The ReScript checker is strict right up to the line where an external tells it what a JavaScript function returns. After that it believes you. Bind getItem as returning string and every caller treats the result as a string, though the browser hands back null for a missing key. The honest binding returns Nullable.t<string> and converts to option once, where the value comes in. What I can't decide is how much to wrap beyond that.
getItem, null and ReScript externals
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