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type ${number} cannot be used to index numeric index signature #41893

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@ajafff

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@ajafff

TypeScript Version: 4.2.0-dev.20201209

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Expected behavior:

type ${number} can be used to index numeric index signature

Actual behavior:

Error: Element implicitly has an 'any' type because index expression is not of type 'number'.

Related Issues:

Code

declare let t: `${number}`;

declare let obj: {
    [key: number]: number;
}

const v = obj[t];

Playground Link: Provided

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