Function parse_layout 

pub fn parse_layout(stdout: &[u8]) -> Result<LandingLocation, String>

What: Split the layout output into its three fixed lines, refusing any other shape. Why: A missing line would point the lock at the wrong directory.

In TS you’d write (pseudocode):

const [gitDir, indexPath, registryRoot] = stdout.split('\n'); if (!registryRoot) throw new TypeError(...);