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/**
 * Module exports.
 */

module.exports = on;

/**
 * Helper for subscriptions.
 *
 * @param {Object|EventEmitter} obj with `Emitter` mixin or `EventEmitter`
 * @param {String} event name
 * @param {Function} callback
 * @api public
 */

function on (obj, ev, fn) {
  obj.on(ev, fn);
  return {
    destroy: function () {
      obj.removeListener(ev, fn);
    }
  };
}