(s)
Parcel	2.8.2
Node	v16.16.0
npm/Yarn	8.11.0
Operating System	macOS 13.0.1

mischnic · 2022-12-26T10:27:17Z

cc @AGawrys

oe · 2022-12-27T05:50:31Z

same here with parcel@2.8.2

JulianGibelli · 2023-01-05T22:00:25Z

Same here! parcel version 2.8.2

littleLane · 2023-01-14T04:08:40Z

+1

devongovett · 2023-01-18T16:25:20Z

Should be fixed by #8762

shepmaster · 2023-01-25T18:25:23Z

I see that this is closed and should have been fixed by 2.8.3. However, after upgrading from 2.8.0 to 2.8.3, I still see the same error:

🚨 Build failed.

@parcel/bundler-default: The expression evaluated to a falsy value:

  (0, _assert().default)(bundle !== 'root' && bundle != null)


  AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

    (0, _assert().default)(bundle !== 'root' && bundle != null)

      at getBundleFromBundleRoot (...project.../node_modules/@parcel/bundler-default/lib/DefaultBundler.js:1033:27)
      at createIdealGraph (...project.../node_modules/@parcel/bundler-default/lib/DefaultBundler.js:698:21)
      at Object.bundle (...project.../node_modules/@parcel/bundler-default/lib/DefaultBundler.js:122:19)
      at BundlerRunner.bundle (...project.../node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:288:23)
      at async Object.run (...project.../node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:156:17)
      at async RequestTracker.runRequest (...project.../node_modules/@parcel/core/lib/RequestTracker.js:756:20)
      at async Object.run (...project.../node_modules/@parcel/core/lib/requests/ParcelBuildRequest.js:56:7)
      at async RequestTracker.runRequest (...project.../node_modules/@parcel/core/lib/RequestTracker.js:756:20)
      at async Parcel._build (...project.../node_modules/@parcel/core/lib/Parcel.js:400:11)
at async Parcel._startNextBuild (...project.../node_modules/@parcel/core/lib/Parcel.js:298:24)

What should I look for in my project to see what might be unique from the cases that were already fixed?

AGawrys · 2023-01-25T18:40:57Z

Might just be the same symptom. Do you have a repro or repo I could look at? @shepmaster

shepmaster · 2023-01-25T19:54:52Z

Here is a minimized example: repro.zip. Unzip it, run yarn && yarn build to see the error. I'm using Node v19.4.0 on macOS.

My gut tells me that it has to do with using the extends feature of CSS modules, but I've got nothing concrete to back that up. Thanks!

itaylor · 2023-03-07T06:40:25Z

I also have this problem, it's definitely caused by css modules composes, which my project makes extensive use of.

It looks like the file referenced in the compose statement is added as an asset dependency, but then doing that messes up the bundleRootGraph somehow in createIdealGraph in DefaultBundler (perhaps only if the composed file is also a css module?).

Using @shepmaster's repro from above and then removing the statement:

             asset.addDependency({
                specifier: ref.specifier,
                specifierType: 'esm',
              });

From the CSSTransformer's handling of composes solves the error in the build, and it still retains the composed css.

It looks like this was added fairly recently to improve css import ordering:
ddae31a#diff-4a76ab5816b5309c818b936e2b32e9beeca804ecf94c2bd18cc22108e02b5274

devongovett · 2023-03-26T15:44:38Z

Should be fixed by #8885

martindavid · 2023-04-17T10:55:21Z

@devongovett how to get the fixed version for this? Should there be a patch version release for this?

chrissound · 2023-05-16T17:44:23Z

I got this error when running parcel with additional html files (with 0 css links/references) in a article/ directory.

Basically parcel webroot/index.html works, while parcel webroot/index.html webroot/article/*.html resulted in this error...

mischnic · 2023-05-16T18:19:43Z

There will be a release including the fix very soon

geremsadaimary · 2024-02-21T07:31:03Z

why is this closed without being fixed

anupxroutray · 2024-02-21T07:31:30Z

+1 @geremsadaimary @mischnic

sohamshet26 · 2024-09-05T07:08:10Z

I see that this is closed and should have been fixed by 2.8.3. However, after upgrading from 2.8.0 to 2.8.3, I still see the same error:

🚨 Build failed.

