shared.module.ts

@NgModule({
  imports: [
    ...
    MatIconModule
  ],
  declarations: [   ...  ],
  exports: [  
    ...
    MatIconModule
  ],
})
export class SharedModule {
  constructor(
    private matIconRegistry: MatIconRegistry,
    private domSanitizer: DomSanitizer
  ) {
    matIconRegistry.addSvgIconSet(
      domSanitizer.bypassSecurityTrustResourceUrl("/assets/symbol-defs.svg")
    );
  }
}