lib/plugins/aws/package/index.js/AwsPackage/constructor
class AwsPackage:  constructor(serverless, options) {
    this.serverless = serverless;
    this.options = options;
    this.servicePath = this.serverless.config.servicePath || '';
    this.packagePath =
      this.options.package ||
      this.serverless.service.package.path ||
      path.join(this.servicePath || '.', '.serverless');
    this.provider = this.serverless.getProvider('aws');

    Object.assign(
      this,
      generateCoreTemplate,
      mergeIamTemplates,
      generateArtifactDirectoryName,
      mergeCustomProviderResources,
      saveServiceState,
      saveCompiledTemplate
    );

    // Define inner lifecycles
    this.commands = {
      aws: {
        type: 'entrypoint',
        commands: {
          package: {
            commands: {
              finalize: {
                lifecycleEvents: ['mergeCustomProviderResources', 'saveServiceState'],
              },
            },
          },
        },
      },
    };

    this.hooks = {
      /**
       * Outer lifecycle hooks
       */
      'package:cleanup': () =>
        BbPromise.bind(this)
          .then(() => this.serverless.pluginManager.spawn('aws:common:validate'))
          .then(() => this.serverless.pluginManager.spawn('aws:common:cleanupTempDir')),

      'package:initialize': () => BbPromise.bind(this).then(this.generateCoreTemplate),

      'package:setupProviderConfiguration': () => BbPromise.bind(this).then(this.mergeIamTemplates),

      'before:package:compileFunctions': () =>
        BbPromise.bind(this).then(this.generateArtifactDirectoryName),

      'before:package:compileLayers': () =>
        BbPromise.bind(this).then(this.generateArtifactDirectoryName),

      'package:finalize': () =>
        BbPromise.bind(this).then(() =>
          this.serverless.pluginManager.spawn('aws:package:finalize')
        ),

      /**
       * Inner lifecycle hooks
       */

      // Package finalize inner lifecycle
      'aws:package:finalize:mergeCustomProviderResources': () =>
        BbPromise.bind(this).then(this.mergeCustomProviderResources),

      'aws:package:finalize:saveServiceState': () =>
        BbPromise.bind(this)
          .then(this.saveCompiledTemplate)
          .then(this.saveServiceState)
          .then(() => this.serverless.pluginManager.spawn('aws:common:moveArtifactsToPackage')),
    };
  }