Function is_executable 

pub fn is_executable(metadata: &Metadata) -> bool

What: Report whether file metadata says the file can be run. #[cfg(unix)] and #[cfg(not(unix))] each compile one of the two inner blocks. Why: PATH lookup only runs executable files; a non-executable git is skipped. On Unix this checks the mode bits, not the calling user’s access as access(2) would. Other systems have no execute bit: every regular file named by PATHEXT can run. The Markdown policy’s linter lookup applies the same test.

In TS you’d write (pseudocode):

function isExecutable(stats: Stats): boolean { return process.platform === 'win32' || (stats.mode & 0o111) !== 0; }