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fix: don't explode when dynamic imports are removed by tree-shaking #538

merged 3 commits into from Jan 16, 2019


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commented Jan 16, 2019


Working around rollup/rollup#2659

Motivation and Context

Without this change if you have any dynamic imports in your codebase that can be dropped by treeshaking you'll get JS errors like the following:

[!] (@modular-css/rollup plugin) TypeError: Cannot destructure property `modules` of 'undefined' or 'null'.
TypeError: Cannot destructure property `modules` of 'undefined' or 'null'.
    at usage.overallOrder.forEach (node_modules\@modular-css\rollup\rollup.js:199:68)
    at Array.forEach (<anonymous>)
    at Object.generateBundle (node_modules\@modular-css\rollup\rollup.js:196:34)
    at \node_modules\rollup\dist\rollup.js:16609:25

How Has This Been Tested?

Added specimens and a test to the rollup code-splitting tests to ensure it no longer throws an error.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)


  • My code follows the code style of this project.
  • My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • I have read the CONTRIBUTING document.
  • I have added tests to cover my changes.
  • All new and existing tests passed.

@tivac tivac self-assigned this Jan 16, 2019

@tivac tivac merged commit c2a09e1 into master Jan 16, 2019

3 of 4 checks passed

continuous-integration/travis-ci/pr The Travis CI build is in progress
codecov/patch Coverage not affected.
codecov/project No report found to compare against
continuous-integration/travis-ci/push The Travis CI build passed

@tivac tivac deleted the dynamic-imports-tree-shaking branch Jan 16, 2019


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commented Jan 16, 2019

Hey @tivac,
Something went wrong with the build.

TravisCI finished with status errored, which means the build failed because of something unrelated to the tests, such as a problem with a dependency or the build process itself.

View build log

TravisBuddy Request Identifier: 4cd9fc30-19da-11e9-b6ef-27c2ed554f09
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