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Bug: incorrect contextual typing on yield expression of generator function as discriminate of a union #51187

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#51196
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Bug: incorrect contextual typing on yield expression of generator function as discriminate of a union#51187
#51196
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rbuckton
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Description

@shigma
Shigma (shigma)
opened on Oct 15, 2022

Bug Report

🔎 Search Terms

generator function union contextual typing yield expression

🕗 Version & Regression Information

4.8.4

⏯ Playground Link

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💻 Code

type Action = () => (Generator<string, string, string[]> | string)

const b: Action = function* () {
    // expect `string[]`, actual `never`
    const c = yield ''
    return ''
}

🙁 Actual behavior

never

🙂 Expected behavior

string[]

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