This file is indexed.

/usr/lib/nodejs/es6-set/valid-set.js is in node-es6-set 0.1.5-1.

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The actual contents of the file can be viewed below.

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'use strict';

var isSet = require('./is-set');

module.exports = function (x) {
	if (!isSet(x)) throw new TypeError(x + " is not a Set");
	return x;
};