text: //// [strictTypeofUnionNarrowing.ts]
  function stringify1(anything: { toString(): string } | undefined): string {
      return typeof anything === "string" ? anything.toUpperCase() : "";
  }
  
  function stringify2(anything: {} | undefined): string {
      return typeof anything === "string" ? anything.toUpperCase() : "";
  }
  
  function stringify3(anything: unknown | undefined): string { // should simplify to just `unknown` which should narrow fine
      return typeof anything === "string" ? anything.toUpperCase() : "";
  }
  
  function stringify4(anything: { toString?(): string } | undefined): string {
      return typeof anything === "string" ? anything.toUpperCase() : "";
  }
  
  
  //// [strictTypeofUnionNarrowing.js]
  "use strict";
  function stringify1(anything) {
      return typeof anything === "string" ? anything.toUpperCase() : "";
  }
  function stringify2(anything) {
      return typeof anything === "string" ? anything.toUpperCase() : "";
  }
  function stringify3(anything) {
      return typeof anything === "string" ? anything.toUpperCase() : "";
  }
  function stringify4(anything) {
      return typeof anything === "string" ? anything.toUpperCase() : "";
  }
  