The structured clone algorithm copies complex JavaScript objects. It is used internally when invoking structuredClone()
, to transfer data between Workers via postMessage()
, storing objects with IndexedDB, or copying objects for other APIs.
It clones by recursing through the input object while maintaining a map of previously visited references, to avoid infinitely traversing cycles.
Error types
For Error
types, the error name must be one of: Error
, EvalError
, RangeError
, ReferenceError
, SyntaxError
, TypeError
, URIError
(or will be set to "Error").
Browsers must serialize the properties name
and message
, and are expected to serialize other "interesting" properties of the errors such as stack
, cause
, etc.
AggregateError
support is expected to be added to the specification in whatwg/html#5749 (and is already supported in some browsers).