fix: satisfy pptx/xlsx typecheck

Author: alpha912

src/pptx.ts

@@ -689,7 +689,7 @@ export class PPTXConverter implements Converter {
         // Regular paragraph
         formattedContent.push({
           text: line,
-          options: { paragraph: true },
+          options: {},
         });
       }
     }
@@ -699,8 +699,10 @@ export class PPTXConverter implements Converter {
 
   private extractText(run: OSFTextRun): string {
     if (typeof run === 'string') return run;
-    if (run.type === 'link') return run.text;
-    if (run.type === 'image') return run.alt || '';
+    if (typeof run === 'object' && run !== null && 'type' in run) {
+      if (run.type === 'link') return run.text;
+      if (run.type === 'image') return run.alt || '';
+    }
     if ('text' in run && typeof run.text === 'string') return run.text;
     return '';
   }

src/xlsx.ts

@@ -471,8 +471,10 @@ export class XLSXConverter implements Converter {
 
   private extractText(run: OSFTextRun): string {
     if (typeof run === 'string') return run;
-    if (run.type === 'link') return run.text;
-    if (run.type === 'image') return run.alt || '';
+    if (typeof run === 'object' && run !== null && 'type' in run) {
+      if (run.type === 'link') return run.text;
+      if (run.type === 'image') return run.alt || '';
+    }
     if ('text' in run && typeof run.text === 'string') return run.text;
     return '';
   }