CSS module composes triggers Got unexpected null in ScopeHoistingPackager

[mischnic]

🐛 bug report

CSS module with composes triggers Got unexpected null

🤔 Expected Behavior

Works

😯 Current Behavior

  Error: Got unexpected null
      at nullthrows (parcel/node_modules/nullthrows/nullthrows.js:7:15)
      at every (parcel/packages/packagers/js/src/ScopeHoistingPackager.js:1081:35)
      at Array.every (<anonymous>)
      at filter (parcel/packages/packagers/js/src/ScopeHoistingPackager.js:1080:35)
      at Array.filter (<anonymous>)
      at ScopeHoistingPackager.buildAssetPrelude (parcel/packages/packagers/js/src/ScopeHoistingPackager.js:1069:60)
      at ScopeHoistingPackager.buildAsset (parcel/packages/packagers/js/src/ScopeHoistingPackager.js:448:48)
      at ScopeHoistingPackager.visitAsset (parcel/packages/packagers/js/src/ScopeHoistingPackager.js:383:17)
      at processAsset (parcel/packages/packagers/js/src/ScopeHoistingPackager.js:143:40)
      at visit (parcel/packages/packagers/js/src/ScopeHoistingPackager.js:170:7)
      at visit (parcel/packages/core/graph/src/Graph.js:504:16)
      at visit (parcel/packages/core/graph/src/Graph.js:504:16)
      at enter (parcel/packages/core/graph/src/Graph.js:504:16)
      at walk (parcel/packages/core/graph/src/Graph.js:346:26)
      at walk (parcel/packages/core/graph/src/Graph.js:367:22)
      at ContentGraph.dfs (parcel/packages/core/graph/src/Graph.js:395:12)
      at BundleGraph.traverseBundle (parcel/packages/core/core/src/BundleGraph.js:1321:24)
      at BundleGraph.traverseAssets (parcel/packages/core/core/src/BundleGraph.js:1117:17)
      at NamedBundle.traverseAssets (parcel/packages/core/core/src/public/Bundle.js:193:30)
      at ScopeHoistingPackager.package (parcel/packages/packagers/js/src/ScopeHoistingPackager.js:164:17)
      at processTicksAndRejections (node:internal/process/task_queues:95:5)
      at Object.package (parcel/packages/packagers/js/src/index.js:62:26)

💁 Possible Solution

Something about the JS generated for the CSS module has to trigger this?

🔦 Context

#9058

💻 Code Sample

src.zip

🌍 Your Environment

Software	Version(s)
Parcel	0645f64

[AndrewKvalheim]

A reproduction trimmed down from my codebase:

$ echo 'export const c = "c"; export default "a";' > a.js
$ echo 'import { c } from "./a"; console.log(c);' > b.js
$ echo '<script type=module src='{a,b}'.js></script>' > index.html
$ yarn add parcel@2.8.3 && parcel build index.html
✨ Built in 722ms
$ yarn add parcel@2.9.2 && parcel build index.html
🚨 Build failed.

@parcel/packager-js: Got unexpected null

  Error: Got unexpected null
      at nullthrows (node_modules/nullthrows/nullthrows.js:7:15)
      at node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:813:51
      at Array.every (<anonymous>)
      at node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:812:35
      at Array.filter (<anonymous>)
      at ScopeHoistingPackager.buildAssetPrelude
  (node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:802:60)
      at ScopeHoistingPackager.buildAsset
  (node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:367:48)
      at ScopeHoistingPackager.visitAsset
  (node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:322:17)
      at processAsset (node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:126:40)
      at ScopeHoistingPackager.package
  (node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:140:9)

[colorgold]

I was having this same issue, but I solved it by running parcel build public/index.html --no-scope-hoist.
Adding the --no-scope-hoist is what did it for me. I don't know exactly what was preventing Parcel from "scope hoisting", so in the meantime I will go without it.

[DimaPFf]

Thank you! It works for me too!

[ajyoon]

I'm running into this issue as well, coming from the same line in ScopeHoistingPackager.

[shepmaster]

Continues to happen in 2.12

🚨 Build failed.

@parcel/packager-js: Got unexpected null

  Error: Got unexpected null
      at nullthrows
  (<project>/node_modules/.pnpm/nullthrows@1.1.1/node_modules/nullthrows/nullthrows.js:7:15)
      at
  <project>/node_modules/.pnpm/@parcel+packager-js@2.12.0_@parcel+core@2.12.0/node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:864:51
      at Array.every (<anonymous>)
      at
  <project>/node_modules/.pnpm/@parcel+packager-js@2.12.0_@parcel+core@2.12.0/node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:863:35
      at Array.filter (<anonymous>)
      at ScopeHoistingPackager.buildAssetPrelude
  (<project>/node_modules/.pnpm/@parcel+packager-js@2.12.0_@parcel+core@2.12.0/node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:853:60)
      at ScopeHoistingPackager.buildAsset
  (<project>/node_modules/.pnpm/@parcel+packager-js@2.12.0_@parcel+core@2.12.0/node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:404:48)
      at ScopeHoistingPackager.visitAsset
  (<project>/node_modules/.pnpm/@parcel+packager-js@2.12.0_@parcel+core@2.12.0/node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:359:17)
      at processAsset
  (<project>/node_modules/.pnpm/@parcel+packager-js@2.12.0_@parcel+core@2.12.0/node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:142:40)
      at
  <project>/node_modules/.pnpm/@parcel+packager-js@2.12.0_@parcel+core@2.12.0/node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:167:7