Open JSerFeng opened 1 year ago
For me (using SWC as part of parcel) pure comments are not respected at all right now. Not sure if it's this issue or https://github.com/parcel-bundler/parcel/issues/9111?
EDIT: Some actually are but some are "eaten up" even when building with --no-optimize
and checking the output, weird. I found a good workaround though in the meantime - wrote a custom babel transformer that changes (0, FUNCTION)(...)
back to FUNCTION(...)
because my functions don't care about this
anyways and now my output bundle is 50KB smaller
Describe the bug
SWC injects pure annotation right before the async polyfill call, however if async arrow function is been assigned, the PURE annotation appear in the wrong position.
Why does this matter
Because if Pure appears before the import statements, when this code is processed by webpack, if this module's dependencies are all concatenated, then the import statements are gone, and the code will be like this
As you can see the PURE annotation points that setSomeEffect call is pure which is not, and removes this call expression after minimization.
Input code
Config
Playground link
https://play.swc.rs/?version=1.3.71&code=H4sIAAAAAAAAAytOLQnOz011TUtLTS7R0OTi0tdXMDQy5krOzysuUUhUsFVILK7MS1bQ0FSwtVOo5qq15uJKK81LLsnMz1MoykzPKAnISUxOBUpXcykAAVQ7iImqESQC1FwLAKBlQRFxAAAA&config=H4sIAAAAAAAAA12NwQqDQAxE737FkrNXL95KL%2F2NRQaxrNslGUUR%2F72xUqG9JW8mL1sVgjytkzZsPvqChdAc0wOpQM0D6oT6DEtUg15lJ7Tlp%2BLI1sx4UOFaYJ0OhXKm%2B9ejcM%2BMW0r31zgi8%2B8Ro%2Fbg4YA1Un0u9zcWcwxJrQAAAA%3D%3D
Expected behavior
Pure annotation should appear inside the assignment expr, like the one inside rightPlace function body
Actual behavior
Pure annotation appears at the top of the module
Version
1.3.71
Additional context
No response