这里有同样的错误，查看我找到本指南的 angularfire 文档：
https://github.com/angular/angularfire2/blob/master/docs/universal/getting-started.md
它无法正常工作，所以我找到了一个解决方案，将构建过程更改为：
webpack.server.config.js
const path = require('path');
const webpack = require('webpack');
const APP_NAME = 'YOUR APP NAME HERE'; // CHANGE ME
module.exports = {
entry: { server: './server.ts' },
resolve: { extensions: ['.js', '.ts'] },
mode: 'development',
target: 'node',
externals: [
/* Firebase has some troubles being webpacked when in
in the Node environment, let's skip it.
Note: you may need to exclude other dependencies depending
on your project. */
/^firebase/
],
output: {
// Export a UMD of the webpacked server.ts & deps, for
// rendering in Cloud Functions
path: path.join(__dirname, `dist/${APP_NAME}`),
library: 'app',
libraryTarget: 'umd',
filename: '[name].js'
},
module: {
rules: [
{ test: /\.ts$/, loader: 'ts-loader' }
]
},
plugins: [
new webpack.ContextReplacementPlugin(
/(.+)?angular(\\|\/)core(.+)?/,
path.join(__dirname, 'src'), // location of your src
{} // a map of your routes
),
new webpack.ContextReplacementPlugin(
/(.+)?express(\\|\/)(.+)?/,
path.join(__dirname, 'src'),
{}
)
]
}
server.ts
/**
* *** NOTE ON IMPORTING FROM ANGULAR AND NGUNIVERSAL IN THIS FILE ***
*
* If your application uses third-party dependencies, you'll need to
* either use Webpack or the Angular CLI's `bundleDependencies` feature
* in order to adequately package them for use on the server without a
* node_modules directory.
*
* However, due to the nature of the CLI's `bundleDependencies`, importing
* Angular in this file will create a different instance of Angular than
* the version in the compiled application code. This leads to unavoidable
* conflicts. Therefore, please do not explicitly import from @angular or
* @nguniversal in this file. You can export any needed resources
* from your application's main.server.ts file, as seen below with the
* import for `ngExpressEngine`.
*/
import 'zone.js/dist/zone-node';
import 'reflect-metadata';
import { enableProdMode } from '@angular/core';
import * as express from 'express';
import {join} from 'path';
import { readFileSync } from 'fs';
// Polyfills required for Firebase
(global as any).WebSocket = require('ws');
(global as any).XMLHttpRequest = require('xhr2');
enableProdMode();
// Express server
const app = express();
const PORT = process.env.PORT || 4000;
const DIST_FOLDER = join(process.cwd(), 'dist');
const APP_NAME = 'YOUR APP NAME HERE'; // CHANGE ME
// * NOTE :: leave this as require() since this file is built Dynamically from webpack
const {AppServerModuleNgFactory, LAZY_MODULE_MAP, ngExpressEngine, provideModuleMap} = require(`./dist/server/main`);
//index.html template
const template = readFileSync(join(DIST_FOLDER, 'browser', 'index.html')).toString();
// Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
app.engine('html', ngExpressEngine({
bootstrap: AppServerModuleNgFactory,
providers: [
provideModuleMap(LAZY_MODULE_MAP)
]
}));
app.set('view engine', 'html');
app.set('views', join(DIST_FOLDER, 'browser'));
// Example Express Rest API endpoints
// app.get('/api/**', (req, res) => { });
// Serve static files from /browser
app.get('*.*', express.static(join(DIST_FOLDER, 'browser'), {
maxAge: '1y'
}));
// All regular routes use the Universal engine
app.get('*', (req, res) => {
res.render(join(DIST_FOLDER, 'browser', 'index.html'), { req });
});
// If we're not in the Cloud Functions environment, spin up a Node server
if (!process.env.FUNCTION_NAME) {
app.listen(PORT, () => {
console.log(`Node server listening on http://localhost:${PORT}`);
});
}
package.json
"build": "ng build && npm run build:ssr",
"build:ssr": "ng run cuervo-app:server && npm run webpack:ssr",
"webpack:ssr": "webpack --config webpack.server.config.js",
"serve:ssr": "node dist/cuervo-app/server.js"
小心你应用的引用变量！
希望对你也有帮助！很难找到这个解决方案，我不知道它是否是最好的，但是官方文档没有用。
再见！