check return type of this type predicates #57341
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@typescript-bot test top200 @typescript-bot perf test this faster |
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Heya @jakebailey, I've started to run the tarball bundle task on this PR at 89a7208. You can monitor the build here. |
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Heya @jakebailey, I've started to run the parallelized Definitely Typed test suite on this PR at 89a7208. You can monitor the build here. Update: The results are in! |
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Heya @jakebailey, I've started to run the diff-based user code test suite on this PR at 89a7208. You can monitor the build here. Update: The results are in! |
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Heya @jakebailey, I've started to run the diff-based top-repos suite on this PR at 89a7208. You can monitor the build here. Update: The results are in! |
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Heya @jakebailey, I've started to run the faster perf test suite on this PR at 89a7208. You can monitor the build here. Update: The results are in! |
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Hey @jakebailey, I've packed this into an installable tgz. You can install it for testing by referencing it in your and then running There is also a playground for this build and an npm module you can use via |
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@jakebailey Here are the results of running the user test suite comparing There were infrastructure failures potentially unrelated to your change:
Otherwise... Something interesting changed - please have a look. Details
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@jakebailey Here they are:
tscComparison Report - baseline..pr
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Hey @jakebailey, the results of running the DT tests are ready. |
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@jakebailey Here are the results of running the top-repos suite comparing Everything looks good! |
gabritto
requested changes
Apr 5, 2024
src/compiler/checker.ts
Outdated
| @@ -20888,6 +20889,9 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker { | |||
| } | |||
| return Ternary.False; | |||
| } | |||
| else if (isThisTypePredicate(targetTypePredicate)) { | |||
| result &= compareTypes(sourceReturnType, targetReturnType, reportErrors); | |||
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That doesn't look right. We don't consider a function with a boolean return type assignable to a function with an identifier type predicate, as the code above implies. So I think instead of adding this change, what we want to do is change the condition above to also account for this type predicates: they should behave the same as identifier type predicates.
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Updated. However, it could potentially break some seemingly innocent code.
interface LineCollection {
isLeaft(): this is LineLeaf;
}
class LineNode implements LineCollection {
isLeaf() {
return false;
}
}| !!! error TS2416: Type '() => void' is not assignable to type '() => boolean'. | ||
| !!! error TS2416: Type 'void' is not assignable to type 'boolean'. | ||
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| method3() { // should ok |
gabritto
approved these changes
Apr 8, 2024
| @@ -591,7 +591,7 @@ export class LineNode implements LineCollection { | |||
| if (children.length) this.updateCounts(); | |||
| } | |||
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| isLeaf() { | |||
| isLeaf(): this is LineLeaf { | |||
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@typescript-bot test it |
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Hey @gabritto, the results of running the DT tests are ready. There were interesting changes: Branch only errors:Package: vinyl-file Package: vinyl Package: winjs |
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@gabritto Here they are:
tscComparison Report - baseline..pr
System info unknown
Hosts
Scenarios
Developer Information: |
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@gabritto Here are the results of running the user tests comparing Everything looks good! |
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I'm guessing this PR breaks |
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@gabritto Here are the results of running the top 400 repos comparing Something interesting changed - please have a look. Details
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This was referenced Apr 10, 2024
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Fixes #57103