TypeError in "initAdoptedStyleSheetObserver"

[Nick Murphy]

Context:

rrweb/packages/rrweb/src/record/observer.ts

Lines 843 to 855 in 94d408f

 const originalPropertyDescriptor = Object.getOwnPropertyDescriptor( 
   patchTarget?.prototype, 
   'adoptedStyleSheets', 
 ); 
 if ( 
   hostId === null || 
   hostId === -1 || 
   !patchTarget || 
   !originalPropertyDescriptor 
 ) 
   return () => { 
     // 
   }; 

In the lines

const originalPropertyDescriptor = Object.getOwnPropertyDescriptor(
    patchTarget?.prototype,
    'adoptedStyleSheets',
  );

patchTarget is sometimes null. This causes getOwnPropertyDescriptor to throw TypeError: Function.getOwnPropertyDescriptor: Cannot convert undefined or null to object.

I propose null checking before:

  const originalPropertyDescriptor = patchTarget?.prototype ? Object.getOwnPropertyDescriptor(
    patchTarget.prototype,
    'adoptedStyleSheets',
  ) : null;
  if (
    hostId === null ||
    hostId === -1 ||
    !patchTarget ||
    !originalPropertyDescriptor
  )
    return () => {
      //
    };