import { AbstractControl, FormGroup } from '@angular/forms';
import { Observable } from 'rxjs';
export declare class MtnaWfNgFormService {
    private ngForm;
    private unsavedChanges$;
    private valueChangeSubscription;
    /**
     * Informs a caller when the MtnaForm is dirty and has unsaved changes.
     */
    readonly unsavedChanges: Observable<boolean>;
    /**
     * Adds or removes a control from the ngForm
     * @param controlId id of the control being added/removed
     * @param parentIds array of ids representing the path to the parent control
     * @param action Whether to add or remove the control
     * @param newControl the new form control to be added
     */
    addOrRemoveControl(controlId: string, parentIds: string[], action: 'ADD' | 'REMOVE', newControl?: AbstractControl): void;
    /**
     * Get the form if it exists
     * @returns the angular form or null
     */
    getForm(): FormGroup | null;
    /**
     * Returns a JSON representation of form values
     */
    getFormValue(): any;
    /**
     * @returns Whether a form has been set on this service
     */
    hasForm(): boolean;
    /**
     * @returns Whether the form is dirty.
     */
    isFormDirty(): boolean;
    /**
     * Unsubscribes from value changes & sets the ngForm to null.
     * Should be called when any component using an MtnaForm is destroyed.
     */
    disposeForm(): void;
    /**
     * Forces the unsavedChanges observable to emit true.
     * Use with care, one example is when repeatable items are added/removed from the form.
     */
    forceUnsavedChange(): void;
    /**
     * Marks ngForm as pristine & untouched.
     */
    markAsPristineAndUntouched(): void;
    /**
     * Resets the ngForm.
     */
    resetForm(): void;
    /**
     * Sets a FormGroup on the service so an external source may observe changes.
     * @param ngForm FormGroup to be registered.
     */
    setForm(ngForm: FormGroup): void;
    /**
     * Subscribes to ngForm status changes & updates the unsavedChanges observable
     */
    private observeNgFormChanges;
    /**
     * Removes the ngForm status change subscription.
     */
    private unsubscribeValueChanges;
}