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przemyslawjanpietrzak/strictFunctionTypes.ts

Last active September 24, 2018 06:47
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strictFunctionTypes
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strictFunctionTypes.ts
const fn = (arg: number, cb: (string) => string) => {
return 42
}
fn(42, a => a++); // Argument of type '(a: any) => number' is not assignable to parameter of type '(string: any) => string'. Type 'number' is not assignable to type 'string'.
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