import { FormGroupState, FormState, KeyValue } from '../state';
import { ProjectFn2 } from './util';
export declare type StateUpdateFns<TValue extends KeyValue> = {
    [controlId in keyof TValue]?: ProjectFn2<FormState<TValue[controlId]>, FormGroupState<TValue>>;
};
/**
 * This update function takes one or more update function objects and returns
 * a projection function that applies all objects one after another to a form
 * group state.
 *
 * The following (contrived) example uses this function to validate the child
 * control `name` to be required and set the child control `email`'s value to
 * be `''` if the name is invalid.
 *
 * ```typescript
 * interface FormValue {
 *   name: string;
 *   email: string;
 * }
 *
 * const groupUpdateFn = updateGroup<FormValue>(
 *   {
 *     name: validate<string>(required),
 *   },
 *   {
 *     email: (email, parentGroup) =>
 *       parentGroup.controls.name.isInvalid
 *         ? setValue('', email)
 *         : email,
 *   },
 * );
 * const updatedState = groupUpdateFn(state);
 * ```
 */
export declare function updateGroup<TValue>(updateFn: StateUpdateFns<TValue>, ...updateFnsArr: StateUpdateFns<TValue>[]): (state: FormGroupState<TValue>) => FormGroupState<TValue>;
/**
 * This update function takes an array of update function objects and
 * returns a projection function that applies all objects one after another to
 * a form group state.
 *
 * The following (contrived) example uses this function to validate the child
 * control `name` to be required and set the child control `email`'s value to
 * be `''` if the name is invalid.
 *
 * ```typescript
 * interface FormValue {
 *   name: string;
 *   email: string;
 * }
 *
 * const groupUpdateFn = updateGroup<FormValue>(
 *   [
 *     {
 *       name: validate<string>(required),
 *     },
 *     {
 *       email: (email, parentGroup) =>
 *         parentGroup.controls.name.isInvalid
 *           ? setValue('', email)
 *           : email,
 *     },
 *   ],
 * );
 * const updatedState = groupUpdateFn(state);
 * ```
 */
export declare function updateGroup<TValue>(updateFnsArr: StateUpdateFns<TValue>[]): (state: FormGroupState<TValue>) => FormGroupState<TValue>;
/**
 * This update function takes a form group state and one or more update
 * function objects and applies all objects one after another to the state.
 * Providing multiple update function objects is mainly useful if the result
 * of a later object depends on the result of previous objects.
 *
 * The following (contrived) example uses this function to validate the child
 * control `name` to be required and set the child control `email`'s value to
 * be `''` if the name is invalid.
 *
 * ```typescript
 * interface FormValue {
 *   name: string;
 *   email: string;
 * }
 *
 * const updatedState = updateGroup<FormValue>(
 *   state,
 *   {
 *     name: validate<string>(required),
 *   },
 *   {
 *     email: (email, parentGroup) =>
 *       parentGroup.controls.name.isInvalid
 *         ? setValue('', email)
 *         : email,
 *   },
 * );
 * ```
 */
export declare function updateGroup<TValue>(state: FormGroupState<TValue>, updateFn: StateUpdateFns<TValue>, ...updateFnsArr: StateUpdateFns<TValue>[]): FormGroupState<TValue>;
/**
 * This update function takes a form group state and an array of update
 * function objects and applies all objects one after another to the state.
 * Providing multiple update function objects is mainly useful if the result
 * of a later object depends on the result of previous objects.
 *
 * The following (contrived) example uses this function to validate the child
 * control `name` to be required and set the child control `email`'s value to
 * be `''` if the name is invalid.
 *
 * ```typescript
 * interface FormValue {
 *   name: string;
 *   email: string;
 * }
 *
 * const updatedState = updateGroup<FormValue>(
 *   state,
 *   [
 *     {
 *       name: validate<string>(required),
 *     },
 *     {
 *       email: (email, parentGroup) =>
 *         parentGroup.controls.name.isInvalid
 *           ? setValue('', email)
 *           : email,
 *     },
 *   ],
 * );
 * ```
 */
export declare function updateGroup<TValue>(state: FormGroupState<TValue>, updateFnsArr: StateUpdateFns<TValue>[]): FormGroupState<TValue>;