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[英]Now.sh build breaking due to: Support for the experimental syntax 'decorators-legacy' isn't currently enabled
[英]Syntax error - Support for the experimental syntax 'decorators-legacy' isn't currently enabled
我正在尝试使用装饰器构建 JS 反应项目。 我的 .babelrc 看起来像这样:
{
"presets": [
"@babel/preset-env",
"@babel/preset-react",
],
"plugins": [
"@babel/plugin-transform-runtime",
"@babel/plugin-transform-object-assign",
[
"@babel/plugin-proposal-decorators",
{
"legacy": true
}
],
["@babel/plugin-proposal-class-properties", { "loose": true }]
]
}
添加@babel/plugin-proposal-decorators 的问题又出现了。
我正在使用 babel 7、webpack 4 和 react 16.5
webpack.config.js:
const path = require("path");
const webpack = require("webpack");
const componentName = "reports-desktop";
const publicFolderRelativePath = "../../../../../../public/js";
const ignorePlugin = new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/);
module.exports = {
entry: './reports-desktop.js'
,
output: {
path: path.resolve(__dirname, publicFolderRelativePath),
filename: `${componentName}.js`
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: "babel-loader"
}
}
]
},
plugins: [
ignorePlugin
]
};
包.json:
{
"name": "captain",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"watch": "webpack -w --mode development --progress --color --display-error-details",
"build": "webpack --mode production"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"@babel/core": "^7.0.0",
"@babel/plugin-proposal-class-properties": "^7.0.0",
"@babel/plugin-proposal-decorators": "^7.0.0",
"@babel/plugin-transform-object-assign": "^7.0.0",
"@babel/plugin-transform-runtime": "^7.0.0",
"@babel/preset-env": "^7.0.0",
"@babel/preset-react": "^7.0.0",
"@babel/preset-stage-1": "^7.0.0",
"@babel/preset-stage-2": "^7.0.0",
"babel-loader": "^8.0.2",
"babel-plugin-transform-decorators": "^6.24.1",
"react": "^16.5.0",
"react-dom": "^16.5.0",
"react-redux": "^5.0.7",
"react-router-dom": "^4.3.1",
"redux": "^4.0.0",
"webpack": "^4.17.3",
"webpack-cli": "^3.1.0"
},
"dependencies": {
"axios": "^0.18.0",
"dropzone": "^5.5.1",
"lodash": "^4.17.10",
"moment": "^2.22.2",
"prop-types": "^15.6.2",
"react-addons-update": "^15.6.2",
"react-bootstrap": "^0.32.4",
"react-datetime": "^2.15.0",
"react-dnd": "^5.0.0",
"react-dnd-html5-backend": "^5.0.1",
"react-media": "^1.8.0",
"react-tooltip": "^3.8.1"
}
}
我可能用错了@babel/plugin-proposal-decorators 吗? 正如文档中所说,这应该可以解决我的问题,但它仍然出现。
我遇到了同样的问题,但我能够通过运行npm install --save-dev @babel/plugin-proposal-decorators
并添加["@babel/plugin-proposal-decorators", { "legacy": true }]
到我的.babelrc
的插件部分。
.babelrc
的插件部分,对我来说,现在看起来像这样:
"plugins": [
["@babel/plugin-proposal-decorators", { "legacy": true }]
]
首先,执行命令:
npm install customize-cra react-app-rewired @babel/plugin-proposal-decorators --save
在项目根目录创建一个新文件config-overrides.js
,然后执行以下命令:
const { override, addDecoratorsLegacy } = require('customize-cra');
module.exports = override(
addDecoratorsLegacy()
);
另外,编辑你的package.json
文件:
"scripts": {
"start": "react-app-rewired start",
"build": "react-app-rewired build",
"test": "react-app-rewired test",
"eject": "react-app-rewired eject"
},
然后重新启动。
取自mobxjs 。 如果您仍然遇到问题,请参阅此。 它帮助了我。
babel 7 的示例配置,在装饰器遗留模式下:
//.babelrc
{
"presets": ["@babel/preset-env"],
"plugins": [
["@babel/plugin-proposal-decorators", { "legacy": true }],
["@babel/plugin-proposal-class-properties", { "loose": true }]
]
}
请注意插件顺序很重要,plugin-proposal-decorators 应该是你插件列表中的第一个插件
"devDependencies": {
"@babel/core": "^7.1.0",
"@babel/plugin-proposal-class-properties": "^7.1.0",
"@babel/plugin-proposal-decorators": "^7.1.0",
"@babel/preset-env": "^7.1.0"
}
非传统模式装饰器(第 2 阶段)正在进行中,请参阅 #1732
编辑:更新配置以显示 babel 7 的非测试版配置
我用yarn add @babel/plugin-proposal-decorators
修复了这个问题
然后我在plugins
部分的babel.config.js
中添加了以下内容:
[
require('@babel/plugin-proposal-decorators').default,
{
legacy: true
}
],
最后我需要重新启动我的 webpack 开发服务器。
我还没有测试过这个,但就像@christopher bradshaw 回答说的那样,根据 babel 网站,如果你使用.babelrc
进行配置,然后将以下内容添加到"plugins"
部分:
["@babel/plugin-proposal-decorators", { "legacy": true }]
