import type { ApolloElementInterface } from '@apollo-elements/interfaces/apollo-element';
interface PropertyEffectOptions<C extends ApolloElementInterface> {
    /** Name of the property. */
    name: keyof C;
    /** The property's initial value. */
    init?: C[keyof C];
    /**
     * Side effect to run when setting the property.
     *
     * @this bound to the element instance.
     * @param value The new value.
     */
    onSet(this: C, value: C[keyof C]): void;
}
/**
 * Creates a `PropertyDescriptor` for a boolean property that reflects to a boolean attribute
 *
 * @param  attr Attribute name
 */
export declare function booleanAttr<C extends ApolloElementInterface>(attr: string): PropertyDescriptor;
/**
 * Creates a `PropertyDescriptor` for a property that runs a given side effect when set.
 *
 * @param options Configuration for the property: it's name, initial value, and setter side-effect.
 */
export declare function effect<C extends ApolloElementInterface>(options: PropertyEffectOptions<C>): PropertyDescriptor;
/**
 * Creates a `PropertyDescriptor` for an `ApolloElement`'s `document` property.
 */
export declare function gqlDocument<C extends ApolloElementInterface>(): PropertyDescriptor;
/**
 * Creates a `PropertyDescriptor` for a writable property.
 *
 * @param  init The property's initial value.
 */
export declare function writable(init?: unknown): PropertyDescriptor;
export {};