Like the unix
Finds the first instance of a specified executable in the PATH
environment variable. Does not cache the results, so
hash -r is not
needed when the PATH changes.
var which =// async usage// sync usage// throws if not foundvar resolved = which// if nothrow option is used, returns null if not foundresolved = which// Pass options to override the PATH and PATHEXT environment vars.
Same as the BSD
usage: which [-as] program ...
You may pass an options object as the second argument.
path: Use instead of the
pathExt: Use instead of the
all: Return all matches, instead of just the first one. Note that this means the function returns an array of strings instead of a single string.