Optionalstep: string | ArrayBuffer | Uint8Array<ArrayBufferLike>Optionalname: stringOptionalseed: stringOptionalfolder: stringOptionalunit: unitOfLengthEnumThe STEP file, as text or bytes.
OptionalnameThe file's name, which names the shapes file, a lone part or assembly the file leaves unnamed, and the assembly that places shapes the file holds side by side.
OptionalseedText mixed into the documents' ids: the same file and seed give the same ids, so a second import replaces the first; another seed makes a copy.
OptionalfolderThe folder of the shapes file's uri, relative to the documents, such as assets; empty
keeps the file beside them.
OptionalunitThe unit the documents are in: the shapes and the placements are scaled from the file's own unit into it.
A STEP file, its name, the seed of the ids and the folder of the shapes file, for
design.fromStep, which turns the file into design documents.