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index.tsx
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index.tsx
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type ActionsMap<T> = {
[key: string]: (args, rootState, callback: (err: Error | null, state?: T) => void) => void
}
type EffectsMap<T> = {
[key: string]: (args, rootState) => Promise<T>
}
export default function model<T> (
defaultState: T,
actions: ActionsMap<T>
) {
const initialState = {
loading: false,
success: false,
error: '',
result: defaultState
}
type State = typeof initialState
const effects: EffectsMap<T> = {}
for (let key in actions) {
const f = actions[key]
effects[key] = function (args, rootState) {
const self = this as any
return new Promise((resolve, reject) => {
self.start()
f(args, rootState, (err, result) => {
if (err) {
self.end(err)
return reject(err)
}
self.end(null, result)
resolve(result)
})
})
}
}
return {
state: initialState,
effects,
reducers: {
start (state: State): State {
return {
...state,
loading: true,
success: false,
error: ''
}
},
end (state: State, err: Error | null, result?: T): State {
return {
...state,
loading: false,
success: err ? false : true,
error: err ? err.message : '',
result: result || defaultState
}
},
clear (state: State): State {
return initialState
},
reset (state: State): State {
return {
...state,
loading: false,
success: false,
error: ''
}
}
}
}
}