TypeScript return types go missing with --fix

[zEh-]

Description

TypeScript return types go missing with --fix.

Original:

function main(): void {
  console.log('main')
}
function notVoid(): number {
  const a = 3
  return a * 2
}

Expected:

const main = (): void => {
  console.log('main')
}
const notVoid = (): number => {
  const a = 3
  return a * 2
}

Actual:

const main = () => {
  console.log('main')
};
const notVoid = () => {
  const a = 3
  return a * 2
};

[JamieMason]

This was fixed by @harelmo in #14, released in 3.1.4