SplitBackendUpdate splits a large VDomBackendUpdate into multiple smaller updates The first update contains all the core fields, while subsequent updates only contain array elements that need to be appended.

Size for subsequent chunks.

Size for initial chunks that contain both TransferElems and StateSync.

generic hook structure.

used in props.

vdom element.

used in props.

matches WaveKeyboardEvent.

used in props.

target -- to support new targets in the future, like toolbars, partial blocks, splits, etc.

the over the wire format for a vdom element.