fix attempt: enable export mangling for modules used only as export objects#19219
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scameron wants to merge 3 commits into
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fix attempt: enable export mangling for modules used only as export objects#19219scameron wants to merge 3 commits into
scameron wants to merge 3 commits into
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lib/ExportsInfo.js:402
- The new method
setUsedAsExportObjectshould be covered by tests to ensure it behaves as expected.
setUsedAsExportObject(runtime) {
lib/FlagDependencyUsagePlugin.js:93
- The new behavior introduced by setUsedAsExportObject should be covered by tests to ensure correctness and prevent regressions.
if (exportsInfo.setUsedAsExportObject(runtime)) {
lib/optimize/MangleExportsPlugin.js:25
- The removal of this check might change the intended behavior of the canMangle function. Please ensure this change is intentional and doesn't introduce any bugs.
if (exportsInfo.otherExportsInfo.getUsed(undefined) !== UsageState.Unused)
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Can you add tests cases?
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Looks like a problem with |
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@scameron from failing test cases i can think there is some error in the code style in which you have written try to fix that and re run the yarn test --basic to see further outputs |
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This is a first attempt at a fix for issue #19153. I'm almost certain that this is wrong, but it seems to work in my case. The hope is that running this through the automated tests will show more info about specifically what is wrong with this.
I tried this in my full production build and it succeeds there as well. The chunk size is reduced by nearly 3MB overall after this change (in an enormous 484MB build, but still).
What kind of change does this PR introduce?
In cases where a depency has no specific used exports, but instead is used as an "export object" via an export of
import *, we no longer mark the usage as "unknown" but instead mark it as used.Did you add tests for your changes?
No new tests. This is an experiment to see what existing tests break.
Does this PR introduce a breaking change?
Not sure yet...
What needs to be documented once your changes are merged?
No documentation