interface EJSONableCustomType {
  clone(): EJSONableCustomType;
  equals(other: Object): boolean;
  toJSONValue(): JSONable;
  typeName(): string;
}
interface EJSONable {
  [key: string]: number | string | boolean | Object | number[] | string[] | Object[] | Date | Uint8Array | EJSONableCustomType;
}
interface JSONable {
  [key: string]: number | string | boolean | Object | number[] | string[] | Object[];
}
interface EJSON extends EJSONable { }

declare module EJSON {
  function addType(name: string, factory: (val: JSONable) => EJSONableCustomType): void;
  function clone<T>(val: T): T;
  function equals(a: EJSON, b: EJSON, options?: {
    keyOrderSensitive?: boolean;
  }): boolean;
  function fromJSONValue(val: JSONable): any;
  function isBinary(x: Object): boolean;
  var newBinary: any;
  function parse(str: string): EJSON;
  function stringify(val: EJSON, options?: {
    indent?: boolean | number | string;
    canonical?: boolean;
  }): string;
  function toJSONValue(val: EJSON): JSONable;
}