Check which Javascript runtime is being used (Browser, Node, Deno or Bun).

runtime-checker.ts

function isNodeRuntime() {
  // The reason we check for both `v8` instead of `node` is because when running `process.versions` under
  // Bun, it returns `node` and `bun` version, but it doesn't use v8 engine, hence not a Node.js runtime.
  return (
    typeof process !== 'undefined' &&
    process.versions &&
    process.versions.v8
  );
}

function isDenoRuntime() {
  return typeof Deno !== 'undefined';
}

function isBunRuntime() {
  return typeof Bun !== 'undefined';
}

function isBrowser() {
  return typeof window !== 'undefined';
}