Microsoft/TypeScript
No constituent of type 'Function | (T & Function)' is callable.
Aberta
#46.066 aberto em 26 de set. de 2021
BugDomain: Error MessagesEffort: DifficultHelp Wanted
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Description
Bug Report
🔎 Search Terms
generic function union-type call-signatures
🕗 Version & Regression Information
- This is a crash
- This is the behavior in every version I tried, and I reviewed the FAQ for entries about Generics
- I was unable to test this on prior versions because _______
⏯ Playground Link
Playground link with relevant code
💻 Code
type Test = <T>(fn: T | Function) => void;
const test: Test = (fn) => {
return typeof fn === 'function' ? fn() : null;
};
// This expression is not callable.
// No constituent of type 'Function | (T & Function)' is callable.
🙁 Actual behavior
Compiler throw error: This expression is not callable. Not all constituents of type 'Function | (T & Function)' are callable.
🙂 Expected behavior
Compile success
because both 'Function | (T & Function)' are callable.