Fix the error: Argument of type 'true' is not assignable to parameter of type 'string | number'

Question

Here is the following code:
```typescript
function bar(x: string | number) : number {
    if ('number' === typeof x) {
        return 0;
    }
    return 1;
}
console.log(bar(4), bar('8'), bar('a'), bar(true));
```
What will this code produce?

Accepted Answer

Argument of type 'true' is not assignable to parameter of type 'string | number'

Answer

0 1 1 1

Answer

0 1 1 0

Answer

0 1 1 1

Question from the Angular 4 (legacy) test

Fix the error: Argument of type 'true' is not assignable to parameter of type 'string | number'