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编辑当前文件:/home/rejoandoctor/public_html/node_modules/ext/node_modules/type/map/is.js
"use strict"; var isPrototype = require("../prototype/is"); // In theory we could rely on Symbol.toStringTag directly, // still early native implementation (e.g. in FF) predated symbols var objectToString = Object.prototype.toString, objectTaggedString = objectToString.call(new Map()); module.exports = function (value) { if (!value) return false; // Sanity check (reject objects which do not expose common Promise interface) try { if (typeof value.set !== "function") return false; if (typeof value.get !== "function") return false; if (typeof value.has !== "function") return false; if (typeof value.clear !== "function") return false; } catch (error) { return false; } // Ensure its native Promise object (has [[MapData]] slot) // Note: it's not 100% precise as string tag may be overriden // and other objects could be hacked to expose it if (objectToString.call(value) !== objectTaggedString) return false; return !isPrototype(value); };