HMR未使用Angular CLI更新视图

时间:2018-06-12 05:56:47

标签: angular angular-cli webpack-hmr angular-cli-v6

我最近将我的角度应用更新到了最新版本。经过一夜的噩梦之后,除了HMR之外,我得到了一切。我坚持不懈。以下是根据Angular CLI wiki上的HMR故事的配置:

angular.json

      "build": {
              "configurations": {
                "hmr": {
                  "fileReplacements": [
                    {
                      "replace": "src/environments/environment.ts",
                      "with": "src/environments/environment.hmr.ts"
                    }
                  ]
                }
              }
            },
 "serve": {
          "configurations": {
            "hmr": {
              "hmr": true,
              "browserTarget": "appHit:build:hmr"
            },
          }
        },

hmr.js

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();
  });
};

main.ts

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));
}

我尝试了以下命令:

ng serve --hmr

ng serve --hmr --configuration hmr

ng serve --configuration hmr

所有内容都会在更改时编译,甚至触发的事件都会缓存在浏览器中,但HMR记录以下内容后没有任何反应:

[WDS] App updated. Recompiling...
[WDS] App hot update...

此时我完全迷失了。任何形式的帮助将非常感谢。谢谢

4 个答案:

答案 0 :(得分:2)

我们遇到了同样的问题。通过删除与Webpack相关的开发人员依赖项并执行全新的npm安装,可以解决该问题。

rm -R package-lock.json node_modules npm cache clean --force npm i

希望它可以提供帮助。

答案 1 :(得分:0)

有点晚了...对我有用的是在我的ClientApp文件夹中,我有一个/ dist文件夹,带有所有js位...如果有dist文件夹,HMR将无法工作。如果您进行构建,则dist到达那里。删除dist文件夹,然后运行ng serve。以我为例,我托管了一个.net核心应用程序,因此我构建了该应用程序并针对我的角度应用程序进行了启动。

答案 2 :(得分:0)

我认为这可能对某些人有帮助。我通过更新到Angular版本7并在main.ts中为HMR添加以下行来解决了我的问题

module['hot'].accept();

如下:

if (environment.hmr) {
    if (module['hot']) {
        module['hot'].accept();
        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 {
    console.log('hot');
    bootstrap().catch(err => console.log(err));
}

到目前为止,HMR一直运行良好。我没有时间进一步调试它,但很可能是依赖性不兼容可能导致了它的终止

答案 3 :(得分:-1)

这是我的设置,目前在最新版本下工作得很好。如果您不需要,可以删除ngrx内容: - )

// main.ts

// ...
import { 
  bootloader, createInputTransfer, createNewHosts, removeNgStyles 
} from '@angularclass/hmr/dist/helpers'; // For correct treeshaking    

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

type HmrModule<S> = {
  appRef: ApplicationRef,
}
type HmrNgrxModule<S, A> = HmrModule<S> & {
  store: { dispatch: (A) => any } & Observable<S>,
  actionCreator: (s: S) => A
}

const isNgrxModule = 
  <S, A, M extends HmrNgrxModule<S, A>>(instance: HmrModule<S> | HmrNgrxModule<S, A>)
  : instance is M =>
    !!((<M>instance).store && (<M>instance).actionCreator);

function processModule<S, A, M extends HmrModule<S> | HmrNgrxModule<S, A>>(ngModuleRef: NgModuleRef<M>) {

  const hot = module['hot'];
  if (hot) {

    hot['accept']();

    const instance = ngModuleRef.instance;
    const hmrStore = hot['data'];

    if (hmrStore) {
      hmrStore.rootState 
        && isNgrxModule(instance) 
        && instance.store.dispatch(instance.actionCreator(hmrStore.rootState));
      hmrStore.restoreInputValues && hmrStore.restoreInputValues();
      instance.appRef.tick();
      Object.keys(hmrStore).forEach(prop => delete hmrStore[prop]);
    }

    hot['dispose'](hmrStore => {
      isNgrxModule(instance) && instance.store.pipe(take(1)).subscribe(s => hmrStore.rootState = s);
      const cmpLocation = instance.appRef.components.map(cmp => cmp.location.nativeElement);
      const disposeOldHosts = createNewHosts(cmpLocation);
      hmrStore.restoreInputValues = createInputTransfer();
      removeNgStyles();
      ngModuleRef.destroy();
      disposeOldHosts();
    });
  }
  else {
    console.error('HMR is not enabled for webpack-dev-server!');
    console.log('Are you using the --hmr flag for ng serve?');
  }

  return ngModuleRef;
}

const bootstrap = () => platformBrowserDynamic().bootstrapModule(AppModule);
const hmrBootstrap = () => bootloader(() => bootstrap().then(processModule));

environment.hmr
  ? hmrBootstrap()
  : bootstrap();
// app.module.ts

// ...
export class AppModule {
  constructor(
    public appRef: ApplicationRef 
    // , ...
  ){}
}
// angular.json

"build": {
  "configurations": {
    "hmr": {
      "fileReplacements": [
        {
          "replace": "src/environments/environment.ts",
          "with": "src/environments/environment.hmr.ts"
        }
      ]
    }
  }
},
"serve": {
  "configurations": {
    "hmr": {
      "browserTarget": "AppName:build:hmr"
    }
  }
}

我用ng serve --hmr -c=hmr

运行它

我希望这有点帮助: - )