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benadamstyles/flow-utility-type-functions.js

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Flow Utility Type Functions
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flow-utility-type-functions.js
// Below are some useful Flow utility type functions, some I've written and some I've found on the web.
// All contributions welcome!
// Extracting a data type from a maybe type, e.g. getting `string` from `?string`
type _ExtractFromMaybe<T, M: ?T> = T
export type ExtractFromMaybe<M> = _ExtractFromMaybe<*, M>
// FROM https://hackernoon.com/redux-flow-type-getting-the-maximum-benefit-from-the-fewest-key-strokes-5c006c54ec87
// Extracting the type of a function's return value
type _ExtractReturn<R, F: (...args: any[]) => R> = R
export type ExtractReturn<F> = _ExtractReturn<*, F>
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