/usr/lib/nodejs/es6-symbol/is-symbol.js is in node-es6-symbol 3.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | 'use strict';
module.exports = function (x) {
if (!x) return false;
if (typeof x === 'symbol') return true;
if (!x.constructor) return false;
if (x.constructor.name !== 'Symbol') return false;
return (x[x.constructor.toStringTag] === 'Symbol');
};
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