尝试运行Angular 8应用程序时出现“未捕获的错误：预期'样式'为字符串数组”
我有一个Angular 8应用程序，该应用程序托管在.net Core 2.2 MVC应用程序中。它使用的是与Webpack 4捆绑在一起的项目模板。当我尝试在Visual Studio 2019中运行它时，它无法加载并出现以下错误：
"Uncaught Error: Expected 'styles' to be an array of strings.
at assertArrayOfStrings (vendor.js:34916)
at CompileMetadataResolver.getNonNormalizedDirectiveMetadata
(vendor.js:50233)
at CompileMetadataResolver._getEntryComponentMetadata (vendor.js:50878)
at vendor.js:50869
at Array.forEach (<anonymous>)
at CompileMetadataResolver._getEntryComponentsFromProvider
(vendor.js:50868)
at vendor.js:50841
at Array.forEach (<anonymous>)
at CompileMetadataResolver._getProvidersMetadata (vendor.js:50804)
at vendor.js:50806"
一直有效，直到我进行了两次更改。
- 我将css-loader软件包从0.28.11升级到了2.1.1。这需要更改我的webpack.config.js文件才能使其正常工作。
- 我从7.2.14升级到Angular 8。这需要将Typescript升级到3.4。
我尝试了所有可能在Google上找到的潜在修复程序，但仍然收到此错误。我的想法不多了。请帮忙。
我的webpack.config.js
const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const AngularCompilerPlugin = require('@ngtools/webpack').AngularCompilerPlugin;
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;
const CopyWebpackPlugin = require('copy-webpack-plugin');
const nodeExternals = require('webpack-node-externals');
const TerserPlugin = require('terser-webpack-plugin');
const CircularDependencyPlugin = require('circular-dependency-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
module.exports = (env) => {
// Configuration for client-side bundle suitable for running in browsers
const clientBundleOutputDir = './wwwroot/dist';
// Configuration in common to both client-side and server-side bundles
const isDevBuild = !(env && env.prod);
const sharedConfig = {
mode: 'production',
stats: { modules: false },
context: __dirname,
resolve: { extensions: ['.js', '.ts'] },
output: {
filename: '[name].js',
publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
},
module: {
rules: [
{ test: /\.ts$/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader', 'angular-router-loader'] : '@ngtools/webpack' },
{
test: /\.html$/,
use: [{
loader: 'html-loader',
options: {
minimize: false
}
}]
},
{
test: /\.css(\?|$)/,
use: [
// fallback to style-loader in development
isDevBuild ? 'style-loader' : {
loader: MiniCssExtractPlugin.loader,
options: {
}
},
"css-loader",
"sass-loader"
]
},
{
test: /\.scss$/,
use: [
'style-loader', // creates style nodes from JS strings
'css-loader', // translates CSS into CommonJS
'sass-loader' // compiles Sass to CSS
]
},
{
test: /\.(png|gif|jpg|jpeg|woff|woff2|eot|ttf|svg)$/i,
use: [
{
loader: 'url-loader',
options: {
limit: 25000
}
}
]
}
]
},
plugins: [
new MiniCssExtractPlugin({
// Options similar to the same options in webpackOptions.output
// both options are optional
filename: "[name].css",
chunkFilename: "[id].css"
}),
new CheckerPlugin(),
new CopyWebpackPlugin([
{ from: 'ClientApp/assets', to: 'assets' }
]),
new CircularDependencyPlugin({
// `onStart` is called before the cycle detection starts
onStart({ compilation }) {
console.log('start detecting webpack modules cycles');
},
// `onDetected` is called for each module that is cyclical
onDetected({ module: webpackModuleRecord, paths, compilation }) {
// `paths` will be an Array of the relative module paths that make up the cycle
// `module` will be the module record generated by webpack that caused the cycle
compilation.errors.push(new Error(paths.join(' -> ')));
},
// `onEnd` is called before the cycle detection ends
onEnd({ compilation }) {
console.log('end detecting webpack modules cycles');
}
})
]
};
const clientBundleConfig = merge(sharedConfig, {
entry: { 'main-client': './ClientApp/boot.browser.ts' },
output: { path: path.join(__dirname, clientBundleOutputDir) },
