Turf.min.js !!LINK!! Download

You have several ways to link a third party library to a WAB app. You can directly link the cdn to the index.html or add it in your main js widget file in the require section (think whether you want to set the library globally or locally in a widget). Now, the correct way using Dojo: go to init.js file, 'resources' var, and add the following: window.path + 'libs/turf/turf.min.js'. In my case I downloaded Turf.js. That's up to you.

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