fix: type errors

Author: amir78729

package.json

@@ -2,7 +2,7 @@
   "name": "cemnama",
   "description": "a Custom Element Manifest Viewer component developed in web components",
   "author": "Amirhossein Alibakhshi",
-  "version": "0.0.0-alpha-2",
+  "version": "0.0.0-alpha-3",
   "repository": {
     "type": "git",
     "url": "https://github.com/amir78729/custom-element-manifest-viewer.git"

src/custom-element-manifest-viewer/custom-element-manifest-viewer.ts

@@ -180,10 +180,11 @@ export class CustomElementManifestViewer extends LitElement {
                     ? removeBackticks(property.type.text)
                     : 'string',
                   description: property?.description,
+                  // @ts-expect-error
                   defaultValue:
                     (property?.default &&
                       removeBackticks(removeQuotes(property.default))) ||
-                    this.propertyKnobs[property.name],
+                    this.propertyKnobs?.[property.name],
                   // @ts-expect-error
                   onChange: (e: Event) => {
                     const input = e.target as HTMLInputElement;