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React躓きメモ

Last updated at Posted at 2020-11-26

###Async callback was not invoked within the 5000ms timeout specified by jest.setTimeoutでjestのテストが上手くいかないケース

it("テストネーム", async () => {
  // settimeoutを繰り返すようなテスト
}, 時間);

上記のように、itの第3引数に時間を入れることで上手くいくらしい

###useEffectがstateなどで何度もレンダリングされてしまう。

https://qiita.com/k-penguin-sato/items/9373d87c57da3b74a9e
以下のように第2引数をから配列にすればいいらしい。

useEffect(() => {
  // 処理
}, []);

###jestでカバレッジが解消されない
循環参照されているのが原因だったため、コーディングのファイルの位置関係を見直すこと。

window.visualViewportでエラーが発生してしまう。

https://r17n.page/2019/11/21/fix-typescript-window-object-access-error/
https://dev.classmethod.jp/articles/typings-of-window-object/

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