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Compute flow types for function declarations #58411
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65 changes: 65 additions & 0 deletions
65
tests/baselines/reference/assertionTypePredicatesOnFunction1.symbols
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| //// [tests/cases/conformance/controlFlow/assertionTypePredicatesOnFunction1.ts] //// | ||
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| === assertionTypePredicatesOnFunction1.ts === | ||
| // https://github.com/microsoft/TypeScript/issues/41232 | ||
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| interface LabelledFunction { | ||
| >LabelledFunction : Symbol(LabelledFunction, Decl(assertionTypePredicatesOnFunction1.ts, 0, 0)) | ||
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| label: string; | ||
| >label : Symbol(LabelledFunction.label, Decl(assertionTypePredicatesOnFunction1.ts, 2, 28)) | ||
| } | ||
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| declare function assignLabel<T extends (...args: never) => unknown>( | ||
| >assignLabel : Symbol(assignLabel, Decl(assertionTypePredicatesOnFunction1.ts, 4, 1)) | ||
| >T : Symbol(T, Decl(assertionTypePredicatesOnFunction1.ts, 6, 29)) | ||
| >args : Symbol(args, Decl(assertionTypePredicatesOnFunction1.ts, 6, 40)) | ||
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| fn: T, | ||
| >fn : Symbol(fn, Decl(assertionTypePredicatesOnFunction1.ts, 6, 68)) | ||
| >T : Symbol(T, Decl(assertionTypePredicatesOnFunction1.ts, 6, 29)) | ||
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| label: string, | ||
| >label : Symbol(label, Decl(assertionTypePredicatesOnFunction1.ts, 7, 8)) | ||
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| ): asserts fn is T & LabelledFunction; | ||
| >fn : Symbol(fn, Decl(assertionTypePredicatesOnFunction1.ts, 6, 68)) | ||
| >T : Symbol(T, Decl(assertionTypePredicatesOnFunction1.ts, 6, 29)) | ||
| >LabelledFunction : Symbol(LabelledFunction, Decl(assertionTypePredicatesOnFunction1.ts, 0, 0)) | ||
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| function a() {} | ||
| >a : Symbol(a, Decl(assertionTypePredicatesOnFunction1.ts, 9, 38)) | ||
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| assignLabel(a, "a"); | ||
| >assignLabel : Symbol(assignLabel, Decl(assertionTypePredicatesOnFunction1.ts, 4, 1)) | ||
| >a : Symbol(a, Decl(assertionTypePredicatesOnFunction1.ts, 9, 38)) | ||
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| a.label; | ||
| >a.label : Symbol(LabelledFunction.label, Decl(assertionTypePredicatesOnFunction1.ts, 2, 28)) | ||
| >a : Symbol(a, Decl(assertionTypePredicatesOnFunction1.ts, 9, 38)) | ||
| >label : Symbol(LabelledFunction.label, Decl(assertionTypePredicatesOnFunction1.ts, 2, 28)) | ||
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| const b = function () {}; | ||
| >b : Symbol(b, Decl(assertionTypePredicatesOnFunction1.ts, 15, 5)) | ||
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| assignLabel(b, "b"); | ||
| >assignLabel : Symbol(assignLabel, Decl(assertionTypePredicatesOnFunction1.ts, 4, 1)) | ||
| >b : Symbol(b, Decl(assertionTypePredicatesOnFunction1.ts, 15, 5)) | ||
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| b.label; | ||
| >b.label : Symbol(LabelledFunction.label, Decl(assertionTypePredicatesOnFunction1.ts, 2, 28)) | ||
| >b : Symbol(b, Decl(assertionTypePredicatesOnFunction1.ts, 15, 5)) | ||
| >label : Symbol(LabelledFunction.label, Decl(assertionTypePredicatesOnFunction1.ts, 2, 28)) | ||
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| const c = () => {}; | ||
| >c : Symbol(c, Decl(assertionTypePredicatesOnFunction1.ts, 19, 5)) | ||
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| assignLabel(c, "c"); | ||
| >assignLabel : Symbol(assignLabel, Decl(assertionTypePredicatesOnFunction1.ts, 4, 1)) | ||
| >c : Symbol(c, Decl(assertionTypePredicatesOnFunction1.ts, 19, 5)) | ||
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| c.label; | ||
| >c.label : Symbol(LabelledFunction.label, Decl(assertionTypePredicatesOnFunction1.ts, 2, 28)) | ||
| >c : Symbol(c, Decl(assertionTypePredicatesOnFunction1.ts, 19, 5)) | ||
| >label : Symbol(LabelledFunction.label, Decl(assertionTypePredicatesOnFunction1.ts, 2, 28)) | ||
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97 changes: 97 additions & 0 deletions
97
tests/baselines/reference/assertionTypePredicatesOnFunction1.types
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| //// [tests/cases/conformance/controlFlow/assertionTypePredicatesOnFunction1.ts] //// | ||
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| === assertionTypePredicatesOnFunction1.ts === | ||
