Expand the tuple contextual type to the target's shape when it comes from a binding pattern#52630
Closed
Andarist wants to merge 2 commits intomicrosoft:mainfrom
Closed
Expand the tuple contextual type to the target's shape when it comes from a binding pattern#52630Andarist wants to merge 2 commits intomicrosoft:mainfrom
Andarist wants to merge 2 commits intomicrosoft:mainfrom
Conversation
Andarist
commented
Feb 6, 2023
| // this allows us to infer tuples even if the binding pattern is shorter than the target type, like here: | ||
| // declare function fn<T>(t: T) => [T, string[]]; | ||
| // const [[x]] = fn(['hi']); | ||
| else if (isTupleType(contextualType) && isTupleType(inferenceTargetType)) { |
Contributor
Author
There was a problem hiding this comment.
this doesn't handle the case when inferenceTargetType is a union of tuple types but I have no idea how "expansion" towards that shape should work - unless all union members would have the very same shape
…from a binding pattern
Member
|
This seems pretty reasonable to me. @typescript-bot user test this |
Collaborator
|
Heya @andrewbranch, I've started to run the diff-based top-repos suite on this PR at cfc350b. You can monitor the build here. Update: The results are in! |
Collaborator
|
Heya @andrewbranch, I've started to run the diff-based user code test suite on this PR at cfc350b. You can monitor the build here. Update: The results are in! |
Collaborator
|
Heya @andrewbranch, I've started to run the perf test suite on this PR at cfc350b. You can monitor the build here. Update: The results are in! |
Collaborator
|
@andrewbranch Here are the results of running the user test suite comparing Everything looks good! |
Collaborator
|
@andrewbranch Here are the results of running the top-repos suite comparing Everything looks good! |
Collaborator
|
@andrewbranch Here they are:
CompilerComparison Report - main..52630
System
Hosts
Scenarios
TSServerComparison Report - main..52630
System
Hosts
Scenarios
StartupComparison Report - main..52630
System
Hosts
Scenarios
Developer Information: |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
# Conflicts: # tests/baselines/reference/inferTupleFromBindingPattern.js # tests/baselines/reference/inferTupleFromBindingPattern.symbols # tests/baselines/reference/inferTupleFromBindingPattern.types
weswigham
reviewed
Jun 13, 2023
| resultFlags = source.target.elementFlags.slice(); | ||
| } | ||
| const targetFlag = target.target.elementFlags[i]; | ||
| resultTypes.push(anyType); |
Member
There was a problem hiding this comment.
Rather than any with the target flags, shouldn't it be never with the optional flag? To reflect how the consumer never reads the member?
Contributor
Author
|
This gets superseded by #56875 since this PR here aimed to solve the problem through special-casing and the new PR takes a much more general approach to this and similar problems. |
This file contains hidden or 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
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
4 participants
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.
fixes #42969
cc @andrewbranch