Infer from context sensitive return expressions#60909
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Andarist wants to merge 11 commits intomicrosoft:mainfrom
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Infer from context sensitive return expressions#60909Andarist wants to merge 11 commits intomicrosoft:mainfrom
Andarist wants to merge 11 commits intomicrosoft:mainfrom
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Andarist
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Jan 3, 2025
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@typescript-bot test it |
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Hey @jakebailey, the results of running the DT tests are ready. Everything looks the same! |
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@jakebailey Here are the results of running the user tests with tsc comparing Everything looks good! |
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@jakebailey Here they are:
tscComparison Report - baseline..pr
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@jakebailey Here are the results of running the top 400 repos with tsc comparing Everything looks good! |
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Ok, I think this one is in good shape for review. I've only made a small change to the code - I don't think it will impact any code in the wild but it might be good to rerun the extended tests. |
Andarist
commented
Jan 6, 2025
| SkipGenericFunctions = 1 << 3, // Skip single signature generic functions | ||
| IsForSignatureHelp = 1 << 4, // Call resolution for purposes of signature help | ||
| RestBindingElement = 1 << 5, // Checking a type that is going to be used to determine the type of a rest binding element | ||
| SkipReturnTypeFromBodyInference = 1 << 4, // Skip inferring from return types of context sensitive functions |
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It's separate from SkipGenericFunctions because getReturnTypeFromBody removes SkipGenericFunctions bit - so when the compiler gets to a function node with type parameters within a context-sensitive function's return it can't just use SkipGenericFunctions to skip over inferring its own return type from body.
The goal of SkipReturnTypeFromBodyInference is to persist through getReturnTypeFromBody.
Andarist
commented
Jan 6, 2025
| const inferenceContext = getInferenceContext(node); | ||
| const isReturnContextSensitive = !!node.body && (node.body.kind === SyntaxKind.Block ? forEachReturnStatement(node.body as Block, statement => !!statement.expression && isContextSensitive(statement.expression)) : isContextSensitive(node.body)); | ||
| returnType = getReturnTypeFromBody(node, checkMode | (isReturnContextSensitive ? CheckMode.SkipContextSensitive : 0)); | ||
| inferTypes(inferenceContext!.inferences, returnType, contextualReturnType); |
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alternatively, this could be handled by intra expression inference but that is order-sensitive and traditionally simple cases like this one aren't:
declare function test<T>(_: {
stuff: T,
consume: (arg: T) => void
}): void
test({
consume: (arg) => {},
stuff: 'foo' // this can come after `consume`
})So the reason I put this logic here is that it allows for the same order-independence
…ntext-sensitive-return # Conflicts: # src/compiler/checker.ts
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@typescript-bot test top999 |
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@RyanCavanaugh Here are the results of running the top 999 repos with tsc comparing Everything looks good! |
…ntext-sensitive-return
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fixes #60720
fixes #57021