Function process_resolution_inputs 

pub fn process_resolution_inputs(
    environment: &[(OsString, OsString)],
) -> Result<ResolutionInputs>

What: Gather resolution inputs from the running process. std::io::Result<T> is Result<T, std::io::Error>. Why: The wrapper must know its own executable to exclude it; if the operating system cannot report it (or the current directory), resolution fails rather than risk selecting itself.

In TS you’d write (pseudocode):

function processResolutionInputs(environment: [string, string][]): ResolutionInputs;