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import merge from 'lodash.merge'
import objectPath from 'object-path'
import localforage from 'localforage'
import { throttle } from 'lodash'
const defaultReducer = (state, paths) => (
paths.length === 0 ? state : paths.reduce((substate, path) => {
objectPath.set(substate, path, objectPath.get(state, path))
return substate
}, {})
)
const defaultStorage = (() => {
return localforage
})()
const defaultSetState = (key, state, storage) => {
return storage.setItem(key, state)
}
export default function createPersistedState ({
key = 'vuex-lz',
paths = [],
getState = (key, storage) => {
let value = storage.getItem(key)
return value
},
setState = throttle(defaultSetState, 60000),
reducer = defaultReducer,
storage = defaultStorage,
subscriber = store => handler => store.subscribe(handler)
} = {}) {
return store => {
getState(key, storage).then((savedState) => {
if (typeof savedState === 'object') {
store.replaceState(
merge({}, store.state, savedState)
)
}
})
subscriber(store)((mutation, state) => {
try {
setState(key, reducer(state, paths), storage)
} catch (e) {
console.log("Couldn't persist state:")
console.log(e)
}
})
}
}
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