/**
 * Envoy is a ProxyHandler implementation designed to proxy an object
 * and all its subproperties. Envoy automatically creates new Proxies
 * when it encounters un-proxied objects in the root object hierarchy.
 *
 * @internal
 */
export declare abstract class Envoy {
    /**
     * Create the root Proxy object.
     *
     * @param obj - Optional. Any additional arguments.
     *
     * @returns A new object Proxy.
     *
     * @virtual Override if the constructor is also overridden.
     */
    static create(obj: {} | unknown[]): {} | unknown[];
    /**
     * Check whether a value is an object.
     *
     * @param obj - Value to test.
     *
     * @returns A boolean indicating whether obj is an object.
     */
    protected static _isObject(obj: unknown): obj is object;
    /**
     * ProxyHandler.get implementation.
     *
     * @param obj - Proxied object.
     * @param prop - The name of the property to get.
     *
     * @returns The value of `prop` on `obj`.
     *
     * @remarks Returns true if prop is `__isProxy__`.
     */
    get<T>(obj: {} | unknown[], prop: string): T | undefined;
    /**
     * ProxyHandler.set implementation.
     *
     * @param obj - Proxied object.
     * @param prop - Property name.
     * @param val - Value to set.
     *
     * @returns A value indicating whether the property was set.
     */
    set<T>(obj: {} | unknown[], prop: string, val: T): boolean;
    /**
     * Invoked when retrieving any value from the proxied
     * object.
     *
     * @param prop - Property name.
     * @param val - Property value.
     *
     * @returns The value to return from the proxy.
     *
     * @remarks onGetValue is not called when checking the
     * `__isProxy__` property.
     *
     * @virtual
     */
    onGetValue<T>(prop: string, val: T): T;
    /**
     * Invoked when a new Envoy Proxy needs to be created.
     *
     * @param prop - Property name for val on the parent object.
     * @param val - Object to proxy.
     *
     * @returns A new proxied object.
     *
     * @virtual Override if the constructor is also overridden.
     */
    onNewEnvoy<T extends {} | unknown[]>(prop: string, val: T): {};
    /**
     * Invoked before setting any value on the proxied
     * object.
     *
     * @param prop - Property name.
     * @param val - Property value.
     *
     * @returns The value to set on the proxy.
     *
     * @virtual
     */
    onBeforeSetValue<T>(prop: string, val: T): T;
    /**
     * Invoked after a property is set on the proxied object.
     *
     * @param prop - Property name.
     * @param val - Property value.
     *
     * @virtual
     */
    onSetValue<T>(prop: string, val: T): void;
    /**
     * @virtual
     */
    protected constructor();
}
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