Avoid inferring return and yield types from unreachable statements #55601
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typescript-bot
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the
For Uncommitted Bug
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The TypeScript team hasn't accepted the linked issue #55437. If you can get it accepted, this PR will have a better chance of being reviewed. |
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I needed this just the other day. |
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@typescript-bot test top200 |
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Heya @jakebailey, I've started to run the diff-based user code test suite on this PR at fa99df8. You can monitor the build here. Update: The results are in! |
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Heya @jakebailey, I've started to run the regular perf test suite on this PR at fa99df8. You can monitor the build here. Update: The results are in! |
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Heya @jakebailey, I've started to run the tarball bundle task on this PR at fa99df8. You can monitor the build here. |
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Heya @jakebailey, I've started to run the diff-based top-repos suite on this PR at fa99df8. You can monitor the build here. Update: The results are in! |
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Heya @jakebailey, I've started to run the parallelized Definitely Typed test suite on this PR at fa99df8. 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... Everything looks good! |
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@jakebailey Here they are:
CompilerComparison Report - baseline..pr
System info unknown
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tsserverComparison Report - baseline..pr
System info unknown
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StartupComparison Report - baseline..pr
System info unknown
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Developer Information: |
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@jakebailey Here are the results of running the top-repos suite comparing Everything looks good! |
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Hey @jakebailey, the results of running the DT tests are ready. |
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This doesn't really work for assertion functions right? Can you add a few tests around that? function throws(): never {
throw new Error();
}
export function foo() {
throws();
return 42;
}
export function bar() {
var x;
x = 1;
if (Math.random()) {
throws();
return x;
}
x = 2;
return x;
} |
Contributor
Author
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Should I just codify the current results in the test suite or would you expect those cases to work differently? It would be possible to achieve different results for them, right? I'm not sure if that's totally desirable from your PoV though. |
jakebailey
reviewed
Mar 6, 2024
…-unreachable-returns-and-yields
…-unreachable-returns-and-yields
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@typescript-bot test it |
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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 |
Collaborator
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Hey @jakebailey, the results of running the DT tests are ready. Everything looks the same! |
Collaborator
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@jakebailey Here are the results of running the user tests with tsc comparing There were infrastructure failures potentially unrelated to your change:
Otherwise... Everything looks good! |
Collaborator
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@jakebailey Here they are:
tscComparison Report - baseline..pr
System info unknown
Hosts
Scenarios
Developer Information: |
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@jakebailey Here are the results of running the top 400 repos with tsc comparing Something interesting changed - please have a look. Details
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Contributor
Author
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The above break is expected. This is the function Thrower() {
throw new Promise(() => {
// Never resolve
})
// @ts-expect-error
return null
}When considering the unreachable return statement, its type becomes Function declarations and method declarations outside of object literals are not allowed to infer |
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closes #55437