MDN says that "Function objects cannot be duplicated by the structured clone algorithm; attempting to throws a DataCloneError exception."
Why does copying a function object emit an error with structuredClone()?
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What are you looking for? Probably the only answer you can get is "That's just how JavaScript works" with a reference to the ECMAScript spec.Samathingamajig– Samathingamajig2022-05-04 15:06:03 +00:00Commented May 4, 2022 at 15:06
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@Samathingamajig I want to know what potential problems are there when copying a function. I believe that there is a clear reason why structured clones do not copy functions.Byeongin Yoon– Byeongin Yoon2022-05-04 15:09:57 +00:00Commented May 4, 2022 at 15:09
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1 Answer
If you read on MDN/structuredClone, it says
Exceptions
DataCloneErrorDOMException
- Thrown if any part of the input value is not serializable.
For why functions are not serializable, see here: Why is a function not serializable?
From what I understand of those answers, the TL;DR is that it's because a function can be converted to a string, but the variables/functions referenced in the function that are out of scope would cause issues.
