unpexpected : due to type definition in TS

TS file method with datatype in function doesn't work.

myFunction inside somefile.ts, which is rewired
**Doesn't work**
```
function myFunction(a: number, b: number) {
  return a + b;
}
```
Error thrown:  SyntaxError: Unexpected token ':'


**Works**
```
function myFunction(a, b) {
  return a + b;
}

```
