Some useful fuctions for building FileMaker Web Viewer Widgets
You can load it directly from the unpkg cdn
//latest version
<script src="https://unpkg.com/fmw-utils" crossorigin></script>
once loaded you can find the methods on the fmwUtils global object
or if you are using a bundler like webpack, you can install from npm
npm install fmw-utils
and then import
import {fmFetch} from 'fmw-utils
fmFetch is a fetch replacement for calling a FileMaker script and gettint a promise back in return. This is probably why you are here.
FileMaker 19 only Windows will use IE 11 as the web viewer engine and therefor requiring polly filling fetch. Many app frameworks like create react app have ways to do this. You can try one like this if you don't