Babel 无法编译？ typescript 中的语法

Question

我在尝试编译 typescript 时遇到了这个问题。 好像 babel 听不懂“？” node.current?.contains(event.target) 行的语法

export function useOnClickOutside(node: any, handler: any) {
  const handlerRef = useRef(handler);

  useEffect(() => {
    handlerRef.current = handler;
  }, [handler]);
  
  useEffect(() => {
    const listener = (event: { target: any }) => {
      // Do nothing if clicking ref's element or descendent elements
      if (node.current?.contains(event.target) ?? false) {
        return;
      }
      handler && handler(false);
      if (handlerRef.current) handlerRef.current();
    };
    document.addEventListener('mousedown', listener);
    return () => {
      document.removeEventListener('mousedown', listener);
    };
  }, [node, handler]);
}

babel 编译错误

Answer 1

您可能需要在 webpack 配置中包含 ts 文件的 babel 加载程序，如下所示

module.exports = {
  module: {
    rules: [
    {
     test: /\.(js|jsx|tsx|ts)$/,
     exclude: /node_modules/,
     loader: 'babel-loader'
    }
   ]
  },
}

Answer 2

安装npm i @babel/preset-env后，可以将@babel/preset-env添加到 .babelrc 的“ .babelrc ”部分，例如

{
  "presets": [
    [
      "@babel/preset-react",
      {
        "runtime": "automatic"
      }
    ],
    [
      "@babel/preset-typescript"
    ],
    [
      "@babel/preset-env",
      {
        "targets": {
          "esmodules": false
        }
      }
    ]
  ]

//some other settings follows

}

{
  "name": "typescript-near",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.16.4",
    "@testing-library/react": "^13.3.0",
    "@testing-library/user-event": "^13.5.0",
    "@types/jest": "^27.5.2",
    "@types/node": "^16.11.41",
    "@types/react": "^18.0.14",
    "@types/react-dom": "^18.0.5",
    "@types/react-router-dom": "^5.3.3",
    "babel-preset-typescript": "^7.0.0-alpha.19",
    "near-api-js": "^0.45.1",
    "react-dom": "^16.14.0",
    "react-icons": "^4.4.0",
    "react-router-dom": "^6.3.0",
    "react-scripts": "^2.1.3",
    "styled-components": "^5.3.5",
    "typescript": "^4.7.4",
    "web-vitals": "^2.1.4",
    "webpack-cli": "^4.9.2",
    "@babel/preset-env": "^7.18.6",
    "react": "^16.14.0",
    "react-router": "^5.3.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "@babel/preset-typescript": "^7.18.6",
    "@types/styled-components": "^5.1.25",
    "ts-loader": "^9.3.1",
    "webpack-cli": "^4.10.0"
  }
}

我的 package.json