Fix side effect detection in optional chains #5589
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
|
The latest updates on your projects. Learn more about Vercel for Git ↗︎
|
|
The latest updates on your projects. Learn more about Vercel for Git ↗︎
|
Thank you for your contribution! ❤️You can try out this pull request locally by installing Rollup via npm install rollup/rollup#gh-5579_improve-chaining-side-effect-detectionNotice: Ensure you have installed the latest stable Rust toolchain. If you haven't installed it yet, please see https://www.rust-lang.org/tools/install to learn how to download Rustup and install Rust. or load it into the REPL: |
Performance report!Rough benchmark
Internal benchmark
|
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #5589 /- ##
=======================================
Coverage 99.05% 99.05%
=======================================
Files 241 242 1
Lines 9273 9297 24
Branches 2444 2461 17
=======================================
Hits 9185 9209 24
Misses 58 58
Partials 30 30 ☔ View full report in Codecov by Sentry. |
lukastaegert
changed the title
lukastaegert
force-pushed
the
gh-5579_improve-chaining-side-effect-detection
branch
from
b78d0a8
to
58f7f32
Compare
Also, do not unnecessarily deoptimize chain expressions
|
This PR has been released as part of [email protected]. You can test it via |
This was referenced Aug 18, 2024
This was referenced Aug 31, 2024
This was referenced Sep 9, 2024
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Outdated suggestions cannot be applied.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.
This PR contains:
Are tests included?
Breaking Changes?
List any relevant issue numbers:
Description
This reworks side effect detection in optional chaining so that in case there is an optional link in a chain that skips the remainder of the chain, any side effects in the start of the chain are still observed.
To do that, I introduce two new methods in chain elements:
getLiteralValueAtPathAsChainElementis the backbone of the new logic. It behaves the same asgetLiteralValueAtPathbut has an additional Symbol return value if it is called on a skipped chain. It first calls the same method on the previous chain link and short-circuits if that call also returns that Symbol.hasEffectsAsChainElementsimilarly works likehasEffectsbut first relies ongetLiteralValueAtPathAsChainElementto detect a broken chain. That way, we can observe all side effects left of the optional link while still skipping all side effects to the right.