Microsoft/TypeScript
Voir sur GitHubIncorrect emitted declaration for unique symbol re-assignment
Open
#62 305 ouverte le 19 août 2025
BugDomain: Declaration EmitHelp Wanted
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- (48 455 stars)
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Description
🔎 Search Terms
"TS1332", "unique symbol readonly", "function readonly property"
🕗 Version & Regression Information
N/A.
⏯ Playground Link
💻 Code
const mySymbol = Symbol('Symbols.mySymbol');
const Symbols = {
mySymbol
} as const;
function myFunction() {}
myFunction.mySymbol = Symbols.mySymbol;
/*
SEE `.D.TS` TAB. THE ABOVE CODE PRODUCES:
declare namespace myFunction {
var mySymbol: unique symbol;
}
WHICH IS AN ERROR (TS1332: A variable whose type is a 'unique symbol' type must be const)
*/
export {myFunction}
🙁 Actual behavior
Compiler produces:
declare namespace myFunction {
var mySymbol: unique symbol;
}
🙂 Expected behavior
Should be:
declare namespace myFunction {
const mySymbol: unique symbol;
}
Additional information about the issue
Behaves differently when not in a module (remove export {myFunction} in the Playground)