Doing some pre investigation for this feature, I found this existing structuredClone method in lib/internal/util.js

Lines 456 to 469 in 33f9b7f

    
           function structuredClone(value) { 
        
             const { 
        
               DefaultSerializer, 
        
               DefaultDeserializer, 
        
             } = require('v8'); 
        
             const ser = new DefaultSerializer(); 
        
             ser._getDataCloneError = hideStackFrames((message) => 
        
               lazyDOMException(message, 'DataCloneError')); 
        
             ser.writeValue(value); 
        
             const serialized = ser.releaseBuffer(); 
        
             const des = new DefaultDeserializer(serialized); 
        
             return des.readValue(); 
        
           }

Should I look to modify this?

It seems to only be used in lib/internal/perf/usertiming.js

node/lib/internal/perf/usertiming.js

Line 73 in 33f9b7f

structuredClone(detail) :

Additionally, two implementation questions for StructuredSerializeWithTransfer function:

How do i check for internal slots?
How do I throw a "DataCloneError" DOMException?

For each transferable of transferList:

If transferable has neither an [[ArrayBufferData]] internal slot nor a [[Detached]] internal slot, then throw a "DataCloneError" DOMException.

If transferable has an [[ArrayBufferData]] internal slot and ! IsSharedArrayBuffer(transferable) is true, then throw a "DataCloneError" DOMException.

If memory[transferable] exists, then throw a "DataCloneError" DOMException.

	function structuredClone(value) {
	const {
	DefaultSerializer,
	DefaultDeserializer,
	} = require('v8');
	const ser = new DefaultSerializer();
	ser._getDataCloneError = hideStackFrames((message) =>
	lazyDOMException(message, 'DataCloneError'));
	ser.writeValue(value);
	const serialized = ser.releaseBuffer();

	const des = new DefaultDeserializer(serialized);
	return des.readValue();
	}

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Implement globalThis.structuredClone #39713

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Implement `globalThis.structuredClone` #39713