It appears that the repository has undergone several changes and renamings:

backend/node_modules/which/bin/node-which

@@ -1,52 +0,0 @@
-#!/usr/bin/env node
-var which = require("../")
-if (process.argv.length < 3)
-  usage()
-
-function usage () {
-  console.error('usage: which [-as] program ...')
-  process.exit(1)
-}
-
-var all = false
-var silent = false
-var dashdash = false
-var args = process.argv.slice(2).filter(function (arg) {
-  if (dashdash || !/^-/.test(arg))
-    return true
-
-  if (arg === '--') {
-    dashdash = true
-    return false
-  }
-
-  var flags = arg.substr(1).split('')
-  for (var f = 0; f < flags.length; f++) {
-    var flag = flags[f]
-    switch (flag) {
-      case 's':
-        silent = true
-        break
-      case 'a':
-        all = true
-        break
-      default:
-        console.error('which: illegal option -- ' + flag)
-        usage()
-    }
-  }
-  return false
-})
-
-process.exit(args.reduce(function (pv, current) {
-  try {
-    var f = which.sync(current, { all: all })
-    if (all)
-      f = f.join('\n')
-    if (!silent)
-      console.log(f)
-    return pv;
-  } catch (e) {
-    return 1;
-  }
-}, 0))