How to use the typical.isClass function in typical

return arrayify(pluginNames).map(pluginName => {
    let createPlugin
    if (typeof pluginName === 'string') {
      const loadModule = require('load-module')
      const globalModules = require('global-modules')
      createPlugin = loadModule(pluginName, {
        paths: [path.resolve(__dirname, 'plugin'), '.', globalModules],
        prefix: 'renamer-'
      })
    } else {
      createPlugin = pluginName
    }
    if (!(typeof createPlugin === 'function' && !t.isClass(createPlugin))) {
      throw new Error('Invalid plugin: plugin module must export a function')
    }
    const Plugin = createPlugin(require('./plugin-base'))
    if (!t.isClass(Plugin)) {
      throw new Error('Invalid plugin: plugin module must export a function which returns a class')
    }
    if (!Plugin.prototype.replace) {
      throw new Error('Invalid plugin: plugin class must implement a replace method')
    }
    return new Plugin()
  })
}

let createPlugin
    if (typeof pluginName === 'string') {
      const loadModule = require('load-module')
      const globalModules = require('global-modules')
      createPlugin = loadModule(pluginName, {
        paths: [path.resolve(__dirname, 'plugin'), '.', globalModules],
        prefix: 'renamer-'
      })
    } else {
      createPlugin = pluginName
    }
    if (!(typeof createPlugin === 'function' && !t.isClass(createPlugin))) {
      throw new Error('Invalid plugin: plugin module must export a function')
    }
    const Plugin = createPlugin(require('./plugin-base'))
    if (!t.isClass(Plugin)) {
      throw new Error('Invalid plugin: plugin module must export a function which returns a class')
    }
    if (!Plugin.prototype.replace) {
      throw new Error('Invalid plugin: plugin class must implement a replace method')
    }
    return new Plugin()
  })
}

expand () {
    for (const [ name, cmd ] of this) {
      if (typeof cmd === 'string') {
        const Command = require(cmd)
        this.set(name, new Command())
      } else if (t.isClass(cmd)) {
        this.set(name, new cmd())
      }
    }
  }