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asyncを使用したコードをjestでテストすると「regeneratorRuntime is not defined」エラーが発生

Posted at

確認環境

  • Node.js: 10.16.0
  • Jest: 24.9.0
  • @babel/core: 7.7.5

エラー内容

jestでテスト実行すると、asyncの記述の部分で、以下のようなエラーが発生しました。

    ReferenceError: regeneratorRuntime is not defined

       9 | }
      10 | 
    > 11 | const main = async () => {
         |              ^

対応

.babelrcにて、babelのターゲットを指定することで解決しました。
変更前:

.babelrc
{
  "presets": [
    "@babel/preset-env"
  ]
}

変更後:

.babelrc
{
  "presets": [
    [
      "@babel/preset-env", {
        "targets": {
          "node": "current"
        }
      }
    ]
  ]
}

以上。

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