| 1 | const createStoreImpl = (createState) => {
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| 2 | let state;
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| 3 | const listeners = new Set();
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| 4 | const setState = (partial, replace) => {
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| 5 | const nextState = typeof partial === "function" ? partial(state) : partial;
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| 6 | if (!Object.is(nextState, state)) {
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| 7 | const previousState = state;
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| 8 | state = (replace != null ? replace : typeof nextState !== "object" || nextState === null) ? nextState : Object.assign({}, state, nextState);
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| 9 | listeners.forEach((listener) => listener(state, previousState));
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| 10 | }
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| 11 | };
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| 12 | const getState = () => state;
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| 13 | const getInitialState = () => initialState;
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| 14 | const subscribe = (listener) => {
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| 15 | listeners.add(listener);
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| 16 | return () => listeners.delete(listener);
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| 17 | };
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| 18 | const api = { setState, getState, getInitialState, subscribe };
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| 19 | const initialState = state = createState(setState, getState, api);
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| 20 | return api;
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| 21 | };
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| 22 | const createStore = (createState) => createState ? createStoreImpl(createState) : createStoreImpl;
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| 23 |
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| 24 | export { createStore };
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