-
-
Notifications
You must be signed in to change notification settings - Fork 2.3k
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Detect TSC polyfills to avoid marking them as CJS #9318
Merged
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Benchmark ResultsKitchen Sink ✅
Timings
Cold Bundles
Cached Bundles
React HackerNews ✅
Timings
Cold Bundles
Cached Bundles
AtlasKit Editor ✅
Timings
Cold Bundles
Cached Bundles
Three.js ✅
Timings
Cold BundlesNo bundle changes detected. Cached Bundles
|
devongovett
reviewed
Oct 16, 2023
devongovett
approved these changes
Oct 17, 2023
This was referenced Oct 29, 2023
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
↪️ Pull Request
Some TSC polyfills check for prior existence of themselves via a
this._polyfill
check. Currently Parcel marks any file using a top-levelthis
as CJS. This can de-opt or even break packaged output in some cases.This PR adds a check in the JSTransformer to ensure we don't de-opt ESM modules that contain these TSC polyfills. It currently checks for the following AST pattern
this && this._polyfills
, which is a binary expression containing a this reference and a member expression withthis
and an identifier. This is a little naive but probably enough?🚨 Test instructions
✔️ PR Todo