I think you need to include RequireJS before you include the Sweet.js files from a CDN.
There seems to be a browser-sweet.js that has a compile() function that wants a source and helpers as arguments.
I don't want to use RequireJS and I don't want to use a CDN.
Then I'd recommend you use something like Webpack, Rollup or Parcel to compile and bundle your code up for the browser.
import compile from '@sweet-js/core/dist/browser-sweet.js';
window.sweetCompile = compile;
The result will be a JS bundle that you can include on your page that will expose window.sweetCompile as a function for you to use.
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