pub unsafe fn js_unbox<T>(v: Value) -> Option<T>Expand description
Unboxes a value created by js_box, returning the original object.
Returns Some(v) if the unboxing succeeded, or None if the value was not a valid box object
or it was already unboxed.
This mutates the object, so that calling js_unbox on the same object will return None.
§Safety
Assumes that the object has been untouched since being returned from js_box or js_box_from_std_box,
and that the type argument is the same as the one used to box it.
JS or Rust code could modify the object or construct a JS object with an invalid internal pointer, which this function can’t check for. In such a case, the result is undefined.
If the value is sent across a thread, the caller needs to ensure that T implements Send
(TODO: is this even possible with wasm?).
The lifetime of T must still be valid. If in doubt, require 'static.