plugins: [
new webpack.DllReferencePlugin({
context: __dirname,
manifest: require('./wwwroot/dist/vendor-manifest.json')
}),
new webpack.ProvidePlugin({
$: "jquery",
jQuery: "jquery"
})
].concat(isDevBuild ? [
// Plugins that apply in development builds only
new webpack.SourceMapDevToolPlugin({
filename: '[file].map', // Remove this line if you prefer inline source maps
moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
})
] : [
// Plugins that apply in production builds only
new AngularCompilerPlugin({
tsConfigPath: './tsconfig.json',
entryModule: path.join(__dirname, 'ClientApp/app/app.browser.module#AppModule'),
exclude: ['./**/*.server.ts']
})
]),
optimization: {
//splitChunks: {},
minimizer: [].concat(isDevBuild ? [] : [
new TerserPlugin({
cache: true,
parallel: true,
terserOptions: {
compress: true,
ecma: 6,
mangle: {
toplevel: true, properties: false
},
toplevel: true,
keep_classnames: false,
keep_fnames: false
},
sourceMap: false
})
])
}
});
// Configuration for server-side (prerendering) bundle suitable for running in Node
const serverBundleConfig = merge(sharedConfig, {
resolve: { mainFields: ['main'] },
entry: { 'main-server': './ClientApp/boot.server.ts' },
plugins: [
new webpack.DllReferencePlugin({
context: __dirname,
manifest: require('./ClientApp/dist/vendor-manifest.json'),
sourceType: 'commonjs2',
name: './vendor'
}),
new webpack.ProvidePlugin({
$: "jquery",
jQuery: "jquery"
})
].concat(isDevBuild ? [] : [
// Plugins that apply in production builds only
new AngularCompilerPlugin({
tsConfigPath: './tsconfig.json',
entryModule: path.join(__dirname, 'ClientApp/app/app.server.module#AppModule'),
exclude: ['./**/*.browser.ts']
})
]),
output: {
libraryTarget: 'commonjs',
path: path.join(__dirname, 'ClientApp/dist')
},
target: 'node',
externals: [nodeExternals()],
devtool: isDevBuild ? 'inline-source-map' : '(none)',
optimization: {
//splitChunks: {},
minimizer: [].concat(isDevBuild ? [] : [
new TerserPlugin({
cache: true,
parallel: true,
terserOptions: {
compress: true,
ecma: 6,
mangle: {
toplevel: true, properties: false
},
toplevel: true,
keep_classnames: false,
keep_fnames: false
},
sourceMap: false
})
])
}
});
return [clientBundleConfig, serverBundleConfig];
};
我的webpack.config.vendor.js
const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const TerserPlugin = require('terser-webpack-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const treeShakableModules = [
'@angular/animations',
'@angular/common',
'@angular/compiler',
'@angular/core',
'@angular/forms',
'@angular/platform-browser',
'@angular/platform-browser-dynamic',
'@angular/router',
'zone.js'
];
const nonTreeShakableModules = [
'bootstrap',
'bootstrap/dist/css/bootstrap.css',
'@ng-select/ng-select/themes/default.theme.css',
'primeicons/primeicons.css',
'primeng/resources/themes/nova-light/theme.css',
'primeng/resources/primeng.css',
'es6-promise',
'es6-shim',
'event-source-polyfill',
'jquery'
];
const allModules = treeShakableModules.concat(nonTreeShakableModules);
module.exports = (env) => {
const isDevBuild = !(env && env.prod);
const sharedConfig = {
mode: 'production',
stats: { modules: false },
resolve: { extensions: ['.js'] },
module: {
rules: [
{
test: /\.(png|gif|jpg|jpeg|woff|woff2|eot|ttf|svg)$/i,
use: [
{
loader: 'url-loader',
options: {
limit: 100000
}
}
]
}
]
},
output: {
publicPath: 'dist/',
filename: '[name].js',
library: '[name]_[hash]'
},
plugins: [
new webpack.ProvidePlugin({ $: 'jquery', jQuery: 'jquery' })
]
};
const clientBundleConfig = merge(sharedConfig, {
entry: {
// To keep development builds fast, include all vendor dependencies in the vendor bundle.
