Jest錯誤：SyntaxError: 無法在模組外部使用import語句

Question

我正在使用 React 和 Typescript。

在我的測試檔案中，我嘗試渲染一個元件

test("Render Header", () => {
  render(<Header />);
});

標頭元件正在使用 actions.tsx 中的操作建立器

import { loadRepo } from "../../redux/actions";
dispatch(loadRepo());

loadRepo 是使用 axios 的非同步操作建立器。我的測試拋出錯誤，因為我在 actions.tsx 中導入了 axios。錯誤如下：無法在模組外部使用 import 語句。

我嘗試設定 babel 和 jest 配置。這是我所擁有的。

babel.config.js

module.exports = {
  presets: [["@babel/preset-env", { targets: { node: "current" } }], "@babel/preset-react", "@babel/preset-typescript"],
  plugins: [],
};

jest.config.js

module.exports = {
  setupFilesAfterEnv: ["@testing-library/jest-dom/extend-expect"],
  moduleNameMapper: {
    "\.(css|less|scss|sass)$": "identity-obj-proxy",
  },
  transform: {
    "^.+\.(js|jsx|ts|tsx)$": "babel-jest",
  },
};

package.json

"dependencies": {
    "@testing-library/user-event": "^13.5.0",
    "@types/node": "^16.18.23",
    "@types/react": "^18.0.35",
    "@types/react-dom": "^18.0.11",
    "axios": "^1.3.5",
    "bootstrap": "^5.2.3",
    "react": "^18.2.0",
    "react-bootstrap": "^2.7.3",
    "react-dom": "^18.2.0",
    "react-redux": "^8.0.5",
    "react-scripts": "5.0.1",
    "redux": "^4.2.1",
    "redux-thunk": "^2.4.2",
    "typescript": "^4.9.5",
    "web-vitals": "^2.1.4"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "@babel/core": "^7.21.4",
    "@babel/preset-env": "^7.21.4",
    "@babel/preset-react": "^7.18.6",
    "@babel/preset-typescript": "^7.21.4",
    "@testing-library/jest-dom": "^5.16.5",
    "@testing-library/react": "^14.0.0",
    "babel-jest": "^29.5.0",
    "jest": "^27.5.1"
  }

Answer 1

我可以透過將下面的程式碼新增至 package.json 來強制 jest 導入 commonjs axios 建置來修復此錯誤

"jest": {
    "moduleNameMapper": {
      "axios": "axios/dist/node/axios.cjs"
    }
  },