Created
May 16, 2019 18:42
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return different type based parameter with overloads
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| 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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