The left-hand side of an assignment expression may not be an optional property access. ts(2779)

background

Write ts and react ref when There are the following errors

It means iframeRef.current May is empty , We cannot assign values directly like this , Then we just tell the editor iframeRef.current It is OK to assign a value again

solve

• Use !., This is just ts Type inference of , When running iframeRef.curent If there is no value, it will still be thrown wrong
  
• Use condition judgment - recommend