目标:我有一个简单的React组件,有两个导入:react和prop-types,我正在尝试将它发布到npm.
import React, { Component } from 'react';
import PropTypes from 'prop-types';
class MyComponent extends Component {
...
}
export default MyComponent;
问题:我以前从未发表任何内容,所以我不确定如何设置一切.下面是我尝试过的 – 当我尝试使用npm链接测试它时,我可以成功导入组件但是一旦我尝试使用它,它就会给我以下错误:
Element type is invalid: expected a string (for built-in components)
or a class/function (for composite components) but got: object. You
likely forgot to export your component from the file it’s defined in,
or you might have mixed up default and named imports.
文件结构:
├── node_modules/
├── lib/
| ── index.js <--- this is where webpack builds to
├── src/
| ── index.js <--- this is the react component
|
├── package.json
├── webpack.config.js
├── .babelrc
├── .npmignore
├── .gitignore
的package.json:
{
"name": "...",
"version": "1.0.0",
"description": "...",
"main": "lib/index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"build": "webpack",
"start": "webpack-dev-server --open"
},
"repository": {
"type": "git",
"url": "..."
},
"author": "...",
"license": "MIT",
"bugs": {
"url": "..."
},
"homepage": "...",
"dependencies": {
"prop-types": "^15.0.0"
},
"devDependencies": {
"babel-core": "^6.26.0",
"babel-loader": "^7.1.2",
"babel-plugin-transform-class-properties": "^6.24.1",
"babel-plugin-transform-object-rest-spread": "^6.26.0",
"babel-preset-env": "^1.6.1",
"babel-preset-react": "^6.24.1",
"webpack": "^3.10.0",
},
"peerDependencies": {
"react": "^15.0.0 || ^16.0.0",
"react-dom": "^15.0.0 || ^16.0.0"
}
}
webpack文件:
const path = require('path');
module.exports = {
entry: './src/index.js',
output: {
path: path.resolve(__dirname, 'lib'),
filename: 'index.js'
},
module: {
rules: [
{
test: /\.(js)$/,
use: 'babel-loader'
}
]
},
externals: {
'react': 'commonjs react',
'react-dom' : 'commonjs react-dom'
}
};
.babelrc:
{
"presets": ["env", "react"],
"plugins": ["transform-class-properties", "transform-object-rest-spread"]
}
输入:
而且,为了澄清,我没有混合默认和命名导入,该包被导入为默认导入:
import MyComponent from 'my-component';
最佳答案 webpack配置选项output.libraryTarget可用于告诉webpack它应该创建的构建类型:
>“commonjs2”:输入点的返回值将分配给module.exports
>“umd”:导致与CommonJS,AMD和老式脚本标签/全局变量一起使用的构建(信用到@JoeClay)
请参阅此处的文档:https://webpack.js.org/configuration/output/#module-definition-systems
这些设置会将组件导出为可以根据需要导入的CommonJS模块.