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Implicit type coersion of function to boolean in ternary operator #36921

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kenrick95 opened this issue Feb 21, 2020 · 2 comments
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Implicit type coersion of function to boolean in ternary operator #36921

kenrick95 opened this issue Feb 21, 2020 · 2 comments

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@kenrick95
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TypeScript Version: 3.7.x-dev.20200220

Search Terms: Implicit type coersion function ternary

Code

function isSomething(): boolean {
  return false
}
const haha = isSomething ? 'a' : 'b';

Expected behavior: Typescript should throw error in = isSomething ? instead of coercing isSomething to boolean

Actual behavior: Typescript coerced isSomething (function) to boolean

Playground Link: link

Related Issues:

@IllusionMH
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Fixed in #36402 (will be in 3.9)

@kenrick95
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Omg thanks a lot @IllusionMH! Apologies for this duplicate issue.

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@IllusionMH @kenrick95