serverless/test/fixtures/programmatic/plugin/local-esm-plugin/index.js

export default class LocalESMPlugin {
  constructor(serverless, options, utils) {
    this.serverless = serverless
    this.options = options
    this.utils = utils
    this.commands = {
      esmCustomCommand: {
        usage: 'Description of custom command',
        configDependent: false,
      },
    }
  }
}