Adding Typescript definition files to export Trees module. (#4718)

Signed-off-by: Lawrence Zeng <[email protected]>

runtime/JavaScript/src/antlr4/tree/Trees.d.ts

@@ -0,0 +1,15 @@
+import { Parser } from "../Parser";
+import { ParseTree } from "./ParseTree";
+import { Tree } from "./Tree";
+
+export default Trees;
+declare namespace Trees {
+    function toStringTree(tree: Tree, ruleNames: string[], recog: Parser): string;
+    function getNodeText(t: Tree, ruleNames: string[], recog: Parser): string;
+    function getChildren(t: Tree): Tree[];
+    function getAncestors(t: Tree): Tree[];
+    function findAllTokenNodes(t: ParseTree, ttype: number): ParseTree[];
+    function findAllRuleNodes(t: ParseTree, ruleIndex: number): ParseTree[];
+    function findAllNodes(t: ParseTree, index: number, findTokens: boolean): ParseTree[];
+    function descendants(t: ParseTree): ParseTree[];
+}

runtime/JavaScript/src/antlr4/tree/index.d.ts

@@ -5,4 +5,4 @@ export * from './ParseTree';
 export * from './ParseTreeListener';
 export * from './ParseTreeVisitor';
 export * from './ParseTreeWalker';
-
+export * as Trees from './Trees';