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Type alias as mapping key #19404

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Yamakaky opened this issue Oct 22, 2017 · 2 comments
Closed

Type alias as mapping key #19404

Yamakaky opened this issue Oct 22, 2017 · 2 comments
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@Yamakaky
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TypeScript Version: 2.7.0-dev.20171021

Code

type Id = number

interface Mapping {
    [key: Id]: string,
}

Expected behavior:

Compiles correctly as Id is a number

Actual behavior:

error TS1023: An index signature parameter type must be 'string' or 'number'.
@jcalz
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jcalz commented Oct 22, 2017

Duplicate of #7374

@Yamakaky
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Oops, sorry

@mhegazy mhegazy added the Duplicate An existing issue was already created label Oct 23, 2017
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@jcalz @Yamakaky @mhegazy