37 lines
1.1 KiB
TypeScript
37 lines
1.1 KiB
TypeScript
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import { createElement, VNode } from "preact";
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export type StateFunc<S> = (p: S) => VNode;
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export type StateViewMap<StateType extends { status: string }> = {
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[S in StateType as S["status"]]: StateFunc<S>;
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};
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export type RecursiveState<S extends object> = S | (() => RecursiveState<S>);
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export function compose<SType extends { status: string }, PType>(
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hook: (p: PType) => RecursiveState<SType>,
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viewMap: StateViewMap<SType>,
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): (p: PType) => VNode {
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function withHook(stateHook: () => RecursiveState<SType>): () => VNode {
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function ComposedComponent(): VNode {
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const state = stateHook();
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if (typeof state === "function") {
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const subComponent = withHook(state);
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return createElement(subComponent, {});
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}
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const statusName = state.status as unknown as SType["status"];
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const viewComponent = viewMap[statusName] as unknown as StateFunc<SType>;
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return createElement(viewComponent, state);
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}
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return ComposedComponent;
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}
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return (p: PType) => {
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const h = withHook(() => hook(p));
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return h();
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};
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}
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