Microsoft/TypeScript

Strange error: string is not a string type

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#41 918 ouverte le 10 déc. 2020

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BugDomain: Error MessagesEffort: ModerateHelp Wanted

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Description

TypeScript Version: 4.1.2

Search Terms: downlevelIteration, string, spread

Code

function test(name: string) {
    for (const _char of [...name]) {
    }
}

Run tsc on just this ts file with no extra flags (I couldn't find the right combination of playground checkboxes to simulate this.

Expected behavior: Assuming the code is wrong, the error message should probably not say that string is not a string type.

Actual behavior:

error TS2569: Type 'string' is not an array type or a string type. Use compiler option '--downlevelIteration' to allow iterating of 
iterators.

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