What should I do if the Component 'MyComponentComponent' is declared by more than one NgModule is declared by more than one NgModule when the same component is introduced into multiple pages in Angular?

One day, I wrote a self-confident custom component myComponent, imported and used it on multiple pages, and the console gave me this

I have taken off my pants. What do you mean by this hint?

A closer look at The Component 'MyComponentComponent' is declared by more than one NgModule

what the hell? Say my component is used by multiple modules? What are you doing, I just want multiple pages to use! ! !

Usually the above error occurs because of the use of lazy loading routing (similar to the following)

const routes: Routes = [

...

  {
    path: 'first',
    loadChildren: () => import('./com/first/first.module').then(m => m.FirstModule),//异步加载、惰性加载、懒加载
  }, 

...

]

So I checked the official documentation and found a shared.module.ts stuff

First find a clean folder and create a

shared.module.ts

import { CommonModule } from '@angular/common';
import { NgModule } from '@angular/core';
import { MyComponentComponent } from 'src/app/my-component/my-component.component';

// 这里加入自定义公共组件----------------------------------------
let declarations = [
  MyComponentComponent,
];

@NgModule({
  imports: [CommonModule,], //公共组件依赖的第三方组件可以在此处引入
  declarations,
  exports: declarations,
})
export class SharedModule { }

Go to the page Module file that needs to use the relevant public components

first.module.ts

import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { SharedModule } from '../../shared.module';
import { FirstComponent } from './first.component';

@NgModule({
  imports: [
    SharedModule,//这里引入公共组件模块（共享特性模块）
    RouterModule.forChild([{ path: '', component: FirstComponent }]),//这句不加不会生效
  ],
  declarations: [FirstComponent,]
})
export class FirstModule { }

first.component.html

first
<app-my-component></app-my-component>

second.module.ts

import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { SharedModule } from '../../shared.module';
import { SecondComponent } from './second.component';

@NgModule({
  imports: [
    SharedModule,//这里引入公共组件模块（共享特性模块）
    RouterModule.forChild([{ path: '', component: SecondComponent }]),//这句不加不会生效
  ],
  declarations: [SecondComponent,]
})
export class SecondModule { }

second.component.html

second
<app-my-component></app-my-component>

my-component.component.html

<h1>我特么终于没报错啦！</h1>

 The routing is configured by itself, and you can directly access http://localhost:4200/first

Visit http://localhost:4200/second