{"version":3,"file":"useStateMachine.js","sources":["../../src/shared/useStateMachine.ts"],"sourcesContent":["import type { Ref } from 'vue'\nimport { ref } from 'vue'\n\ninterface Machine<S> {\n  [k: string]: { [k: string]: S }\n}\ntype MachineState<T> = keyof T\ntype MachineEvent<T> = keyof UnionToIntersection<T[keyof T]>\n\n// 🤯 https://fettblog.eu/typescript-union-to-intersection/\ntype UnionToIntersection<T> = (T extends any ? (x: T) => any : never) extends (\n  x: infer R\n) => any\n  ? R\n  : never\n\n/**\n * The `useStateMachine` function is a TypeScript function that creates a state machine and returns the\n * current state and a dispatch function to update the state based on events.\n * @param initialState - The `initialState` parameter is the initial state of the state machine. It\n * represents the starting point of the state machine's state.\n * @param machine - The `machine` parameter is an object that represents a state machine. It should\n * have keys that correspond to the possible states of the machine, and the values should be objects\n * that represent the possible events and their corresponding next states.\n * @returns The `useStateMachine` function returns an object with two properties: `state` and\n * `dispatch`.\n */\nexport function useStateMachine<M>(\n  initialState: MachineState<M>,\n  machine: M & Machine<MachineState<M>>,\n) {\n  const state = ref(initialState) as Ref<MachineState<M>>\n\n  function reducer(event: MachineEvent<M>) {\n    // @ts-expect-error  state.value is keyof M\n    const nextState = machine[state.value][event]\n    return nextState ?? state.value\n  }\n\n  const dispatch = (event: MachineEvent<M>) => {\n    state.value = reducer(event)\n  }\n\n  return {\n    state,\n    dispatch,\n  }\n}\n"],"names":[],"mappings":";;AA2BgB,SAAA,eAAA,CACd,cACA,OACA,EAAA;AACA,EAAM,MAAA,KAAA,GAAQ,IAAI,YAAY,CAAA;AAE9B,EAAA,SAAS,QAAQ,KAAwB,EAAA;AAEvC,IAAA,MAAM,SAAY,GAAA,OAAA,CAAQ,KAAM,CAAA,KAAK,EAAE,KAAK,CAAA;AAC5C,IAAA,OAAO,aAAa,KAAM,CAAA,KAAA;AAAA;AAG5B,EAAM,MAAA,QAAA,GAAW,CAAC,KAA2B,KAAA;AAC3C,IAAM,KAAA,CAAA,KAAA,GAAQ,QAAQ,KAAK,CAAA;AAAA,GAC7B;AAEA,EAAO,OAAA;AAAA,IACL,KAAA;AAAA,IACA;AAAA,GACF;AACF;;;;"}