treegen: Add type definitions for parser

treegen/src/parser.d.ts

@@ -0,0 +1,24 @@
+export function parse(input:string):any;
+
+export interface Location {
+  line: number;
+  column: number;
+  offset: number;
+}
+
+interface LocationRange {
+  start: Location,
+  end: Location
+}
+
+export class SyntaxError {
+  line: number;
+  column: number;
+  offset: number;
+  location: LocationRange;
+  expected:any[];
+  found:any;
+  name:string;
+  message:string;
+}
+