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import Session from '../Session.js'
export default class OakSession extends Session {  constructor(oakApp, store = null) {    super(store || null)
    oakApp.use(async (ctx, next) => {      const sid = ctx.cookies.get('sid')
      if (sid && await this.sessionExists(sid)) {        ctx.state.session = this.getSession(sid)      } else {        ctx.state.session = await this.createSession()        ctx.cookies.set('sid', ctx.state.session.id)      }
      ctx.state.session.set('_flash', {})
      await next();    })  }}