/usr/lib/nodejs/es6-map/is-map.js is in node-es6-map 0.1.5-1.
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 | 'use strict';
var toStringTagSymbol = require('es6-symbol').toStringTag
, toString = Object.prototype.toString
, id = '[object Map]'
, Global = (typeof Map === 'undefined') ? null : Map;
module.exports = function (x) {
return (x && ((Global && ((x instanceof Global) || (x === Global.prototype))) ||
(toString.call(x) === id) || (x[toStringTagSymbol] === 'Map'))) || false;
};
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