我正在尝试从1迁移到Webpack 2并且收到了很多错误。我设法摆脱了一些错误，但仍然收到以下内容：
$ node scripts / start.js （node：42015）UnhandledPromiseRejectionWarning：未处理的promise promise（拒绝ID：1）：WebpackOptionsValidationError：无效的配置对象。 Webpack已使用与API架构不匹配的配置对象进行初始化。
弃用警告：不推荐使用未处理的拒绝承诺。将来，未处理的承诺拒绝将使用非零退出代码终止Node.js进程。
我的webpack配置位于
之下var autoprefixer = require('autoprefixer');
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var ManifestPlugin = require('webpack-manifest-plugin');
var InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
var url = require('url');
var paths = require('./paths');
var getClientEnvironment = require('./env');
function ensureSlash(path, needsSlash) {
var hasSlash = path.endsWith('/');
if (hasSlash && !needsSlash) {
return path.substr(path, path.length - 1);
} else if (!hasSlash && needsSlash) {
return path + '/';
} else {
return path;
}
}
// like /todos/42/static/js/bundle.7289d.js. We have to know the root.
var homepagePath = require(paths.appPackageJson).homepage;
var homepagePathname = homepagePath ? url.parse(homepagePath).pathname :
%PUBLIC_PATH%xyz.
var publicUrl = ensureSlash(homepagePathname, false);
var env = getClientEnvironment(publicUrl);
// Assert this just to be safe.
// Development builds of React are slow and not intended for production.
if (env['process.env'].NODE_ENV !== '"production"') {
throw new Error('Production builds must have NODE_ENV=production.');
}
module.exports = {
bail: true,
entry: [
require.resolve('./polyfills'),
paths.appIndexJs
],
output: {
// The build folder.
path: paths.appBuild,
// Generated JS file names (with nested folders).
// There will be one main bundle, and one file per asynchronous chunk.
// We don't currently advertise code splitting but Webpack supports it.
filename: 'assets/static/js/[name].js',
chunkFilename: 'assets/static/js/[name].chunk.js',
// We inferred the "public path" (such as / or /my-project) from homepage.
publicPath: publicPath
},
resolve: {
extensions: ['.js', '.json', '.jsx'],
alias: {
// Support React Native Web
// https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
'react-native': 'react-native-web'
}
},
module: {
rules: [
{
test: /\.(js|jsx)$/,
loader: 'eslint',
include: paths.appSrc,
enforce: 'pre'
},
{
exclude: [
/\.html$/,
/\.(js|jsx)$/,
/\.css$/,
/\.json$/,
/\.svg$/
],
loader: 'url',
options: {
limit: 10000,
name: 'static/media/[name].[hash:8].[ext]'
}
},
// Process JS with Babel.
{
test: /\.(js|jsx)$/,
include: paths.appSrc,
loader: 'babel',
},
{
test: /\.css$/,
loader: ExtractTextPlugin.extract('style', 'css?importLoaders=1!postcss')
// Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
},
// JSON is not enabled by default in Webpack but both Node and Browserify
// allow it implicitly so we also enable it.
{
test: /\.json$/,
loader: 'json'
},
// "file" loader for svg
{
test: /\.svg$/,
loader: 'file',
options: {
name: 'static/media/[name].[hash:8].[ext]'
}
}
]
},
plugins: [
// Makes the public URL available as %PUBLIC_URL% in index.html, e.g.:
// <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
// In production, it will be an empty string unless you specify "homepage"
// in `package.json`, in which case it will be the pathname of that URL.
new InterpolateHtmlPlugin({
PUBLIC_URL: publicUrl
}),
// Generates an `index.html` file with the <script> injected.
new HtmlWebpackPlugin({
inject: true,
template: paths.appHtml,
minify: {
removeComments: true,
collapseWhitespace: true,
removeRedundantAttributes: true,
useShortDoctype: true,
removeEmptyAttributes: true,
removeStyleLinkTypeAttributes: true,
keepClosingSlash: true,
minifyJS: true,
minifyCSS: true,
minifyURLs: true
}
}),
// Makes some environment variables available to the JS code, for example:
// if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
// It is absolutely essential that NODE_ENV was set to production here.
// Otherwise React will be compiled in the very slow development mode.
new webpack.DefinePlugin(env),
// This helps ensure the builds are consistent if source hasn't changed:
new webpack.optimize.OccurrenceOrderPlugin(),
// Try to dedupe duplicated modules, if any:
new webpack.optimize.DedupePlugin(),
// Minify the code.
new webpack.optimize.UglifyJsPlugin({
compress: {
screw_ie8: true, // React doesn't support IE8
warnings: false
},
mangle: {
screw_ie8: true
},
output: {
comments: false,
screw_ie8: true
}
}),
// Note: this won't work without ExtractTextPlugin.extract(..) in `loaders`.
new ExtractTextPlugin('assets/static/css/[name].css'),
// Generate a manifest file which contains a mapping of all asset filenames
// to their corresponding output file so that tools can pick it up without
// having to parse `index.html`.
new ManifestPlugin({
fileName: 'asset-manifest.json'
})
],
// Some libraries import Node modules but don't use them in the browser.
// Tell Webpack to provide empty mocks for them so importing them works.
node: {
fs: 'empty',
net: 'empty',
tls: 'empty'
}
};
我的start.js在这里https://pastebin.com/ENRYKUgL
非常感谢任何帮助。
答案 0 :(得分：1)
fallback是ExtractTextPlugin的一个选项，可能尝试使用新的use: { //.. }表示法而不是查询字符串表示法进行定义。这可能不完美，但应该让你开始...
{
test: /\.css$/,
loader: ExtractTextPlugin.extract({
fallback: 'style-loader',
use: [
{ loader: 'css-loader', options: {importLoaders: 1}},
{ loader: 'postcss-loader' }
]
})
}
在旁注中，您不应该在Webpack 2中需要OccurrenceOrderPlugin或DedupePlugin，因为它们默认包含在内