| // https://github.com/microsoft/TypeScript/issues/41232 | ||
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| interface LabelledFunction { | ||
| label: string; | ||
| >label : string | ||
| > : ^^^^^^ | ||
| } | ||
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| declare function assignLabel<T extends (...args: never) => unknown>( | ||
| >assignLabel : <T extends (...args: never) => unknown>(fn: T, label: string) => asserts fn is T & LabelledFunction | ||
| > : ^ ^^^^^^^^^^^^^ ^^ ^^^^^ ^^ ^^ ^^ ^^ ^^^^^ | ||
| >args : never | ||
| > : ^^^^^ | ||
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| fn: T, | ||
| >fn : T | ||
| > : ^ | ||
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| label: string, | ||
| >label : string | ||
| > : ^^^^^^ | ||
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| ): asserts fn is T & LabelledFunction; | ||
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| function a() {} | ||
| >a : () => void | ||
| > : ^^^^^^^^^^ | ||
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| assignLabel(a, "a"); | ||
| >assignLabel(a, "a") : void | ||
| > : ^^^^ | ||
| >assignLabel : <T extends (...args: never) => unknown>(fn: T, label: string) => asserts fn is T & LabelledFunction | ||
| > : ^ ^^^^^^^^^^^^^ ^^ ^^^^^^^^^^^^^^ ^^ ^^ ^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| >a : () => void | ||
| > : ^^^^^^^^^^ | ||
| >"a" : "a" | ||
| > : ^^^ | ||
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| a.label; | ||
| >a.label : string | ||
| > : ^^^^^^ | ||
| >a : (() => void) & LabelledFunction | ||
| > : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| >label : string | ||
| > : ^^^^^^ | ||
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| const b = function () {}; | ||
| >b : () => void | ||
| > : ^^^^^^^^^^ | ||
| >function () {} : () => void | ||
| > : ^^^^^^^^^^ | ||
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| assignLabel(b, "b"); | ||
| >assignLabel(b, "b") : void | ||
| > : ^^^^ | ||
| >assignLabel : <T extends (...args: never) => unknown>(fn: T, label: string) => asserts fn is T & LabelledFunction | ||
| > : ^ ^^^^^^^^^^^^^ ^^ ^^^^^^^^^^^^^^ ^^ ^^ ^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| >b : () => void | ||
| > : ^^^^^^^^^^ | ||
| >"b" : "b" | ||
| > : ^^^ | ||
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| b.label; | ||
| >b.label : string | ||
| > : ^^^^^^ | ||
| >b : (() => void) & LabelledFunction | ||
| > : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| >label : string | ||
| > : ^^^^^^ | ||
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| const c = () => {}; | ||
| >c : () => void | ||
| > : ^^^^^^^^^^ | ||
| >() => {} : () => void | ||
| > : ^^^^^^^^^^ | ||
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| assignLabel(c, "c"); | ||
| >assignLabel(c, "c") : void | ||
| > : ^^^^ | ||
| >assignLabel : <T extends (...args: never) => unknown>(fn: T, label: string) => asserts fn is T & LabelledFunction | ||
| > : ^ ^^^^^^^^^^^^^ ^^ ^^^^^^^^^^^^^^ ^^ ^^ ^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| >c : () => void | ||
| > : ^^^^^^^^^^ | ||
| >"c" : "c" | ||
| > : ^^^ | ||
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| c.label; | ||
| >c.label : string | ||
| > : ^^^^^^ | ||
| >c : (() => void) & LabelledFunction | ||
| > : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| >label : string | ||
| > : ^^^^^^ | ||
|
|
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25 changes: 25 additions & 0 deletions
25
tests/cases/conformance/controlFlow/assertionTypePredicatesOnFunction1.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| // @strict: true | ||
| // @noEmit: true | ||
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| // https://github.com/microsoft/TypeScript/issues/41232 | ||
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| interface LabelledFunction { | ||
| label: string; | ||
| } | ||
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| declare function assignLabel<T extends (...args: never) => unknown>( | ||
| fn: T, | ||
| label: string, | ||
| ): asserts fn is T & LabelledFunction; | ||
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| function a() {} | ||
| assignLabel(a, "a"); | ||
| a.label; | ||
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| const b = function () {}; | ||
| assignLabel(b, "b"); | ||
| b.label; | ||
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| const c = () => {}; | ||
| assignLabel(c, "c"); | ||
| c.label; |
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tbf... if this is something the plan would like to pull in, we probably should enable narrowing on just anything.
assertsmake it possible to expand all non-nullable types