我已经写了一组我希望发布的 React 组件。但是，当我尝试在发布之前使用 babel 将它们构建为 commonjs 格式时，我收到以下错误，我找不到解决方案。
创建项目并从create-react-app中弹出
SyntaxError: src/packages/core/src/MyAppBar/MyAppBar.js: Unexpected token, expected ; (20:5)
18 | import {isEmpty} from "lodash";
19 |
> 20 | type MyAppBarPropsType = {
| ^
21 | position?: string,
22 | commandBarActions?: Array<React$Element<React$ElementType>>,
23 | title?: string,
我的 npm 脚本中的构建行是
"build:commonjs": "cross-env NODE_ENV=production babel ./src/packages/core/src --out-dir ./lib --ignore spec.js"
我本以为@babel/preset-flow足以处理代码中的流类型。
我的babel.config.js文件中的预设如下
presets: ['@babel/preset-flow', '@babel/preset-react', ['@babel/preset-env', {modules: 'commonjs'}]],
为了完整起见，我的完整package.json和babel.config.js如下
包.json
{
"name": "react-ccl",
"version": "0.2.0-alpha",
"description": "Common component library based on xyz look and feel guidelines",
"private": true,
"dependencies": {
"@babel/core": "7.6.0",
"@material-ui/core": "3.9.2",
"@material-ui/icons": "3.0.2",
"@material-ui/lab": "3.0.0-alpha.30",
"@material-ui/styles": "3.0.0-alpha.10",
"@svgr/webpack": "4.3.2",
"@typescript-eslint/eslint-plugin": "^2.2.0",
"@typescript-eslint/parser": "^2.2.0",
"babel-eslint": "10.0.3",
"babel-jest": "^24.9.0",
"babel-loader": "8.0.6",
"babel-plugin-named-asset-import": "^0.3.4",
"babel-preset-react-app": "^9.0.2",
"camelcase": "^5.2.0",
"case-sensitive-paths-webpack-plugin": "2.2.0",
"css-loader": "2.1.1",
"dotenv": "6.2.0",
"dotenv-expand": "5.1.0",
"eslint": "^6.6.0",
"eslint-config-react-app": "^5.0.2",
"eslint-loader": "3.0.0",
"eslint-plugin-flowtype": "3.13.0",
"eslint-plugin-import": "2.18.2",
"eslint-plugin-jsx-a11y": "6.2.3",
"eslint-plugin-react": "7.16.0",
"eslint-plugin-react-hooks": "^1.6.1",
"file-loader": "3.0.1",
"fs-extra": "7.0.1",
"highlight": "^0.2.4",
"highlight.js": "^9.10.0",
"html-webpack-plugin": "4.0.0-beta.5",
"identity-obj-proxy": "3.0.0",
"is-wsl": "^1.1.0",
"lodash": "^4.17.15",
"mini-css-extract-plugin": "0.8.0",
"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": "^16.10.0",
"react-addons-test-utils": "15.5.1",
"react-app-polyfill": "^1.0.3",
"react-dev-utils": "^9.0.4",
"react-dom": "^16.10.0",
"react-test-renderer": "16.10.0",
"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": "1.1.4",
"url-loader": "2.1.0",
"webpack": "4.40.2",
"webpack-dev-server": "3.2.1",
"webpack-manifest-plugin": "2.0.4",
"workbox-webpack-plugin": "4.3.1"
},
"devDependencies": {
"@babel/cli": "7.7.7",
"@babel/node": "7.7.7",
"@babel/plugin-proposal-class-properties": "7.2.1",
"@babel/plugin-syntax-dynamic-import": "7.2.0",
"@babel/plugin-transform-object-assign": "7.2.0",
"@babel/plugin-transform-react-constant-elements": "7.6.0",
"@babel/plugin-transform-runtime": "7.6.2",
"@babel/preset-env": "7.7.7",
"@babel/preset-flow": "7.7.4",
"@babel/preset-react": "7.7.4",
"@babel/register": "7.0.0",
"babel-cli": "^6.26.0",
"chokidar": "1.6.1",
"cpx": "^1.5.0",
"cross-env": "^6.0.3",
"enzyme": "^3.10.0",
"enzyme-adapter-react-16": "^1.15.1",
"enzyme-to-json": "^3.4.3",
"flow-bin": "0.113.0",
"flow-typed": "^2.6.2",
"jest": "24.9.0",
"jest-environment-jsdom-fourteen": "1.0.1",
"jest-resolve": "24.9.0",
"jest-watch-typeahead": "0.4.0",
"lerna": "3.16.4",
"npm-run-all": "4.0.2",
"prop-types": "15.7.2",
"rimraf": "3.0.0",
"react-docgen": "3.0.0"
},
"scripts": {
"prestart": "npm run gen:docs",
"start": "npm-run-all --parallel start:docs gen:docs-watch",
"start:docs": "node scripts/start.js",
"gen:docs": "node scripts/generateComponentData.js",
"gen:docs-watch": "npm run gen:docs -- --watch",
"build:docs": "node scripts/build.js",
"test": "node scripts/test.js",
"predeploy:docs": "npm run build:docs",
"deploy:docs": "gh-pages -d build",
"flow": "flow",
"build:commonjs": "cross-env NODE_ENV=production babel ./src/packages/core/src --out-dir ./lib --ignore spec.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/packages/core"
],
"collectCoverageFrom": [
"src/**/*.{js,jsx,ts,tsx}",
"!src/**/*.d.ts"
],
"setupFiles": [
"react-app-polyfill/jsdom"
],
"setupFilesAfterEnv": [
"<rootDir>/jest-test-setup.js"
],
"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.config.js
const productionPlugins = [
'@babel/plugin-transform-react-constant-elements',
['babel-plugin-react-remove-properties', { properties: ['data-mui-test'] }],
[
'babel-plugin-transform-react-remove-prop-types',
{
mode: 'unsafe-wrap',
},
],
];
module.exports = {
presets: ['@babel/preset-flow', '@babel/preset-react', ['@babel/preset-env', {modules: 'commonjs'}]],
plugins: [
['@babel/plugin-proposal-class-properties', { loose: true }],
['@babel/plugin-proposal-object-rest-spread', { loose: true }],
'@babel/plugin-transform-runtime',
// for IE 11 support
'@babel/plugin-transform-object-assign',
],
ignore: [/@babel[\|/]runtime/], // Fix a Windows issue.
env: {
cjs: {
plugins: productionPlugins,
},
},
};
显然preset-flow不足以让 babel 转译 JS 文件中定义的流类型。当我在package.json中添加以下行以devDependencies时，构建运行良好。
"babel-plugin-react-remove-properties": "^0.3.0",