source: frontend/node_modules/es-abstract/2016/IsPromise.js

'use strict';

var callBound = require('call-bound');

var $PromiseThen = callBound('Promise.prototype.then', true);

var isObject = require('es-object-atoms/isObject');

// https://262.ecma-international.org/6.0/#sec-ispromise

module.exports = function IsPromise(x) {
        if (!isObject(x)) {
                return false;
        }
        if (!$PromiseThen) { // Promises are not supported
                return false;
        }
        try {
                $PromiseThen(x); // throws if not a promise
        } catch (e) {
                return false;
        }
        return true;
};