Proposed JSON type definition update

lib.es5.d.ts

/** A parsed JSON value. */
export type json =
    | string
    | number
    | boolean
    | null
    | json[]
    | { [key: string]: json };

/** A JSON stringify-able value. */
export type jsonable =
    | string
    | number
    | boolean
    | null
    | undefined
    | jsonable[]
    | { [key: string]: jsonable }
    | { toJSON(): jsonable };

interface JSON {
    /**
     * Converts a JavaScript Object Notation (JSON) string into an object.
     * @param text A valid JSON string.
     */
    parse(text: string): json;
    /**
     * Converts a JavaScript Object Notation (JSON) string into an object.
     * @param text A valid JSON string.
     * @param reviver A function that transforms the results. This function is called for each member of the object.
     * If a member contains nested objects, the nested objects are transformed before the parent object is.
     */
    parse(text: string, reviver?: (this: json, key: string, value: json) => any): any;
    /**
     * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
     * @param value A JavaScript value, usually an object or array, to be converted.
     * @param space Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
     */
    stringify(value: jsonable, replacer?: never, space?: string | number): string;
    /**
     * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
     * @param value A JavaScript value, usually an object or array, to be converted.
     * @param replacer A function that transforms the results.
     * @param space Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
     */
    stringify(value: any, replacer?: (this: any, key: string, value: any) => any, space?: string | number): string;
    /**
     * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
     * @param value A JavaScript value, usually an object or array, to be converted.
     * @param replacer An array of strings and numbers that acts as an approved list for selecting the object properties that will be stringified.
     * @param space Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
     */
    stringify(value: any, replacer?: (number | string)[] | null, space?: string | number): string;
}

/**
 * An intrinsic object that provides functions to convert JavaScript values to and from the JavaScript Object Notation (JSON) format.
 */
declare var JSON: JSON;