prettyPrint.ts

function prettyPrint(x: unknown): string {
  if (Array.isArray(x)) {
    return "[" + x.map(prettyPrint).join(", ") + "]"
  }
  if (typeof x === "string") {
    return `"${x}"`
  }
  if (typeof x === "number") {
    return String(x)
  } 
  return "etc."
}