// But for production builds, leave the tree-shakable ones out so the AOT compiler can produce a smaller bundle.
vendor: isDevBuild ? allModules : nonTreeShakableModules
},
output: { path: path.join(__dirname, 'wwwroot', 'dist') },
module: {
rules: [
{
test: /\.css(\?|$)/,
use: [
// fallback to style-loader in development
isDevBuild ? 'style-loader' : {
loader: MiniCssExtractPlugin.loader,
options: {
}
},
"css-loader",
"sass-loader"
]
},
{
test: /\.scss$/,
use: [
'style-loader', // creates style nodes from JS strings
'css-loader', // translates CSS into CommonJS
'sass-loader' // compiles Sass to CSS
]
}
]
},
plugins: [
new MiniCssExtractPlugin({
// Options similar to the same options in webpackOptions.output
// both options are optional
filename: "[name].css",
chunkFilename: "[id].css"
}),
new webpack.DllPlugin({
path: path.join(__dirname, 'wwwroot', 'dist', '[name]-manifest.json'),
name: '[name]_[hash]'
})
].concat(isDevBuild ? [] : [
]),
optimization: {
// splitChunks: {},
minimizer: [].concat(isDevBuild ? [] : [
new TerserPlugin({
cache: true,
parallel: true,
terserOptions: {
compress: false,
ecma: 6,
mangle: false,
toplevel: false,
keep_classnames: true,
keep_fnames: true
},
sourceMap: true
})
])
}
});
const serverBundleConfig = merge(sharedConfig, {
target: 'node',
resolve: { mainFields: ['main'] },
entry: { vendor: allModules.concat(['aspnet-prerendering']) },
output: {
path: path.join(__dirname, 'ClientApp', 'dist'),
libraryTarget: 'commonjs2'
},
module: {
rules: [
{
test: /\.css(\?|$)/,
use: [
// fallback to style-loader in development
isDevBuild ? 'style-loader' : {
loader: MiniCssExtractPlugin.loader,
options: {
}
},
"css-loader",
"sass-loader"
]
},
{
test: /\.scss$/,
use: [
'style-loader', // creates style nodes from JS strings
'css-loader', // translates CSS into CommonJS
'sass-loader' // compiles Sass to CSS
]
}
]
},
plugins: [
new MiniCssExtractPlugin({
// Options similar to the same options in webpackOptions.output
// both options are optional
filename: "[name].css",
chunkFilename: "[id].css"
}),
new webpack.DllPlugin({
path: path.join(__dirname, 'ClientApp', 'dist', '[name]-manifest.json'),
name: '[name]_[hash]'
})
],
optimization: {
//splitChunks: {},
minimizer: [].concat(isDevBuild ? [] : [
new TerserPlugin({
cache: true,
parallel: true,
terserOptions: {
compress: false,
ecma: 6,
mangle: false,
toplevel: false,
keep_classnames: true,
keep_fnames: true
},
sourceMap: true
})
])
}
});
return [clientBundleConfig, serverBundleConfig];
};
我的package.json
{
"name": "myapp",
"private": true,
"version": "0.0.0",
"scripts": {
"test": "karma start ClientApp/test/karma.conf.js",
"postinstall": "webpack --config webpack.config.vendor.js"
},
"postcss": {},
"dependencies": {
"@angular/animations": "8.0.0",
"@angular/cdk": "8.0.0",
"@angular/common": "8.0.0",
