IE11 - 'Promise' is undefined

[theonesuperdave]

I have the LD client running perfectly in my SPA, except that Internet Explorer 11 doesn't like the ES6 Promise usage which is unsupported. Promise is still being used in the ldclient.min.js file; everything works fine in Chrome and Edge browsers.

[object Error]{description: "'Promise' i...", innerError: undefined, message: "'Promise' i...", name: "ReferenceEr...", number: -2146823279, stack: "ReferenceEr..."}

Looks like it's complaining about EventSender.js (54,9) but I found Promise used in other modules as well.

After looking at the docs, I wasn't able to find any guidance for this one, so please advise when you can.

[apucacao]

Hi @theonesuperdave,

We currently recommend using a polyfill like es6-promise to support Promise in older browsers.

Apologies for the lack of guidance there — we're going to update the README and docs now.

[theonesuperdave]

OK. Thanks, @apucacao. I'm already looking at that polyfill now. I noticed other non-compliant IE11 items (const, for example) were removed from the minified file, and thought maybe I had missed something in the docs..