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Type inference for exact strings #16276

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ajcrites opened this issue Jun 5, 2017 · 3 comments
Closed

Type inference for exact strings #16276

ajcrites opened this issue Jun 5, 2017 · 3 comments
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@ajcrites
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ajcrites commented Jun 5, 2017

TypeScript Version: 2.2.2

Code

interface Css {
  position: 'absolute' | 'relative';
}
function style(rules: Css) { }

const rules = { position: 'absolute' };
style(rules);
style({ position: 'absolute' });

Expected behavior:
There should be no type issues.

Actual behavior:
style(rules) yields

Argument of type '{ position: string; }' is not assignable to parameter of type 'Css'
Types of property 'position' are incompatible

Using style({position: 'absolute'}) works fine.

@KiaraGrouwstra
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#16360 just now seemed a bit similar (about tuples instead of objects).

@mhegazy
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mhegazy commented Aug 26, 2017

duplicate of #16523 and #12955

@mhegazy mhegazy added the Duplicate An existing issue was already created label Aug 26, 2017
@mhegazy
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mhegazy commented Sep 11, 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 11, 2017
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