TLExcalidrawExternalContent

A drawing exported from Excalidraw.

Only the *data shape* is declared here. Reading it — mapping Excalidraw's element model onto canvas shapes — is deliberately not implemented: it is an import path for another vendor's format, and it is listed as out of scope. The type exists so a host that wants that import can register a handler for it against the same registry as everything else, and so TLExternalContentSource can name the case where a paste turns out to be an Excalidraw clipboard.