This file is indexed.

/usr/lib/nodejs/arr-diff/index.js is in node-arr-diff 3.0.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/*!
 * arr-diff <https://github.com/jonschlinkert/arr-diff>
 *
 * Copyright (c) 2014-2016, Jon Schlinkert.
 * Licensed under the MIT License
 */

'use strict';

var flatten = require('arr-flatten');
var slice = [].slice;

module.exports = function(arr, arrays) {
  arrays = flatten(slice.call(arguments, 1));
  var len = arrays.length;
  for (var i = 0; i < len; i++) {
    remove(arr, arrays[i]);
  }
  return arr;
};

function remove(arr, ele) {
  var idx = arr.indexOf(ele);
  while (idx !== -1) {
    arr.splice(idx, 1);
    idx = arr.indexOf(ele);
  }
}