Function validateStepInput

validateStepInput(
    input: ArrayBuffer | Uint8Array<ArrayBufferLike>,
    label?: string,
    options?: { envelope?: "complete" | "signature" },
): Promise<Uint8Array<ArrayBufferLike>>
Validate a STEP envelope and unwrap IFCZIP. Signature mode preserves recovery loaders. Never exits the process.
Parameters
- input: ArrayBuffer | Uint8Array<ArrayBufferLike>
- Optionallabel: string
- Optionaloptions: { envelope?: "complete" | "signature" }
Returns Promise<Uint8Array<ArrayBufferLike>>