How to use the launch-editor-middleware function in launch-editor-middleware

this.useMiddleware(async (req, res, next) => {
        if (this.webpackDevMiddleware) {
          await this.webpackDevMiddleware(req, res)
        }
        if (this.webpackHotMiddleware) {
          await this.webpackHotMiddleware(req, res)
        }
        next()
      })
    }

    // open in editor for debug mode only
    if (this.options.debug && this.options.dev) {
      this.useMiddleware({
        path: '__open-in-editor',
        handler: launchMiddleware(this.options.editor)
      })
    }

    // For serving static/ files to /
    const staticMiddleware = serveStatic(
      path.resolve(this.options.srcDir, this.options.dir.static),
      this.options.render.static
    )
    staticMiddleware.prefix = this.options.render.static.prefix
    this.useMiddleware(staticMiddleware)

    // Serve .nuxt/dist/ files only for production
    // For dev they will be served with devMiddleware
    if (!this.options.dev) {
      const distDir = path.resolve(this.options.buildDir, 'dist')
      this.useMiddleware({

}

    // Dev middleware
    if (this.options.dev) {
      this.useMiddleware((req, res, next) => {
        if (!this.devMiddleware) {
          return next()
        }
        this.devMiddleware(req, res, next)
      })

      // open in editor for debug mode only
      if (this.options.debug) {
        this.useMiddleware({
          path: '__open-in-editor',
          handler: launchMiddleware(this.options.editor)
        })
      }
    }

    // Add user provided middleware
    for (const m of this.options.serverMiddleware) {
      this.useMiddleware(m)
    }

    // Graceful 404 error handler
    const { fallback } = this.options.render
    if (fallback) {
      // Dist files
      if (fallback.dist) {
        this.useMiddleware({
          path: this.publicPath,

this.useMiddleware(async (req, res, next) => {
        if (this.webpackDevMiddleware) {
          await this.webpackDevMiddleware(req, res)
        }
        if (this.webpackHotMiddleware) {
          await this.webpackHotMiddleware(req, res)
        }
        next()
      })
    }

    // open in editor for debug mode only
    if (this.options.debug && this.options.dev) {
      this.useMiddleware({
        path: '__open-in-editor',
        handler: launchMiddleware(this.options.editor)
      })
    }

    // For serving static/ files to /
    const staticMiddleware = serveStatic(
      path.resolve(this.options.srcDir, this.options.dir.static),
      this.options.render.static
    )
    staticMiddleware.prefix = this.options.render.static.prefix
    this.useMiddleware(staticMiddleware)

    // Serve .nuxt/dist/ files only for production
    // For dev they will be served with devMiddleware
    if (!this.options.dev) {
      const distDir = path.resolve(this.options.buildDir, 'dist', 'client')
      this.useMiddleware({