// Declared error codes turn into inline squiggles + a message block.
const 
const answer: numberanswer: number = "forty-two"
Type 'string' is not assignable to type 'number'.

function 
function greet(name: string): stringgreet(
(parameter) name: stringname: string) {
  return `Hi, ${
(parameter) name: stringname}`
}
function greet(name: string): stringgreet(42)
Argument of type 'number' is not assignable to parameter of type 'string'.