"@angular/compiler": "8.0.0",
"@angular/core": "8.0.0",
"@angular/forms": "8.0.0",
"@angular/material": "8.0.0",
"@angular/platform-browser": "8.0.0",
"@angular/platform-browser-dynamic": "8.0.0",
"@angular/platform-server": "8.0.0",
"@angular/router": "8.0.0",
"@fortawesome/angular-fontawesome": "0.4.0",
"@fortawesome/fontawesome-svg-core": "1.2.20-2",
"@fortawesome/free-solid-svg-icons": "5.10.0-2",
"@ng-bootstrap/ng-bootstrap": "4.2.1",
"@ng-select/ng-select": "2.20.0",
"angular-dual-listbox": "4.7.0",
"angular2-notifications": "2.0.0",
"core-js": "3.1.3",
"hammer-timejs": "1.1.0",
"hammerjs": "2.0.8",
"jwt-decode": "^2.2.0",
"material-design-icons": "3.0.1",
"primeicons": "1.0.0",
"primeng": "7.1.3",
"rxjs": "6.5.2",
"zone.js": "0.9.1"
},
"devDependencies": {
"@angular/compiler-cli": "8.0.0",
"@intervolga/optimize-cssnano-plugin": "1.0.6",
"@ngtools/webpack": "8.0.2",
"@types/chai": "4.1.7",
"@types/jasmine": "3.3.13",
"@types/jwt-decode": "2.2.1",
"@types/webpack-env": "1.13.9",
"angular-router-loader": "0.8.5",
"angular2-template-loader": "0.6.2",
"aspnet-prerendering": "3.0.1",
"aspnet-webpack": "3.0.0",
"autoprefixer": "^9.6.0",
"awesome-typescript-loader": "5.2.1",
"bootstrap": "4.3.1",
"chai": "4.2.0",
"circular-dependency-plugin": "5.0.2",
"clean-webpack-plugin": "3.0.0",
"copy-webpack-plugin": "5.0.3",
"css": "2.2.4",
"css-loader": "2.1.1",
"es6-promise": "4.2.6",
"es6-shim": "0.35.5",
"event-source-polyfill": "1.0.5",
"expose-loader": "0.7.5",
"extract-text-webpack-plugin": "4.0.0-beta.0",
"file-loader": "4.0.0",
"html-loader": "0.5.5",
"html-webpack-plugin": "^3.2.0",
"isomorphic-fetch": "2.2.1",
"jasmine-core": "3.3.0",
"jquery": "3.4.1",
"json-loader": "0.5.7",
"karma": "4.1.0",
"karma-chai": "0.1.0",
"karma-chrome-launcher": "2.2.0",
"karma-cli": "2.0.0",
"karma-jasmine": "2.0.1",
"karma-webpack": "3.0.5",
"mini-css-extract-plugin": "0.7.0",
"node-sass": "4.12.0",
"popper.js": "1.15.0",
"postcss-load-config": "^2.0.0",
"postcss-loader": "^3.0.0",
"preboot": "7.0.0",
"raw-loader": "3.0.0",
"reflect-metadata": "0.1.13",
"sass-loader": "7.1.0",
"style-loader": "0.23.1",
"terser-webpack-plugin": "1.3.0",
"to-string-loader": "1.1.5",
"typescript": "3.4.5",
"uglifyjs-webpack-plugin": "2.1.3",
"url-loader": "2.0.0",
"webpack": "4.33.0",
"webpack-bundle-analyzer": "3.3.2",
"webpack-cli": "3.3.3",
"webpack-hot-middleware": "2.25.0",
"webpack-merge": "4.2.1"
}
}
2 个答案:
答案 0 :(得分：0)
默认情况下，Visual Studio 2019默认已经具有用于这样的角度的SPA模板
所以我建议您删除所有webpack，因为我记得那些webpack.config文件用于angular5。现在模板使用angular cli
欢呼
答案 1 :(得分：0)
我让它工作了，但是我不确定为什么。为了使其正常工作，我通过不使用mini-css-extract-plugin并从使用样式加载器切换为字符串加载器来更改了webpack.config.js。因此，该文件的css规则部分如下所示：
{
test: /\.css(\?|$)/,
use: [
'to-string-loader',
'css-loader'
]
}
如果有人能告诉我它为什么起作用，我将非常感谢。我希望这可以帮助其他人。
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