Is it required to include both scripts in html page?

[dehghani-mehdi]

<!-- Automatically provides/replaces `Promise` if missing or broken. -->
<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.js"></script>
<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.auto.js"></script> 

<!-- Minified version of `es6-promise-auto` below. -->
<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.auto.min.js"></script> 

• What is different between es6-promise.js and es6-promise.auto.js?
• Is it required to include both scripts in html page?
• What happens if just include either of es6-promise.js or es6-promise.auto.js?

[yairEO]

I also don't understand from the README what is the difference. very poor explanation:

Automatically provides/replaces Promise if missing or broken.

That is the whole essence of a polyfill...of course this is what it does, question is what does "auto" means...since every polyfill is obviously "auto" and only applies if internally detected it should apply.

[danielocdh]

What I found out testing a jsPDF page with IE and looking at the code:

• es6-promise.auto.js seems to work like any polyfill so promises can be used automatically by scripts that require it, I guess with es6-promise.j you can only use the script implementation manually.
• including es6-promise.auto.js seems to be enough, including both shouldn't cause trouble.
• I would only use es6-promise.auto.js, if you need the polyfill that will do it. If you want to manually use the script implementation with either version of the script you can use ES6Promise