我已经创建了名称为“ create-react-app-npm”的react应用。在./src/index.js文件中，我导出了组件以在另一个项目中使用npm包。首先，我已经在主根目录中运行了此代码。
npm run eject，然后是我的项目的下一部分
import React from 'react';
import './index.css';
import App from './App';
class ExportApp extends React.Component{
render(){
return(<App sayHi="hello There I am creating my first npm package"/>);
}
}
export default ExportApp;
{
"name": "create-react-app-npm",
"version": "0.1.0",
"main": "src/index.js",
"dependencies": {
"@babel/core": "7.5.5",
"@svgr/webpack": "4.3.2",
"@typescript-eslint/eslint-plugin": "1.13.0",
"@typescript-eslint/parser": "1.13.0",
"babel-eslint": "10.0.2",
"babel-jest": "^24.8.0",
"babel-loader": "8.0.6",
"babel-plugin-named-asset-import": "^0.3.3",
"babel-preset-react-app": "^9.0.1",
"camelcase": "^5.2.0",
"case-sensitive-paths-webpack-plugin": "2.2.0",
"css-loader": "2.1.1",
"dotenv": "6.2.0",
"dotenv-expand": "4.2.0",
"eslint": "^6.1.0",
"eslint-config-react-app": "^5.0.1",
"eslint-loader": "2.2.1",
"eslint-plugin-flowtype": "3.13.0",
"eslint-plugin-import": "2.18.2",
"eslint-plugin-jsx-a11y": "6.2.3",
"eslint-plugin-react": "7.14.3",
"eslint-plugin-react-hooks": "^1.6.1",
"file-loader": "3.0.1",
"fs-extra": "7.0.1",
"html-webpack-plugin": "4.0.0-beta.5",
"identity-obj-proxy": "3.0.0",
"is-wsl": "^1.1.0",
"jest": "24.8.0",
"jest-environment-jsdom-fourteen": "0.1.0",
"jest-resolve": "24.8.0",
"jest-watch-typeahead": "0.3.1",
"mini-css-extract-plugin": "0.5.0",
"optimize-css-assets-webpack-plugin": "5.0.3",
"pnp-webpack-plugin": "1.5.0",
"postcss-flexbugs-fixes": "4.1.0",
"postcss-loader": "3.0.0",
"postcss-normalize": "7.0.1",
"postcss-preset-env": "6.7.0",
"postcss-safe-parser": "4.0.1",
"react": "^16.9.0",
"react-app-polyfill": "^1.0.2",
"react-dev-utils": "^9.0.3",
"react-dom": "^16.9.0",
"resolve": "1.12.0",
"resolve-url-loader": "3.1.0",
"sass-loader": "7.2.0",
"semver": "6.3.0",
"style-loader": "1.0.0",
"terser-webpack-plugin": "1.4.1",
"ts-pnp": "1.1.2",
"url-loader": "2.1.0",
"webpack": "4.39.1",
"webpack-dev-server": "3.2.1",
"webpack-manifest-plugin": "2.0.4",
"workbox-webpack-plugin": "4.3.1"
},
"scripts": {
"start": "node scripts/start.js",
"build": "node scripts/build.js",
"test": "node scripts/test.js"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"jest": {
"roots": [
"<rootDir>/src"
],
"collectCoverageFrom": [
"src/**/*.{js,jsx,ts,tsx}",
"!src/**/*.d.ts"
],
"setupFiles": [
"react-app-polyfill/jsdom"
],
"setupFilesAfterEnv": [],
"testMatch": [
"<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}",
"<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}"
],
"testEnvironment": "jest-environment-jsdom-fourteen",
"transform": {
"^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/babel-jest",
"^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
"^(?!.*\\.(js|jsx|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
},
"transformIgnorePatterns": [
"[/\\\\]node_modules[/\\\\].+\\.(js|jsx|ts|tsx)$",
"^.+\\.module\\.(css|sass|scss)$"
],
"modulePaths": [],
"moduleNameMapper": {
"^react-native$": "react-native-web",
"^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy"
},
"moduleFileExtensions": [
"web.js",
"js",
"web.ts",
"ts",
"web.tsx",
"tsx",
"json",
"web.jsx",
"jsx",
"node"
],
"watchPlugins": [
"jest-watch-typeahead/filename",
"jest-watch-typeahead/testname"
]
},
"babel": {
"presets": [
"react-app"
]
},
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"babel-preset-stage-0": "^6.24.1"
}
}
我在项目的根文件夹中时，已经在终端中运行npm link。
创建此主项目后，我还使用npm_test代码创建了create-react-app npm_test项目文件夹。
我已运行npm link create-react-app-npm代码以链接先前的main project which is create-react-app-npm和第二个npm-test项目。
我的npm-test项目文件夹中的我的App.js文件如下。
import React from 'react';
import './App.css';
import ExportApp from 'create-react-app-npm'
function App2() {
return (
<div className="App">
<ExportApp/>
</div>
);
}
export default App2;
当我运行npm start时，我无法运行该项目。我收到了错误消息。我不知道这是什么意思。我该怎么办？
Failed to compile.
../create-react-app-npm/src/index.js
SyntaxError: /home/semih/Desktop/create-react-app-npm/src/index.js: Unexpected token (7:15)
5 | class ExportApp extends React.Component{
6 | render(){
> 7 | return(<App sayHi="hello There I am creating my first npm package"/>);
| ^
8 | }
9 | }
10 | export default ExportApp;
我期望在ExportMain项目中运行npm-test组件。我应该走什么路？
答案 0 :(得分：0)
创建React App / CRA并不是构建和捆绑npm软件包的最佳工具，它的main purpose是创建单页应用程序。对于组件库，CRA团队recommends使用more flexible toolchains。
弹出CRA后，您仍然可以尝试调整Webpack配置。这是一个示例配置，其中包含针对npm软件包的基本设置：
// simply way to exclude all node_modules from bundle.
// You can configure entries manually, too.
const nodeExternals = require('webpack-node-externals');
module.exports = {
...
output: {
// provide entry point exports via CommonJS / as npm package
libraryTarget: "commonjs"
},
...
// ignore built-in modules like path, fs, etc.
target: "node",
// don't bundle node_modules with your library
// external packages should be required
externals: [nodeExternals()]
};
关于CRA，请将这些设置添加到基本配置<root>/config/webpack.config.js中。可能的进一步调整：
output: {
// give your main npm package file a static name
// It should be stored to build/node_bundle.js
filename: "node_bundle.js"
},
package.json：
"main": "build/node_bundle.js"
最后，构建您的库并将其在客户端应用程序中使用。