fix typescript testing issue

Author: KoolADE85

@plotly/dash-generator-test-component-typescript/src/props.ts

@@ -1,6 +1,6 @@
 // Needs to export types if not in a d.ts file or if any import is present in the d.ts
 import React from 'react';
-import {DashComponent} from '@dash-renderer/types/component';
+import {DashComponent} from '@dash-renderer/types';
 
 
 type Nested = {

@plotly/dash-generator-test-component-typescript/tsconfig.json

@@ -3,6 +3,7 @@
     "jsx": "react",
     "baseUrl": "src/ts",
     "paths": {
+        "@dash-renderer/*": ["../../../../dash/dash-renderer/src/*"]
     },
     "inlineSources": true,
     "sourceMap": true,

dash/dash-renderer/src/wrapper/DashWrapper.tsx

@@ -391,7 +391,7 @@ function DashWrapper({
 
                     if (node !== undefined) {
                         if (isArray) {
-                            for (let j = 0; j < node.length; j++) {
+                            for (let j = 0; j < (node as []).length; j++) {
                                 const aPath = concat([opath], [j]);
                                 props = assocPath(
                                     aPath,