import { FormControl, FormGroup, ValidatorFn } from '@angular/forms';
import { TerraFormFieldInterface } from '../model/terra-form-field.interface';
/**
 * @description This class provides functionality which may be used in relation to the <terra-form> and reactive forms.
 */
export declare class TerraFormHelper {
    /**
     * @description Generates a list of validators based on the given formField's options that may be attached to a FormControl instance.
     * @param formField
     */
    static generateValidators(formField: TerraFormFieldInterface): Array<ValidatorFn>;
    /**
     * @description Parses a set of _formFields (TerraFormFieldInterface) and creates a representative FormGroup instance.
     * @description Generates a list of validators based on the given formField's options that may be attached to a FormArray instance.
     * @param formField
     */
    static generateFormArrayValidators(formField: TerraFormFieldInterface): Array<ValidatorFn>;
    /**
     * This FormGroup instance may be initialized by passing a set of values.
     * @param formFields
     * @param values
     */
    static parseReactiveForm(formFields: {
        [key: string]: TerraFormFieldInterface;
    }, values?: {}): FormGroup;
    /**
     * @description Recursively scans the given form for FormArray instances and adapts the amount of controls of those FormArrays to the
     *     amount of values that will be patched to them.
     * @param form
     * @param formFields
     * @param values
     */
    static updateFormArrays(form: FormGroup, formFields: {
        [key: string]: TerraFormFieldInterface;
    }, values: any): any;
    /**
     * @description Creates a new FormControl or FormGroup instance depending on whether the given formField has children or not.
     * The given value is used to initialize the control's value.
     * @param value
     * @param formField
     */
    static createNewControl(value: any, formField: TerraFormFieldInterface): FormControl | FormGroup;
    /**
     * @description sanitise a string containing css-classes. Check whether it contains only valid bootstrap grid classes.
     * @param width
     */
    static sanitiseWidth(width: string): string;
    /**
     * @description Fits the given list of controls into the range of the given formField by adding/removing controls.
     * @param formField
     * @param controls
     */
    private static _fitControlsToRange;
}