declare const checkTypes: readonly ["Array", "AbortSignal", "AbortController", "String", "Function", "AsyncFunction", "Number", "Boolean", "Symbol", "Null", "Promise"];
declare const specialCheckFunctions: {
    Date: (value: unknown) => boolean;
    Object: typeof isObject;
    Headers: typeof isHeaders;
};
type CheckFunctions = typeof specialCheckFunctions & {
    [checkType in typeof checkTypes[number]]: (value: unknown) => boolean;
};
declare const checkFunctions: CheckFunctions;
declare function isObject(income: unknown): income is Record<string | number | symbol, unknown>;
declare function isHeaders(income: unknown): income is Headers;
export { checkFunctions as is };