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Incorrect index signature parameter type error #18759

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mbrodersen opened this issue Sep 26, 2017 · 1 comment
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Incorrect index signature parameter type error #18759

mbrodersen opened this issue Sep 26, 2017 · 1 comment
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@mbrodersen
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Version

$ ./node_modules/typescript/bin/tsc --version
Version 2.4.2

Code

type ClientId = number;

interface Clients {[key:ClientId]:any};

Expected behavior

No compiler errors.

Actual behavior

error TS1023: An index signature parameter type must be 'string' or 'number'.

Comment

ClientId is a number and Typescript is using structural typing - not nominative typing.
@RyanCavanaugh RyanCavanaugh added the Duplicate An existing issue was already created label Sep 26, 2017
@RyanCavanaugh
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Duplicate #14934 and many others

@microsoft microsoft locked and limited conversation to collaborators Jun 14, 2018
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@mbrodersen @RyanCavanaugh