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[英]Angular compilation fails after upgrade to Angular v9 and enabling Ivy
[英]After updating Angular from v8 to v9 and enabling ivy to true, component is not loading at beginning
当应用程序启动时,我在加载组件时遇到问题。 它不是延迟加载的(正如您从应用程序路由文件中看到的那样),从 v8 更新到 v9 没问题。 它在 v8 上运行良好,但在更新到 v9 并启用 ivy 为 true 后,路由不起作用。 如果 ivy 设置为 false,即使在 v9 中,它也会再次工作! 这很奇怪。
基本上,当用户输入 ''.com 时,它会重定向到 /questions 或用户输入 /questions.com,当 ivy 为 false 时它正在工作。
以下是有关版本的一些信息:
"@angular/animations": "~9.0.7",
"@angular/common": "~9.0.7",
"@angular/compiler": "~9.0.7",
"@angular/core": "~9.0.7",
"@angular/forms": "~9.0.7",
"@angular/platform-browser": "~9.0.7",
"@angular/platform-browser-dynamic": "~9.0.7",
"@angular/platform-server": "~9.0.7",
"@angular/router": "~9.0.7",
"@nguniversal/express-engine": "^8.2.6",
"@nguniversal/module-map-ngfactory-loader": "8.1.1",
"bootstrap": "^4.4.1",
"chart.js": "^2.9.3",
"core-js": "^2.6.11",
"express": "^4.15.2",
"ng2-charts": "^2.3.0",
"rxjs": "~6.5.4",
"tslib": "^1.10.0",
"zone.js": "~0.10.2"
}
这是我的配置文件:
{
"compileOnSave": false,
"compilerOptions": {
"baseUrl": "./",
"outDir": "./dist/out-tsc",
"sourceMap": true,
"declaration": false,
"module": "esnext",
"moduleResolution": "node",
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"importHelpers": true,
"target": "es2015",
"resolveJsonModule": true,
"allowSyntheticDefaultImports": true,
"esModuleInterop": true,
"typeRoots": [
"node_modules/@types"
],
"lib": [
"es2018",
"dom"
]
},
"angularCompilerOptions": {
"enableIvy": false,
"fullTemplateTypeCheck": false,
"strictTemplates": false
}
}
我的应用程序路由文件:
import { RouterModule, Routes } from '@angular/router';
import { HomeComponent } from './core/home/home.component';
import { NgModule } from '@angular/core';
const routes: Routes = [
{ path: 'info', component: HomeComponent },
{ path: '', redirectTo: '/questions', pathMatch: 'full'},
{ path: 'users', loadChildren: () => import('./users/users.module').then(m => m.UsersModule) },
{ path: 'about', loadChildren: () => import('./aboutus/aboutus.module').then(m => m.AboutUsModule) },
{ path: 'Frequently-Asked-Questions', loadChildren: () => import('./faq/faq.module').then(m => m.FaqModule) },
{ path: 'legal', loadChildren: () => import('./legal/legal.module').then(m => m.LegalModule) },
{ path: 'help', loadChildren: () => import('./help/help.module').then(m => m.HelpModule) },
{ path: 'categories', loadChildren: () => import('./categories/categories.module').then(m => m.CategoriesModule) },
];
@NgModule({
imports: [RouterModule.forRoot(routes, { scrollPositionRestoration: 'enabled' })
],
exports: [RouterModule]
})
export class AppRoutingModule { }
我的应用模块:
import { BrowserModule } from '@angular/platform-browser';
import { NgModule, ErrorHandler } from '@angular/core';
import { HttpClientModule } from '@angular/common/http'
import { AppComponent } from './app.component';
import { CoreModule } from './core/core.module';
import { AuthErrorHandler } from './auth/autherrorhandler.service';
import { LoaderModule } from './core/loader/loader.module';
import { UrlSerializer } from '@angular/router';
import CustomUrlSerializer from './shared/CustomEncoder.service';
import { SeoSocialSharedService } from './shared/SeoSocialSharedService';
import { ServerErrorModule } from './core/server-error/server-error.module';
import { AuthModule } from './auth/auth.module';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { GoogleAnalyticsEventsService } from './shared/googleAnalyticsEventsService.service';
import { QuestionsModule } from './questions/questions.module';
const customUrlSerializer = new CustomUrlSerializer();
const CustomUrlSerializerProvider = {
provide: UrlSerializer,
useValue: customUrlSerializer
};
@NgModule({
declarations: [
AppComponent,
],
imports: [
BrowserModule.withServerTransition({ appId: 'serverApp' }),
HttpClientModule,
BrowserAnimationsModule,
LoaderModule,
CoreModule,
QuestionsModule,
AuthModule,
ServerErrorModule,
],
providers: [
SeoSocialSharedService,
{ provide: ErrorHandler, useClass: AuthErrorHandler },
CustomUrlSerializerProvider,
GoogleAnalyticsEventsService
],
bootstrap: [AppComponent]
})
export class AppModule {}
和问题路由文件:
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { AuthGuard } from '../auth/auth-guard.service';
import { QuestionsComponent } from './questions.component';
import { QuestionAskComponent } from './question-ask/question-ask.component';
import { QuestionDetailComponent } from './question-detail/question-detail.component';
const questionRoutes: Routes = [
{ path: 'questions', component: QuestionsComponent },
{ path: ':questions/:id/:title', component: QuestionDetailComponent },
{ path: ':questions/new', component: QuestionAskComponent, canActivate: [AuthGuard] },
]
@NgModule({
imports: [
RouterModule.forChild(questionRoutes)
],
exports: [RouterModule]
})
export class QuestionsRoutingModule {
}
所以一切都保持不变,以防万一使常春藤为真,问题路线(加载组件)不起作用。 其他路线工作正常。 也许我错过了一些东西,必须在 v9 中更改???
如果有人有任何想法,他们是最受欢迎的! 谢谢你。
我发现了问题。 我通过问题组件一步一步地评论每一行。 问题是在问题子组件之一中提供 AuthService 时! 似乎构造函数中提供的 Auth 服务尚未“存在”,也就是未初始化。
因此,解决方案是在 AuthService 中,而不是仅使用装饰器 @Injectable,我现在在应用程序的根目录中提供此服务,因为它应该是:
@Injectable({
providedIn: 'root'
})
无论如何,有趣的是,如果 ivy 设置为 false,它就可以工作。 新引擎似乎发生了一些变化。 希望它可以在需要时帮助某人
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