disable-control.directive.ts

import {Directive, Input} from '@angular/core';
import {NgControl} from '@angular/forms';

@Directive({
    selector: '[disableControl]',
})
export class DisableControlDirective {
    @Input()
    set disableControl(disabled: boolean) {
        const method = disabled ? 'disable' : 'enable';
        this.ngControl.control[method]();
    }

    constructor(private ngControl: NgControl) {}
}