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allthesignals/mocking-mapbox-gl-tiles.md

Created January 17, 2020 23:15
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mocking-mapbox-gl-tiles.md

Goal

I'd like to mock the requests for tiles made by MapboxGL using Pretender.

Problem

Pretender doesn't intercept those requests

What I've discovered

I think MapboxGL uses service workers. I'm not sure because I can't see them in the Chrome inspector, even on production sites. When I log the XMLHttpRequest global — which PretenderJS is responsible for replacing with a FakeRequest object — it always appears to be the native code.

I think this has to do with how the service worker scope works. It seems like its own fetch interface isn't being replaced by Pretender.

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