This file is indexed.

/usr/lib/nodejs/promise/lib/done.js is in node-promise 8.0.1-1.

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The actual contents of the file can be viewed below.

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'use strict';

var Promise = require('./core.js');

module.exports = Promise;
Promise.prototype.done = function (onFulfilled, onRejected) {
  var self = arguments.length ? this.then.apply(this, arguments) : this;
  self.then(null, function (err) {
    setTimeout(function () {
      throw err;
    }, 0);
  });
};