React - 将 @babel/preset-react (https://git.io/JfeDR) 添加到 Babel 配置的“预设”部分以启用转换

Question

I want to use react-validation component Input in my form. This is why I imported it & used inside the form as:

<Input className="form-control"
       type="text"
       placeholder="name"
       value={props.data.creatingUser.createName}
       name="createName"
       id="createName"
       onChange={props.handleAddChange}
required/>

When I try to run the application using npm start , I receive the following error in the console:

SyntaxError: E:\Projects\personal\rental-application\node_modules\react-validation\src\components\input\index.js: Support for the experimental syntax 'jsx' isn't cur rently enabled (6:3):

const Input = ({ error, isChanged, isUsed, ...props }) => (

 | ^ <input {...props} {...( isChanged && isUsed && error? { className: `is-invalid-input ${props.className}` }: { className: props.className } )} />

I have not explicitly done any babel configuration and my package.json file has the following content:

{
  "name": "rental-application",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.11.9",
    "@testing-library/react": "^11.2.3",
    "@testing-library/user-event": "^12.6.0",
    "jquery": "^3.5.1",
    "react": "^17.0.1",
    "react-dom": "^17.0.1",
    "react-scripts": "4.0.1",
    "web-vitals": "^0.2.4",
    "popper.js": "1.16.1",
    "css-loader": "^5.0.1",
    "react-bootstrap": "^1.4.3",
    "sass-loader": "^10.1.1",
    "style-loader": "^2.0.0",
    "axios": "^0.21.1",
    "react-notifications": "^1.7.2",
    "react-fontawesome": "^1.7.1",
    "react-table": "^6.11.4",
    "react-validation": "^3.0.7"
  },
  "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/plugin-transform-async-to-generator": "^7.12.1",
    "react-router-dom": "^5.2.0",
    "react-table-6": "^6.11.0"
  }
}

My project structure:

++node_modules

++public
+++index.html
+++manifest.json
+++robots.txt

++src
+++App.js
+++index.js
+++index.css

++package.json
++package-lock.json

You can see I am not using any other configuration, and I have initiated the project using create-react-app command.

Answer 1

Input in react-validation lies under build folder. But from the error it seems that you didn't imported Input properly: SyntaxError: E:\Projects\personal\rental-application\node_modules\react-validation\ src\components\input \index.js: Support for the experimental syntax 'jsx' isn't currently enabled (6:3):

Can you please check your import statement? It should be something like this:

import Input from "react-validation/build/input";

Answer 2

1st proposal

As it is suggest in this thread, run bundle exec rails webpacker:install:react . It will add that bit to the babel.config.js automatically. You will not need to manually do something.

. . . . . .

2st proposal

You should install @babel/preset-react as it is suggested in the error message.

Using npm:

npm install --save-dev @babel/preset-react

or using yarn:

yarn add @babel/preset-react --dev

See our website @babel/preset-react for more information. Ref: https://github.com/babel/babel/tree/master/packages/babel-preset-react

. . . . . .

3st proposal

Alternatively, if the first proposal doesn't work, as it is suggested in this thread , you should update babel.config.js , so it will work. So update the file as it is suggested:

  presets: [
    ['@babel/preset-env', {targets: {node: 'current'}}],
    ['@babel/preset-react', {targets: {node: 'current'}}] // add this
  ]
};