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settings.ts
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/
settings.ts
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import * as State from './state'
import {
createAppDatabase,
ensureAppPreferences,
updateAppPreferences,
AppDatabase,
} from './db'
export function createSettingsMiddleware(): State.Middleware {
let database: AppDatabase | undefined
return store => {
const {dispatch} = store
createAppDatabase().then(db => {
database = db
dispatch(State.fetchAppPreferences())
})
return next => action => {
if (database) {
const db: AppDatabase = database
switch (action.type) {
case State.FETCH_APP_PREFERENCES: {
ensureAppPreferences(db).then(prefs =>
dispatch(State.appPreferences(prefs))
)
break
}
case State.UPDATE_APP_PREFERENCES: {
updateAppPreferences(db, action.payload)
.then(() => ensureAppPreferences(db))
.then(prefs => dispatch(State.appPreferences(prefs)))
break
}
}
}
return next(action)
}
}
}