Make Promise requireable

[andrewdeandrade]

Like issue #157, make Promise requirable. It's not a reserved ES6 keyword, so it would be nice to be able to not have to use it as a global (just like you can require('process'), require('buffer'), require('timers') and require('console').

(cc: @lxe @Raynos)

[kyriosli]

I thought `Promise' was introduced in ES6, as a global field just like String, RegExp, Date, etc

[vkurchatkin]

Promise is defined by ES specification as a property of the global object. Scripts using require('promise') instead of Promise would become less portable for no good reason. Also there is already promise package on npm.

[Willyham]

Seems to go against #157 which was merged. The same sentiment also applies for all es6 globals (Promise, Symbol, Map, Set, WeakMap, WeakSet, Proxy, Reflect) and I guess also things like 'Date' and 'Math'.

Can we at least be consistent with the way globals are handled?

[bnoordhuis]

@Willyham The difference is that process is an io.js special. Promise and the others you mention are standardized.

[andrewdeandrade]

In hindsight, we should be able to get this via globals

https://www.npmjs.com/package/globals

var Promise = require('globals').Promise;

[timoxley]

I don't really understand the usecase of this. Are you also keen on requiring other built-ins String, Number, Math, etc?