24 lines
909 B
Plaintext
24 lines
909 B
Plaintext
=== tests/cases/compiler/inferConditionalConstraintMappedMember.ts ===
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// Return keyof type without string index signature
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type KeysWithoutStringIndex<T> =
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>KeysWithoutStringIndex : KeysWithoutStringIndex<T>
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{ [K in keyof T]: string extends K ? never : K } extends { [_ in keyof T]: infer U }
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? U
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: never
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// Only "foo" | "bar" as expected, [string] index signature removed
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type test = KeysWithoutStringIndex<{ [index: string]: string; foo: string; bar: 'baz' }>
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>test : never
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>index : string
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>foo : string
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>bar : "baz"
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// KeysWithoutStringIndex<T> will always be a subset of keyof T, but is reported as unassignable
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export type RemoveIdxSgn<T> = Pick<T, KeysWithoutStringIndex<T>>
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>RemoveIdxSgn : RemoveIdxSgn<T>
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// ERROR:
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// Type 'KeysWithoutStringIndex<T>' does not satisfy the constraint 'keyof T'.
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// Type 'unknown' is not assignable to type 'keyof T'.(2344)
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