The old way to build an Ethereum module that exposes the WEB3 Token

minimum-ethModule.ts

import { InjectionToken } from '@angular/core';
import { CommonModule } from '@angular/common';
import Web3 from 'web3';

// Create an Injection Token with web3 inside
export const WEB3 = new InjectionToken<Web3>('web3');

@NgModule({
 imports: [
  CommonModule,
],
 providers: [{
         provide: WEB3,
         useFactory: () => new Web3(Web3.givenProvider || "ws://localhost:8546"),
  }]
})
export class EthereumModule {}