webpack 5のエラー遭遇まとめ

// package.json内
{
  "exports": {
    ".": {
      "browser": "./$esm/index.js",
      "default": "./$cjs/index.js", // 落ちます
      "import": "./$esm/index.js",
      "node": "./$cjs/index.js"
    }
  }
}

Module not found: Error: Default condition should be last one