Functions & Return Types

TypeScript is not super happy that we have these things andthat they're not typed.So we're going to give those types here.

never

• represents the type of values that never occur.
• For example, never is the return type for a function expression or an arrow function expression that always throws an exception or one that never returns.

function error(message: string): never {
  throw new Error(message);
}

void

• The absence of having any type at all.
• For example, declaring variables of type void is not useful because you can only assign undefined or null to them.

function log(message: string): void {
  console.log(message);
}