| 1 | /* @flow */
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| 2 | type ActionHandler<T> = (state: T, action: Action<{ [string]: any }>) => T;
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| 3 |
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| 4 | type ActionHandlers<T> = { [string]: ActionHandler<T> };
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| 5 |
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| 6 | export default function createReducer<T>(initialState: T, actionHandlers: ActionHandlers<T>) {
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| 7 | return (state: T = initialState, action: Action<any>): T => {
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| 8 | return actionHandlers.hasOwnProperty(action.type)
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| 9 | ? actionHandlers[action.type](state, action)
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| 10 | : state;
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| 11 | };
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| 12 | }
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