SSR（Express）Angular 9 - Uncaught ReferenceError：$localize未定义。

Question

升级到Angular 9后，我遇到了错误：Uncaught ReferenceError: $localize未定义 错误：看起来您的应用程序或其某个依赖项正在使用i18n。 Angular 9引入了一个全局的$localize()函数，需要加载它。 请从Angular CLI运行ng add @angular/localize。 （对于非CLI项目，请将import '@angular/localize/init';添加到您的polyfills.ts文件中。 对于服务器端渲染应用程序，请将导入添加到您的main.server.ts文件中。）

我的应用程序是SSR（服务器端渲染），即使按照指导进行操作，我仍无法摆脱此消息。

• 我使用Express提供我的文件
• 我已经在polyfill.ts中放置了：import '@angular/localize/init';
• 我还运行了ng add @angular/localize
• 我只有一个server.js文件用于Express，并在其中也放置import '@angular/localize/init';。

这是我的angular.json文件：

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "tableng": {
      "i18n": {
        "sourceLocale": "en-US",
        "locales": {
          "fr": {
            "translation": "src/translate/messages.fr.xlf",
            "baseHref": "/fr/"
          }
        }
      },
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "app",
      "schematics": {},
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/tableng",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets",
              "src/web.config",
              "src/manifest.json"
            ],
            "styles": [
              "node_modules/jquery/dist/jquery.min.js",
              "node_modules/bootstrap/dist/css/bootstrap.min.css",
              "node_modules/font-awesome/css/font-awesome.css",
              "node_modules/@fullcalendar/core/main.css",
              "node_modules/@fullcalendar/resource-timeline/main.css",
              "node_modules/@fullcalendar/timegrid/main.css",
              "node_modules/@fullcalendar/timeline/main.css",
              "src/assets/sb-admin-2.min.css",
              "src/styles.css",
              "src/morestyles.scss"
            ],
            "scripts": [
              "node_modules/jquery/dist/jquery.min.js",
              "node_modules/jquery/dist/jquery.js",
              "node_modules/popper.js/dist/umd/popper.min.js",
              "node_modules/bootstrap/dist/js/bootstrap.min.js"

            ]
          },
          "configurations": {
            "fr": {
              "localize": ["fr"]
            },
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                }
              ],
              "serviceWorker": true,
              "ngswConfigPath": "src/ngsw-config.json"
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "tableng:build"
          },
          "configurations": {
            "fr": {
              "browserTarget": "tableng:build:fr"
            },
            "production": {
              "serve:dist": "http-server -p 8080 -c-1 dist/tableng",
              "browserTarget": "ng build --prod --localize --build-optimizer"
            }
          }
        }
      }
    }

  }}

我的 server.js 文件：

'use strict';
const bodyParser = require('body-parser');
const $localize = require('@angular/localize');

var express = require('express');
var app = express();
var directory = '/' + (process.env.STATIC_DIR)

app.use(express.static(__dirname + directory));
app.use('/fr',function(req, res) {
   res.sendFile(__dirname + '/dist/tableng/fr/index.html');

}); 

app.use('/',function(req, res) {
  res.sendFile(__dirname + '/dist/tableng/en-US/index.html'); 
}); 

app.use(express.json());       // to support JSON-encoded bodies
app.use(express.urlencoded({ extended: true})); // to support URL-encoded bodies

var port = process.env.PORT || 3000;
app.listen(port, function () {
  console.log('express - Listening on', port);

});

谢谢任何输入！！

- Satyam Dorville

Answer 1

Angular 9引入了一个需要加载的全局$localize()函数。

请从Angular CLI中运行ng add @angular/localize命令安装。

(对于非CLI项目，请将import '@angular/localize/init';添加到您的polyfills.ts文件中)

了解更多信息，请访问：https://angular.io/guide/migration-localize

- rtvalluri

Answer 2

我放置了这个：

import '../node_modules/@angular/localize/init';

在 polyfill 中，替换的是这个：

import '@angular/localize/init';

没问题！

- Satyam Dorville

---

这可能意味着你的 package.json 文件中缺少了它。 - bvdb