Allow data function to return a promise
#611
Open
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Fixes #314.
If the
datafunction returns aPromiseor other thenable, the suggestions are updated when the promise resolves.The type definitions already have
Promiseas a valid return type forDataFunc, so this PR brings the actual functionality in line with what you would expect from the types.I added tests for both types of async data functions, callback-based and promise-based.
I have the Prettier extension enabled and it made some formatting changes. If necessary, I can disable the extension and remake my changes so the diff is as small as possible.