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const string is not recognized as string literal type in map function #17959

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k8w opened this issue Aug 22, 2017 · 3 comments
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const string is not recognized as string literal type in map function #17959

k8w opened this issue Aug 22, 2017 · 3 comments
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@k8w
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k8w commented Aug 22, 2017

TypeScript Version: 2.4.0 / nightly (2.5.0-dev.201xxxxx)
2.4.2
Code

type AABB = 'AA' | 'BB';
let arr: any[];
let arr2: AABB[] = arr.map(v => 'AA'); 
let arr3: AABB[] = arr.map(v => 'BB');

Expected behavior:
No Error

Actual behavior:
Error:

Type 'string[]' is not assignable to type 'AABB[]'.
@kitsonk
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kitsonk commented Aug 22, 2017

Duplicate of #9659

@mhegazy
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mhegazy commented Aug 22, 2017

a better one is #11152

@mhegazy mhegazy added the Duplicate An existing issue was already created label Aug 22, 2017
@mhegazy
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mhegazy commented Sep 5, 2017

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.

@mhegazy mhegazy closed this as completed Sep 5, 2017
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@kitsonk @k8w @mhegazy