Adds typings for esprima-walk package (#10898)

esprima-walk/esprima-walk-tests.ts

@@ -0,0 +1,25 @@
+/// <reference path="../estree/estree.d.ts" />
+/// <reference path="esprima-walk.d.ts" />
+
+import * as walk from 'esprima-walk'
+
+var program: ESTree.Program
+var string: string
+var node: ESTree.Node
+
+walk(program, _node => {
+    string = node.type
+    node = _node
+})
+
+walk.walk(program, _node => {
+    string = node.type
+    node = _node
+})
+
+walk.walkAddParent(program, _node => {
+    node = _node
+    node = _node.parent
+    string = node.type
+})
+

esprima-walk/esprima-walk.d.ts

@@ -0,0 +1,40 @@
+// Type definitions for esprima-walk v0.1.0
+// Project: https://github.com/jrajav/esprima-walk
+// Definitions by: tswaters <https://github.com/tswaters>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference path="../estree/estree.d.ts" />
+
+declare module "esprima-walk" {
+
+    interface NodeWithParent extends ESTree.Node {
+        parent?: ESTree.Node
+    }
+
+    /**
+     * Walk the provided AST; fn is called once for each node with a `type`
+     * @param {ESTree.Program} ast program to walk
+     * @param {function} fn function invoked for each node with type
+     */
+    function walk (ast: ESTree.Program, fn:(node: ESTree.Node)=>void) :void
+
+    namespace walk {
+        /**
+         * Walk the provided AST; fn is called once for each node with a `type`
+         * @param {ESTree.Program} ast program to walk
+         * @param {function} fn function invoked for each node
+         */
+        export function walk (ast: ESTree.Program, fn:(node: ESTree.Node)=>void) :void
+
+        /**
+         * Walk the provided AST; fn is called once for each node with a `type`.
+         * Adds a parent property prior to invoking fn when applicable
+         * @param {ESTree.Program} ast program to walk
+         * @param {function} fn function invoked for each node
+         */
+        export function walkAddParent (ast: ESTree.Program, fn:(node: NodeWithParent)=>void) :void
+    }
+
+    export = walk
+}
+