import { AnyFunction } from "../types";
import type { ExtensionEndpointHandler } from "../types";
export declare const isFunction: (x: unknown) => x is AnyFunction;
export declare function includes<T extends U, U>(coll: ReadonlyArray<T>, el: U): el is T;
export declare function isExtensionEndpointHandler(obj: object): obj is ExtensionEndpointHandler;
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