@parcel/bundler-default: The expression evaluated to a falsy value:

  (0, _assert().default)(bundle !== 'root' && bundle != null)


  AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

    (0, _assert().default)(bundle !== 'root' && bundle != null)

      at getBundleFromBundleRoot (...project.../node_modules/@parcel/bundler-default/lib/DefaultBundler.js:1033:27)
      at createIdealGraph (...project.../node_modules/@parcel/bundler-default/lib/DefaultBundler.js:698:21)
      at Object.bundle (...project.../node_modules/@parcel/bundler-default/lib/DefaultBundler.js:122:19)
      at BundlerRunner.bundle (...project.../node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:288:23)
      at async Object.run (...project.../node_modules/@parcel/core/lib/requests/BundleGraphRequest.js:156:17)
      at async RequestTracker.runRequest (...project.../node_modules/@parcel/core/lib/RequestTracker.js:756:20)
      at async Object.run (...project.../node_modules/@parcel/core/lib/requests/ParcelBuildRequest.js:56:7)
      at async RequestTracker.runRequest (...project.../node_modules/@parcel/core/lib/RequestTracker.js:756:20)
      at async Parcel._build (...project.../node_modules/@parcel/core/lib/Parcel.js:400:11)
at async Parcel._startNextBuild (...project.../node_modules/@parcel/core/lib/Parcel.js:298:24)

What should I look for in my project to see what might be unique from the cases that were already fixed?

i have also got this type of error but i just cleared my parcel cashe and the error was resolved

mischnic added 🐛 Bug Bundler labels Dec 26, 2022

AGawrys self-assigned this Jan 5, 2023

devongovett mentioned this issue Jan 6, 2023

Edge from X to Y not found! when using inline Sass and multiple targets #8754

Closed

AGawrys mentioned this issue Jan 10, 2023

Address bug by updating an asset reference and merge conditions #8762

Merged

3 tasks

devongovett closed this as completed Jan 18, 2023

mischnic reopened this Feb 6, 2023

AGawrys mentioned this issue Mar 14, 2023

Fix css-module related build error in bundling #8885

Merged

3 tasks

devongovett closed this as completed Mar 26, 2023

remarkablemark mentioned this issue Jan 3, 2024

build(deps-dev): bump parcel from 2.8.3 to 2.10.3 remarkablemark/react-typescript-parcel-template#193

Merged

NicolasCARPi mentioned this issue Apr 12, 2024

Build a dist NicolasCARPi/dropzone#2

Closed

Poky85 mentioned this issue May 15, 2024

@parcel/core: Error: The expression evaluated to a falsy value #9717

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@parcel/bundler-default: The expression evaluated to a falsy value (CSS modules and non-modules) #8716

@parcel/bundler-default: The expression evaluated to a falsy value (CSS modules and non-modules) #8716

nartallax commented Dec 26, 2022

mischnic commented Dec 26, 2022

oe commented Dec 27, 2022

JulianGibelli commented Jan 5, 2023

littleLane commented Jan 14, 2023

devongovett commented Jan 18, 2023

shepmaster commented Jan 25, 2023 •

edited

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AGawrys commented Jan 25, 2023

shepmaster commented Jan 25, 2023 •

edited

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itaylor commented Mar 7, 2023

devongovett commented Mar 26, 2023

martindavid commented Apr 17, 2023

chrissound commented May 16, 2023

mischnic commented May 16, 2023

geremsadaimary commented Feb 21, 2024

anupxroutray commented Feb 21, 2024 •

edited

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sohamshet26 commented Sep 5, 2024

@parcel/bundler-default: The expression evaluated to a falsy value (CSS modules and non-modules) #8716

@parcel/bundler-default: The expression evaluated to a falsy value (CSS modules and non-modules) #8716

Comments

nartallax commented Dec 26, 2022

🐛 bug report

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

🤔 Expected Behavior

😯 Current Behavior

🔦 Context

💻 Code Sample

🌍 Your Environment

mischnic commented Dec 26, 2022

oe commented Dec 27, 2022

JulianGibelli commented Jan 5, 2023

littleLane commented Jan 14, 2023

devongovett commented Jan 18, 2023

shepmaster commented Jan 25, 2023 • edited Loading

AGawrys commented Jan 25, 2023

shepmaster commented Jan 25, 2023 • edited Loading

itaylor commented Mar 7, 2023

devongovett commented Mar 26, 2023

martindavid commented Apr 17, 2023

chrissound commented May 16, 2023

mischnic commented May 16, 2023

geremsadaimary commented Feb 21, 2024

anupxroutray commented Feb 21, 2024 • edited Loading

sohamshet26 commented Sep 5, 2024

shepmaster commented Jan 25, 2023 •

edited

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shepmaster commented Jan 25, 2023 •

edited

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anupxroutray commented Feb 21, 2024 •

edited

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