HookPlugin.js

module exports = class SomePlugin extends ServerlessPlugin{
  
  //Contructor should be defined in ServerlessPlugin so you don't have to recreate it here
  constructor(pluginConfig, serverlessConfig, serverlessUtils) {
    this.pluginConfig = pluginConfig;
    this.serverlessConfig = serverlessConfig;
    this.serverlessUtils = serverlessUtils;
  }

  beforeDeployResources(params) {
    // do something
  }

  deployFunctions(params) {
    // do something with it
  }
}