Laravel：目前未启用对实验性语法 'classProperties' 的支持

Question

在我的 resource/app.js 中，我需要自己编写的验证脚本。我在编译 (npm 运行 dev) 我的 javascript 文件时收到以下警告。

Module build failed (from ./node_modules/babel-loader/lib/index.js):
SyntaxError: /resources/js/myvendor/small-form-validator.js: Support for the experimental syntax 'classProperties' isn't currently enabled (2:13):

我的文件：

app.js

require('./bootstrap');
require('./myvendor/small-form-validator');

/resources/js/myvendor/small-form-validator.js

class SmallFormValidator {
    errMsgs = {
        required: 'This field is required!',
        string: 'Not valid string.',
        ...

我的package.json

    "private": true,
    "scripts": {
        "dev": "npm run development",
        "development": "mix",
        "watch": "mix watch",
        "watch-poll": "mix watch -- --watch-options-poll=1000",
        "hot": "mix watch --hot",
        "prod": "npm run production",
        "production": "mix --production"
    },
    "devDependencies": {
        "axios": "^0.21",
        "bootstrap": "^4.0.0",
        "jquery": "^3.2",
        "laravel-mix": "^6.0.6",
        "lodash": "^4.17.19",
        "popper.js": "^1.12",
        "postcss": "^8.1.14",
        "resolve-url-loader": "^3.1.0",
        "sass": "^1.15.2",
        "sass-loader": "^8.0.0"
    }
}

系统报错errMsgs = {...}后的赋值运算符（="字符）。

问题是我用 Class 风格而不是原型风格写我的 javascript 吗？

已更新

我的解决方案是在根目录中创建一个新的 .babelrc 文件，其中包含加载 Babel plugin-proposal-class-properties 插件的命令。

{
  "plugins": ["@babel/plugin-proposal-class-properties"]
}

看codedge的正确答案！

Answer 1

您需要在项目的根目录中创建一个.babelrc并添加

{
  "plugins": ["@babel/plugin-proposal-class-properties"]
}

然后运行 npm install --save-dev @babel/plugin-proposal-class-properties安装包然后npm run watch（分别npm run dev）编译一切。

Laravel：目前未启用对实验性语法 'classProperties' 的支持

Laravel: Support for the experimental syntax 'classProperties' isn't currently enabled

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