import { Context } from '../context';
import { ContextBindingController } from '../ContextBindingController';
import { ContextConsumerController } from '../ContextConsumerController';
/**
 * Binds attributes to a context.
 */
export declare class ContextAttrsController extends ContextBindingController<string> {
    protected _transformers: Map<string, (attrName: string, value: any) => any>;
    /**
     * Binds a context to a attribute on the current `ref` element. By binds we mean as the
     * context value changes it will update the given attribute on the current `ref` element.
     *
     * @param context The context to bind to.
     * @param attrName The name of the attribute to bind the context to.
     * @param transformer An optional transformer to transform the context value before it is
     * stringified and applied as the attribute value. Returning a falsy value such as `null`,
     * `undefined` or `false` will remove the attribtue.
     */
    bind<T>(context: Context<T>, attrName: string, transformer?: (value: T) => any): this;
    protected _handleBindToContext(): void;
    protected _handleBindingUpdate(consumer: ContextConsumerController<any>, attrName: string): void;
    protected _handleUnbindFromContext(_: ContextConsumerController<any>, attrName: string): void;
    /**
     * Override to transform attribute names.
     */
    protected _transformAttrName(attrName: string): string;
    /**
     * Override to transform context values. Returning a falsy value such as `null`, `undefined` or
     * `false` will remove the attribtue. This is provided as the default transformer when one
     * isn't provided in the `bind()` method call.
     */
    protected _transformAttrValue(attrName: string, value: any): any;
}