Fix typescript export declaration

Author: Clement Petit

types/index.d.ts

@@ -1,32 +1,35 @@
 // TypeScript Version: 3.0
 
 export interface ASTNode {
- type: 'root' | 'bracket';
- nodes: ASTNode[];
- stash: string[];
+type: 'root' | 'bracket';
+nodes: ASTNode[];
+stash: string[];
 }
 
 export interface State {
- input: string;
- separator: string;
- stack: ASTNode[];
- bos(): boolean;
- eos(): boolean;
- prev(): string;
- next(): string;
+input: string;
+separator: string;
+stack: ASTNode[];
+bos(): boolean;
+eos(): boolean;
+prev(): string;
+next(): string;
 }
 
 export interface Options {
- brackets?: { [key: string]: string } | boolean;
- quotes?: string[] | boolean;
- separator?: string;
- strict?: boolean;
- keep?(value: string, state: State): boolean;
+brackets?: { [key: string]: string } | boolean;
+quotes?: string[] | boolean;
+separator?: string;
+strict?: boolean;
+keep?(value: string, state: State): boolean;
 }
 
-type SplitFunc = (state: State) => boolean;
+export type SplitFunc = (state: State) => boolean;
 
-declare function split(input: string, options?: Options | SplitFunc): string[];
-declare function split(input: string, options: Options, fn: SplitFunc): string[];
+declare module 'split-string' {
 
-export default split;
+declare function split(input: string, options?: Options | SplitFunc): string[];
+declare function split(input: string, options: Options, fn: SplitFunc): string[];
+
+export = split;
+}