TS bugfix, export top-level indexer

`export default` will export like `module.exports["default"] = cptable`

Author: karikera

types/index.d.ts

@@ -1,39 +1,43 @@
 /* codepage.js (C) 2013-present SheetJS -- http://sheetjs.com */
 // TypeScript Version: 2.2
 
-/** Codepage index type (integer or string representation) */
-export type CP$Index = number | string;
+declare namespace cptable {
+	/** Codepage index type (integer or string representation) */
+	export type CP$Index = number | string;
+
+	/* Individual codepage converter */
+	export interface CP$Conv {
+		enc: {[n: string]: number; };
+		dec: {[n: number]: string; };
+	}
+
+	/** Encode input type (string, array of characters, Buffer) */
+	export type CP$String = string | string[] | Uint8Array;
+
+	/** Encode output / decode input type */
+	export type CP$Data = string | number[] | Uint8Array;
+
+	/** General utilities */
+	export interface CP$Utils {
+		decode(cp: CP$Index, data: CP$Data): string;
+		encode(cp: CP$Index, data: CP$String, opts?: any): CP$Data;
+		hascp(n: number): boolean;
+		magic: {[cp: string]: string};
+	}
 
-/* Individual codepage converter */
-export interface CP$Conv {
-	enc: {[n: string]: number; };
-	dec: {[n: number]: string; };
 }
 
-/** Encode input type (string, array of characters, Buffer) */
-export type CP$String = string | string[] | Uint8Array;
-
-/** Encode output / decode input type */
-export type CP$Data = string | number[] | Uint8Array;
-
-/** General utilities */
-export interface CP$Utils {
-	decode(cp: CP$Index, data: CP$Data): string;
-	encode(cp: CP$Index, data: CP$String, opts?: any): CP$Data;
-	hascp(n: number): boolean;
-	magic: {[cp: string]: string};
-}
-
-/* note: TS cannot export top-level indexer, hence default workaround */
-export interface CP$Module {
+interface CP$Module {
 	/** Version string */
 	version: string;
 
 	/** Utility Functions */
-	utils: CP$Utils;
+	utils: cptable.CP$Utils;
 
 	/** Codepage Converters */
-	[cp: number]: CP$Conv;
+	[cp: number]: cptable.CP$Conv;
 }
-export const cptable: CP$Module;
-export default cptable;
+
+declare const cptable:CP$Module;
+
+export = cptable;