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Add an additional test for favoring the asserted type in type predicate narrowing #50065
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Merged
DanielRosenwasser
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microsoft:main
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Andarist:test/favor-asserted-type
Jul 29, 2022
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47 changes: 47 additions & 0 deletions
47
tests/baselines/reference/controlFlowFavorAssertedTypeThroughTypePredicate.symbols
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| === tests/cases/compiler/controlFlowFavorAssertedTypeThroughTypePredicate.ts === | ||
| // repro 49988#issuecomment-1192016929 | ||
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| declare function isObject(value: unknown): value is Record<string, unknown>; | ||
| >isObject : Symbol(isObject, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 0, 0)) | ||
| >value : Symbol(value, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 2, 26)) | ||
| >value : Symbol(value, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 2, 26)) | ||
| >Record : Symbol(Record, Decl(lib.es5.d.ts, --, --)) | ||
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| declare const obj1: {}; | ||
| >obj1 : Symbol(obj1, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 4, 13)) | ||
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| obj1; // {} | ||
| >obj1 : Symbol(obj1, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 4, 13)) | ||
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| if (isObject(obj1)) { | ||
| >isObject : Symbol(isObject, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 0, 0)) | ||
| >obj1 : Symbol(obj1, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 4, 13)) | ||
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| obj1; // Record<string, unknown> | ||
| >obj1 : Symbol(obj1, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 4, 13)) | ||
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| obj1['attr']; | ||
| >obj1 : Symbol(obj1, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 4, 13)) | ||
| } | ||
| obj1; // Record<string, unknown> | ||
| >obj1 : Symbol(obj1, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 4, 13)) | ||
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| declare const obj2: {} | undefined; | ||
| >obj2 : Symbol(obj2, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 12, 13)) | ||
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| obj2; // {} | undefined | ||
| >obj2 : Symbol(obj2, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 12, 13)) | ||
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| if (isObject(obj2)) { | ||
| >isObject : Symbol(isObject, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 0, 0)) | ||
| >obj2 : Symbol(obj2, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 12, 13)) | ||
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| obj2; // Record<string, unknown> | ||
| >obj2 : Symbol(obj2, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 12, 13)) | ||
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| obj2['attr']; | ||
| >obj2 : Symbol(obj2, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 12, 13)) | ||
| } | ||
| obj2; // Record<string, unknown> | undefined | ||
| >obj2 : Symbol(obj2, Decl(controlFlowFavorAssertedTypeThroughTypePredicate.ts, 12, 13)) | ||
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51 changes: 51 additions & 0 deletions
51
tests/baselines/reference/controlFlowFavorAssertedTypeThroughTypePredicate.types
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| === tests/cases/compiler/controlFlowFavorAssertedTypeThroughTypePredicate.ts === | ||
| // repro 49988#issuecomment-1192016929 | ||
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| declare function isObject(value: unknown): value is Record<string, unknown>; | ||
| >isObject : (value: unknown) => value is Record<string, unknown> | ||
| >value : unknown | ||
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| declare const obj1: {}; | ||
| >obj1 : {} | ||
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| obj1; // {} | ||
| >obj1 : {} | ||
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| if (isObject(obj1)) { | ||
| >isObject(obj1) : boolean | ||
| >isObject : (value: unknown) => value is Record<string, unknown> | ||
| >obj1 : {} | ||
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| obj1; // Record<string, unknown> | ||
| >obj1 : Record<string, unknown> | ||
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| obj1['attr']; | ||
| >obj1['attr'] : unknown | ||
| >obj1 : Record<string, unknown> | ||
| >'attr' : "attr" | ||
| } | ||
| obj1; // Record<string, unknown> | ||
| >obj1 : Record<string, unknown> | ||
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| declare const obj2: {} | undefined; | ||
| >obj2 : {} | undefined | ||
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| obj2; // {} | undefined | ||
| >obj2 : {} | undefined | ||
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| if (isObject(obj2)) { | ||
| >isObject(obj2) : boolean | ||
| >isObject : (value: unknown) => value is Record<string, unknown> | ||
| >obj2 : {} | undefined | ||
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| obj2; // Record<string, unknown> | ||
| >obj2 : Record<string, unknown> | ||
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| obj2['attr']; | ||
| >obj2['attr'] : unknown | ||
| >obj2 : Record<string, unknown> | ||
| >'attr' : "attr" | ||
| } | ||
| obj2; // Record<string, unknown> | undefined | ||
| >obj2 : Record<string, unknown> | undefined | ||
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22 changes: 22 additions & 0 deletions
22
tests/cases/compiler/controlFlowFavorAssertedTypeThroughTypePredicate.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| // @noEmit: true | ||
| // @strict: true | ||
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| // repro 49988#issuecomment-1192016929 | ||
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| declare function isObject(value: unknown): value is Record<string, unknown>; | ||
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| declare const obj1: {}; | ||
| obj1; // {} | ||
| if (isObject(obj1)) { | ||
| obj1; // Record<string, unknown> | ||
| obj1['attr']; | ||
| } | ||
| obj1; // Record<string, unknown> | ||
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| declare const obj2: {} | undefined; | ||
| obj2; // {} | undefined | ||
| if (isObject(obj2)) { | ||
| obj2; // Record<string, unknown> | ||
| obj2['attr']; | ||
| } | ||
| obj2; // Record<string, unknown> | undefined | ||
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I know it's unfair to ask this of you since there were no tests, but:
value is {}acting onRecord<string, unknown>andRecord<string, unknown> | undefined.There was a problem hiding this comment.
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No problem - I've added the requested test cases and removed those comments (I've originally kept them as they are pretty popular in your test suite)
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Yeah, I am not a fan 😅
They fall out of date with the baselines so it never made sense.