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const EventEmitter = require('events')
const IDB = require('idb-global')
const KEY = 'metamask-test-config'
module.exports = class Helper extends EventEmitter {
tryToCleanContext () {
this.unregister()
.then(() => this.clearDb())
.then(() => super.emit('complete'))
.catch((err) => {
if (err) {
super.emit('complete')
}
})
}
unregister () {
return global.navigator.serviceWorker.getRegistration()
.then((registration) => {
if (registration) {
return registration.unregister()
.then((b) => b ? Promise.resolve() : Promise.reject())
} else return Promise.resolve()
})
}
clearDb () {
return new Promise((resolve, reject) => {
const deleteRequest = global.indexDB.deleteDatabase(KEY)
deleteRequest.addEventListener('success', resolve)
deleteRequest.addEventListener('error', reject)
})
}
mockState (state) {
const db = new IDB({
version: 2,
key: KEY,
initialState: state,
})
return db.open()
}
}
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