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donavon/someFunction.ts

Created March 6, 2021 11:27
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TypeScript
Raw
someFunction.ts
const someFunction = (arg: string | string[]) => {
if (Array.isArray(arg)) {
return arg.map<string>(someFunction);
}
return arg.toUpperCase();
};
const x = someFunction('a'); // should be type string
const arr = someFunction(['a']); // should be type string[]
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