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31 lines
1.6 KiB
TypeScript
31 lines
1.6 KiB
TypeScript
import { Observable } from "rxjs";
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import { StateUpdateOptions } from "./state-update-options";
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/**
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* A helper object for interacting with state that is scoped to a specific domain
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* but is not scoped to a user. This is application wide storage.
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*/
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export interface GlobalState<T> {
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/**
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* Method for allowing you to manipulate state in an additive way.
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* @param configureState callback for how you want to manipulate this section of state
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* @param options Defaults given by @see {module:state-update-options#DEFAULT_OPTIONS}
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* @param options.shouldUpdate A callback for determining if you want to update state. Defaults to () => true
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* @param options.combineLatestWith An observable that you want to combine with the current state for callbacks. Defaults to null
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* @param options.msTimeout A timeout for how long you are willing to wait for a `combineLatestWith` option to complete. Defaults to 1000ms. Only applies if `combineLatestWith` is set.
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* @returns A promise that must be awaited before your next action to ensure the update has been written to state.
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* Resolves to the new state. If `shouldUpdate` returns false, the promise will resolve to the current state.
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*/
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update: <TCombine>(
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configureState: (state: T | null, dependency: TCombine) => T | null,
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options?: Partial<StateUpdateOptions<T, TCombine>>,
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) => Promise<T | null>;
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/**
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* An observable stream of this state, the first emission of this will be the current state on disk
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* and subsequent updates will be from an update to that state.
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*/
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state$: Observable<T | null>;
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}
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