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31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
import { Dispatch } from './store'
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export interface MiddlewareAPI<D extends Dispatch = Dispatch, S = any> {
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dispatch: D
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getState(): S
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}
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/**
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* A middleware is a higher-order function that composes a dispatch function
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* to return a new dispatch function. It often turns async actions into
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* actions.
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*
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* Middleware is composable using function composition. It is useful for
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* logging actions, performing side effects like routing, or turning an
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* asynchronous API call into a series of synchronous actions.
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*
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* @template DispatchExt Extra Dispatch signature added by this middleware.
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* @template S The type of the state supported by this middleware.
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* @template D The type of Dispatch of the store where this middleware is
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* installed.
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*/
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export interface Middleware<
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_DispatchExt = {}, // TODO: see if this can be used in type definition somehow (can't be removed, as is used to get final dispatch type)
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S = any,
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D extends Dispatch = Dispatch
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> {
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(api: MiddlewareAPI<D, S>): (
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next: (action: unknown) => unknown
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) => (action: unknown) => unknown
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}
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