Material angular autocomplete keeps giving me error - angularjs

Question

I am trying to make this demo work but somehow it is not working for me. It keeps giving me error
servers.component.ts
import { Component } from '#angular/core';
import {FormControl} from '#angular/forms';
import {Observable} from 'rxjs/Observable';
import {startWith} from 'rxjs/operators/startWith';
import {map} from 'rxjs/operators/map';
#Component({
selector: 'app-servers',
templateUrl: './servers.component.html',
styleUrls: ['./servers.component.css']
})
export class User {
constructor(public name: string) { }
}
export class ServersComponent {
myControl = new FormControl();
options = [
new User('Mary'),
new User('Shelley'),
new User('Igor')
];
filteredOptions: Observable<User[]>;
ngOnInit() {
this.filteredOptions = this.myControl.valueChanges
.pipe(
startWith<string | User>(''),
map(value => typeof value === 'string' ? value : value.name),
map(name => name ? this.filter(name) : this.options.slice())
);
}
filter(name: string): User[] {
return this.options.filter(option =>
option.name.toLowerCase().indexOf(name.toLowerCase()) === 0);
}
displayFn(user?: User): string | undefined {
return user ? user.name : undefined;
}
}
I have imported both User class and ServersComponent in app.module.ts.
import { BrowserModule } from '#angular/platform-browser';
import { NgModule } from '#angular/core';
import { AlertModule } from 'ngx-bootstrap';
import "hammerjs";
import { BrowserAnimationsModule } from '#angular/platform-browser/animations';
import {MatButtonModule, MatInputModule } from '#angular/material';
import { FormsModule, ReactiveFormsModule } from '#angular/forms';
import { AppComponent } from './app.component';
import { ServerComponent } from './server/server.component';
import { ServersComponent, User } from './servers/servers.component';
import { MyFormComponent } from './my-form/my-form.component';
import {MatCheckboxModule} from '#angular/material/checkbox';
import {MatAutocompleteModule} from '#angular/material/autocomplete';
#NgModule({
declarations: [
AppComponent,
ServerComponent,
ServersComponent,
MyFormComponent,
User,
],
imports: [
BrowserModule,
BrowserAnimationsModule,
AlertModule.forRoot(),
FormsModule,
ReactiveFormsModule,
MatButtonModule,
MatInputModule,
MatCheckboxModule,
MatAutocompleteModule,
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
However if i use this demo it is working fine.
Can you let me know what I am doing wrong in my code.

Answer 1

Problem lies in this line,
import { ServersComponent, User } from './servers/servers.component';
Usually you can have only one component from a select/component. Remove User from the same.
To add more on the issue, you should not export two classes from same component. change your component as,
import { Component } from '#angular/core';
import {FormControl} from '#angular/forms';
import {Observable} from 'rxjs/Observable';
import {startWith} from 'rxjs/operators/startWith';
import {map} from 'rxjs/operators/map';
#Component({
selector: 'app-servers',
templateUrl: './servers.component.html',
styleUrls: ['./servers.component.css']
})
export class ServersComponent {
myControl = new FormControl();
options = [
new User('Mary'),
new User('Shelley'),
new User('Igor')
];
filteredOptions: Observable<User[]>;
ngOnInit() {
this.filteredOptions = this.myControl.valueChanges
.pipe(
startWith<string | User>(''),
map(value => typeof value === 'string' ? value : value.name),
map(name => name ? this.filter(name) : this.options.slice())
);
}
filter(name: string): User[] {
return this.options.filter(option =>
option.name.toLowerCase().indexOf(name.toLowerCase()) === 0);
}
displayFn(user?: User): string | undefined {
return user ? user.name : undefined;
}
}