Polyfilling Fetch and Promises

For a new project I’m working on, I’ve chosen Preact to handle the frontend. Preact is a Fast 3kB alternative to React with the same ES6 API. So far I’m very happy with choosing Preact but that’s a story for a different blog post. Having never worked with ES6 before, choosing Preact also introduced me to cool new functions/concepts like fetch() and Promise. But web development wouldn’t be web development without browser support issues now would it?
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