ChromeでJavaScriptからIndexedDbを初期化する

webkitGetDatabaseNames()呼んでるせいでChromeでしか動かないんだけど、呼びたいのはどうせ開発中だけだし、そのうちgetDatabaseNames() が生えるようになるとは思うので、それまで我慢して。

resetStorages = do ->
  getDbNames = -> new Promise (done, reject) ->
    req = indexedDB.webkitGetDatabaseNames()
    req.addEventListener 'success', (event) ->
      dbNames = (i for i in event.target.result)
      done(dbNames)
    req.addEventListener 'error', (event) ->
      reject()

  removeAllIndexedDb = (dbNames) ->
    Promise.all(
      dbNames.map (name) -> new Promise (done, reject) ->
        req = indexedDB.deleteDatabase(name)
        req.addEventListener 'success', ->
          done()
        req.addEventListener 'error', ->
          reject()
    )

  resetAllIndexedDb = -> new Promise (done) ->
    getDbNames().then (names) ->
      removeAllIndexedDb(names).then ->
        console.info 'all items removed!'
        done()

  ->
    localStorage.clear()
    resetAllIndexedDb()