tests/cases/compiler/overloadAssignmentCompat.ts(35,1): error TS2394: Overload signature is not compatible with function implementation. ==== tests/cases/compiler/overloadAssignmentCompat.ts (1 errors) ==== // ok - overload signatures are assignment compatible with their implementation class Accessor {} function attr(name: string): string; function attr(name: string, value: string): Accessor; function attr(map: any): Accessor; function attr(nameOrMap: any, value?: string): any { if (nameOrMap && typeof nameOrMap === "object") { // handle map case return new Accessor; } else { // handle string case return "s"; } } // not ok - there's an assignment compat error function attr2(name: string): string; function attr2(name: string, value: string): Accessor; function attr2(map: any): Accessor; function attr2(nameOrMap: any, value?: string): string { if (nameOrMap && typeof nameOrMap === "object") { // handle map case return "t"; } else { // handle string case return "s"; } } // error - signatures are not assignment compatible function foo():number; ~~~~~~~~~~~~~~~~~~~~~~ !!! error TS2394: Overload signature is not compatible with function implementation. function foo():string { return "a" };