/usr/lib/nodejs/es6-weak-map/is-weak-map.js is in node-es6-weak-map 2.0.2-1.
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 10 11 12 13 | 'use strict';
var toStringTagSymbol = require('es6-symbol').toStringTag
, toString = Object.prototype.toString
, id = '[object WeakMap]'
, Global = (typeof WeakMap === 'undefined') ? null : WeakMap;
module.exports = function (x) {
return (x && ((Global && (x instanceof Global)) ||
(toString.call(x) === id) || (x[toStringTagSymbol] === 'WeakMap'))) ||
false;
};
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