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GingerBear/return-type-overloads.ts

Created May 16, 2019 18:42
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return different type based parameter with overloads
Raw
return-type-overloads.ts
function foo(): null;
function foo(a: number): string;
function foo(a?) {
if (typeof a === 'number') {
return '123';
} else {
return null;
}
}
const a = foo(); // null
const b = foo(123); // string
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