refactor search service

src/lib/search/search.service.ts

@@ -1,31 +1,19 @@
 import { Injectable } from '@angular/core';
-import { FormBuilder } from '@angular/forms';
-import { map, startWith } from 'rxjs/operators';
+import { BehaviorSubject } from 'rxjs';
 import { KeysOf } from '../utils/types/utility-types';
 
-const controlsConfig = {
-    query: ['']
-} as const;
-
-type FormControls = { [key in KeysOf<typeof controlsConfig>]: string };
-
 @Injectable()
 export class SearchService<T> {
-    readonly searchForm = this._formBuilder.group(controlsConfig);
-    readonly valueChanges$ = this.searchForm.valueChanges.pipe(
-        startWith(''),
-        map((values: FormControls) => values.query)
-    );
+    private readonly _query$ = new BehaviorSubject('');
+    readonly valueChanges$ = this._query$.asObservable();
     private _searchKey!: KeysOf<T>;
 
-    constructor(private readonly _formBuilder: FormBuilder) {}
-
     get searchValue(): string {
-        return this.searchForm.get('query')?.value as string;
+        return this._query$.getValue();
     }
 
     set searchValue(value: string) {
-        this.searchForm.patchValue({ query: value });
+        this._query$.next(value);
     }
 
     searchIn(entities: T[]): T[] {
@@ -40,7 +28,7 @@ export class SearchService<T> {
     }
 
     reset(): void {
-        this.searchForm.reset({ query: '' }, { emitEvent: true });
+        this._query$.next('');
     }
 
     private _searchField(entity: T): string {