如果您在将 ReactJS 与 MobX 一起使用时遇到此错误,请不要启用装饰器语法,而是利用 MobX 的内置装饰实用程序将装饰器应用于您的类/对象。
别:
import { observable, computed, action } from "mobx";
class Timer {
@observable start = Date.now();
@observable current = Date.now();
@computed
get elapsedTime() {
return this.current - this.start + "milliseconds";
}
@action
tick() {
this.current = Date.now();
}
}
做:
import { observable, computed, action, decorate } from "mobx";
class Timer {
start = Date.now();
current = Date.now();
get elapsedTime() {
return this.current - this.start + "milliseconds";
}
tick() {
this.current = Date.now();
}
}
decorate(Timer, {
start: observable,
current: observable,
elapsedTime: computed,
tick: action
});
不幸的是,上述解决方案都不适用于我。 因为他们需要你先运行npm run eject
并且......我不想那样做。 要在运行时更改和覆盖 webpack 的配置,有一个名为react-app-rewired
rewired 的包,它应该是这样使用的:
首先安装所需的依赖项:
npm i --save-dev customize-cra react-app-rewired
然后将一个名为config-overrides.js
的新文件添加到具有此内容的项目的根文件夹中,以启用遗留装饰器 babel 插件:
const {
override,
addDecoratorsLegacy,
disableEsLint
} = require("customize-cra");
module.exports = override(
// enable legacy decorators babel plugin
addDecoratorsLegacy(),
// disable eslint in webpack
disableEsLint()
);
最后更改package.json
文件以使用react-app-rewired
:
"scripts": {
"start": "react-app-rewired start",
"build": "react-app-rewired build",
"test": "react-app-rewired test",
"eject": "react-app-rewired eject"
},
现在像往常一样运行npm start
并享受它!
包.json
"@babel/core": "^7.2.2",
"@babel/plugin-proposal-class-properties": "^7.1.0",
"@babel/plugin-proposal-decorators": "^7.1.0",
"@babel/preset-env": "^7.2.3",
"@babel/preset-react": "^7.0.0",
"@babel/register": "^7.0.0",
"babel-loader": "^8.0.5"
webpack.config.js
presets: ["@babel/preset-env", "@babel/preset-react"]
.babelrc
{
"presets": [
"@babel/preset-env",
"@babel/preset-react"
],
"plugins": [
["@babel/plugin-proposal-decorators", { "legacy": true }],
["@babel/plugin-proposal-class-properties", { "loose": true }]
]
}
在 2020 年将Mobx与Babel一起使用......
npm i babel-preset-mobx
module.exports = {
presets: ['other-presets', 'mobx'],
};
因此,只需安装mobx
预设并将其添加到presets
数组内的 babel 配置文件中。 例如在babel.config.js
等中。
截至 2021 年,使用 Create React App 4.0,只需执行以下步骤。
确保您没有弹出。
npm i --save-dev customize-cra react-app-rewired
添加config-overrides.js
:
const { addDecoratorsLegacy, override } = require('customize-cra')
module.exports = override(addDecoratorsLegacy())
babel.config.js
:module.exports = {
plugins: [['@babel/plugin-proposal-decorators', { legacy: true }]],
}
package.json
/ scripts 部分并搜索替换react-scripts
-> react-app-rewired
。"scripts": {
"start": "react-app-rewired start",
"build": "react-app-rewired build",
"test": "react-app-rewired test",
}
在此之后, start
、 build
和test
命令都将与代码库一起使用。
我尝试安装babel-plugin-transform-inline-environment-variables
并且它起作用了。
npm install babel-plugin-transform-inline-environment-variables
更名.babelrc
到babel.config.json
和它的工作!
从 2021 年开始,如果您已经“运行 Eject”,请编辑路径“/config/jest/BabelTransform”下名为“babelTransform”的文件,如下所示:
...
module.exports = babelJest.createTransformer({
presets: [
[
require.resolve('babel-preset-react-app'),
{
runtime: hasJsxRuntime ? 'automatic' : 'classic',
},
],
],
"plugins": [
[
"@babel/plugin-proposal-decorators",
{
"legacy": true,
}
]
],
babelrc: false,
configFile: false,
});
...
它奏效了。
"@babel/plugin-proposal-decorators": "^7.3.0",
"@babel/preset-flow": "^7.0.0"
module.exports = {
"presets": [
"module:metro-react-native-babel-preset",
"@babel/preset-flow"
],
"plugins": [
["@babel/plugin-proposal-decorators", { "legacy" : true }],
["@babel/plugin-proposal-class-properties", { "loose" : true }],
]
}
我按照以下步骤操作并且有效:
1.
npm i --save-dev customize-cra react-app-rewired @babel/plugin-proposal- decorators
const { addDecoratorsLegacy, override } = require('customize-cra') module.exports = override(addDecoratorsLegacy())
"scripts": { "start": "react-app-rewired start", "build": "react-app-rewired build", "test": "react-app-rewired test", "eject": "react-scripts eject" },
所有学分都转到这篇文章: https ://www.tderflinger.com/en/litelement-react-app
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