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const usersFromForm$ = this.form.valueChanges.pipe(
startWith(null),
map(item => item && typeof item === 'object' ? item.fullName : item),
switchMap(name => name ? this.filter(name) : this.options.asObservable())
const buttonClick$ = new Subject();
const filteredUsers$ = merge(
buttonClick$.pipe(mapTo(null)),
usersFromForm$,
);
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const usersFromForm$ = this.form.valueChanges.pipe(
startWith(null),
map(item => item && typeof item === 'object' ? item.fullName : item),
switchMap(name => name ? this.filter(name) : this.options.asObservable())
const buttonClick$ = new Subject();
const filteredUsers$ = merge(
buttonClick$.pipe(mapTo(null)),
usersFromForm$,
);
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