STEP file content as bytes (avoids V8 string length limit for large files)
Statistics
Spatial containers dropped for holding nothing, counted in the merged model (a container unified across three inputs counts once). Always 0 unless MergeExportOptions.dropEmptyContainers is set.
Number of models federated as their own IfcProject because their length unit differed from the first model's. 0 means a single unified project.
File size in bytes
Number of models merged
Number of models whose length-valued data was rescaled into the first
model's unit under unitReconciliation: 'normalize'. 0 for the other
modes (or when every model already shared the first model's unit).
Total entities in the output
Human-readable advisories about the merge (empty on a clean single-unit merge). Notably flags when federation produced more than one IfcProject, which intentionally relaxes the IfcSingleProjectInstance schema rule.
Result of merged STEP export