详解Angular6 热加载配置方案

Angular6热加载配置方案，分享给大家，具体如下：示例ng版本如下：$ng--version__________/\________

Angular6 热加载配置方案，分享给大家，具体如下：

示例 ng 版本如下 ：

$ ng --version

 _ _ ____ _ ___
 / \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
 / △ \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
 / ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
 /_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
 |___/


Angular CLI: 6.0.8
Node: 8.11.1
OS: win32 x64
Angular: 6.1.3
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.6.8
@angular-devkit/build-angular 0.6.8
@angular-devkit/build-optimizer 0.6.8
@angular-devkit/core 0.6.8
@angular-devkit/schematics 0.6.8
@angular/cli 6.0.8
@ngtools/webpack 6.0.8
@schematics/angular 0.6.8
@schematics/update 0.6.8
rxjs 6.2.2
typescript 2.7.2
webpack 4.8.3

安装 hmr 依赖包

npm install --save-dev @angularclass/hmr --registry https://registry.npm.taobao.org

配置 hmr 文件

在 src/environments 目录下添加 environment.hmr.ts 配置文件

文件内容如下 ：

export const environment = {
 production: false,
 hmr: true
};

然后分别在 environment.prod.ts 和 environment.ts 添加 hmr:false 配置项

配置 src/tsconfig.app.json 文件

"compilerOptions": {
 ...
 "types": ["node"]
}

如果不配置上面的 "types":["node"], 则会报错

ERROR in src/main.ts(16,7): error TS2304: Cannot find name 'module'. src/main.ts(17,18): error TS2304: Cannot find name 'module'.

配置 src/hmr.ts 文件内容如下

import { NgModuleRef, ApplicationRef } from "@angular/core";
import { createNewHosts } from "@angularclass/hmr";

export const hmrBootstrap = (
 module: any,
 bootstrap: () => Promise<NgModuleRef<any>>
) => {
 let ngModule: NgModuleRef<any>;
 module.hot.accept();
 bootstrap().then(mod => (ngModule = mod));
 module.hot.dispose(() => {
 const appRef: ApplicationRef = ngModule.injector.get(ApplicationRef);
 const elements = appRef.components.map(c => c.location.nativeElement);
 const makeVisible = createNewHosts(elements);
 ngModule.destroy();
 makeVisible();
 });
};

更新 src/main.ts 文件内容如下

import { enableProdMode } from "@angular/core";
import { platformBrowserDynamic } from "@angular/platform-browser-dynamic";

import { AppModule } from "./app/app.module";
import { environment } from "./environments/environment";

import { hmrBootstrap } from "./hmr";

if (environment.production) {
 enableProdMode();
}

const bootstrap = () => platformBrowserDynamic().bootstrapModule(AppModule);

if (environment.hmr) {
 if (module["hot"]) {
 hmrBootstrap(module, bootstrap);
 } else {
 console.error("HMR is not enabled for webpack-dev-server!");
 console.log("Are you using the --hmr flag for ng serve?");
 }
} else {
 bootstrap().catch(err => console.log(err));
}

配置 angular.json 文件

...
"build": {
 "builder": "@angular-devkit/build-angular:browser",
 "options": {
 "outputPath": "dist/ng6",
 "index": "src/index.html",
 "main": "src/main.ts",
 "polyfills": "src/polyfills.ts",
 "tsConfig": "src/tsconfig.app.json",
 "assets": ["src/favicon.ico", "src/assets"],
 "styles": ["src/styles.css"],
 "scripts": []
 },
 "configurations": {
 "hmr": {
 "fileReplacements": [
 {
 "replace": "src/environments/environment.ts",
 "with": "src/environments/environment.hmr.ts"
 }
 ]
 },
 "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
 }
 }
},
...
"serve": {
 "builder": "@angular-devkit/build-angular:dev-server",
 "options": {
 "browserTarget": "ng6:build"
 },
 "configurations": {
 "production": {
 "browserTarget": "ng6:build:production"
 },
 "hmr": {
 "browserTarget": "ng6:build:hmr",
 "hmr": true
 }
 }
},

启动应用

• 方式一：ng serve --configuration hmr
• 方式二：ng run ng6:serve:hmr

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

Angular6 热加载 Angular6 热加载配置