import * as React from "react";
import { FieldMap } from "./types";
import { FieldContext } from "./FieldContext";
import { WithFormScopeProps } from "./helpers";
import { FormEvent } from "./EventBus";
import { ScopeContext } from "./ScopeContext";
export interface Formatter {
    (value: any, output: boolean): any;
}
export declare type GetClassName = (field: FieldContext) => string;
export declare type FieldProps<ElementType> = {
    name: string;
    className?: string | GetClassName;
    validateOnChange?: boolean;
    format?: Formatter;
    keepChangesOnUnmount?: boolean;
    validate?(field: string, values: FieldMap): string | null;
    onFocus?(ev: React.FocusEvent<ElementType>, scope: ScopeContext): void;
    onChange?(ev: React.ChangeEvent<ElementType>, scope: ScopeContext): void;
    onBlur?(ev: React.FocusEvent<ElementType>, scope: ScopeContext): void;
};
export declare abstract class HTMLFieldComponent<Props extends FieldProps<ElementType>, ElementType extends HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement, State = {}> extends React.PureComponent<WithFormScopeProps<Props>, State> {
    private unsubscribe;
    protected field: FieldContext;
    protected element: ElementType;
    constructor(props: WithFormScopeProps<Props>, context: any);
    /**
     * Inform the scope that this field exists and subscribe to scope events.
     */
    componentWillMount(): void;
    /**
     * Unsubscribe from scope events and clear the field context.
     */
    componentWillUnmount(): void;
    /**
     * Returns the formatted value for the field.
     */
    protected readonly value: string;
    /**
     * Generates and return the class names for the element.
     */
    protected readonly classes: string;
    /**
     * Format input using a given formatter prop.
     */
    protected format(value: any, output: boolean): any;
    /**
     * Trigger an update for this field.
     */
    protected triggerUpdate: () => void;
    /**
     * Bind the element reference for the field.
     */
    protected bindRef(el: ElementType): void;
    /**
     * Process incoming scope events.
     */
    protected handleScopeEvent: (ev: FormEvent) => void;
    /**
     * Handle focus events for this field.
     */
    protected handleFocus(ev: React.FocusEvent<ElementType>): void;
    /**
     * Handle blur events for this field.
     */
    protected handleBlur(ev: React.FocusEvent<ElementType>): void;
    /**
     * Handle change events for this field.
     */
    protected handleChange(ev: React.ChangeEvent<ElementType>): void;
    /**
     * Validates the field and return either the error message or null.
     */
    protected validateSelf(): any;
}