Natively Pronounced Mandarin


    1.2.2 • Public • Published

    serverless-bundle Build Status npm

    An extension of the serverless-webpack plugin. This plugin bundles your Node.js Lambda functions with sensible defaults so you don't have to maintain your own Webpack configs.

    • Linting via ESLint
    • Caching for faster builds
    • Use ES6 import/export
    • Supports transpiling unit tests with babel-jest
    • Source map support for proper error messages

    And all this works without having to install Webpack, Babel, ESLint, etc. or manage any of their configs. Simply add serverless-bundle to your app and you are done!

    -    "eslint"
    -    "webpack"
    -    "@babel/core"
    -    "babel-eslint"
    -    "babel-loader"
    -    "eslint-loader"
    -    "@babel/runtime"
    -    "@babel/preset-env"
    -    "serverless-webpack"
    -    "source-map-support"
    -    "webpack-node-externals"
    -    "eslint-config-strongloop"
    -    "@babel/plugin-transform-runtime"
    -    "babel-plugin-source-map-support"
    +    "serverless-bundle"

    You can read more about this over on Serverless Stack.

    Getting Started

    Install the serverless-bundle plugin using:

    $ npm install --save-dev serverless-bundle

    Then add it to your serverless.yml.

      - serverless-bundle

    To run your tests using the same Babel config used in the plugin add the following to your package.json:

    "scripts": {
      "test": "serverless-bundle test"


    Once installed and added to your serverless.yml, serverless-bundle will automatically package your functions using Webpack when you run the various serverless commands.


    You can configure the following through your serverless.yml.

        sourcemaps: true          # Enable source maps
        caching: true             # Enable Webpack caching
        stats: false              # Don't print out any Webpack output
        linting: true             # Enable linting as a part of the build process
        forceInclude:             # Optional list of NPM packages that need to be included
          - mysql                   # Only necessary if packages are included dynamically
        ignorePackages:           # Ignore building any of the following packages
          - hiredis                 # For ex, hiredis needs to be ignored if using redis
        copyFiles:                # Copy any additional files to the generated package
          - from: 'public/*'        # Where the files are currently
            to: './'                # Where in the package should they go
        packager: npm             # Specify a packager, 'npm' or 'yarn'. Defaults to 'npm'.
        packagerOptions:          # Run a custom script in the package process
          scripts:                  #
            - echo hello > test

    Advanced Options

    • ESLint

      This plugin uses eslint-config-strongloop. You can override this by placing your own .eslintrc.json with the rules you'd like to use. If you'd like to ignore specific files, you can use a .eslintignore file.

    • Customizing Babel and Webpack configs

      This plugin does not support customizing the Babel and Webpack configs, since serverless-webpack does a pretty good job with that. However, if you think the default config is missing some key features, feel free to open an issue about it.

    • Packager scripts

      The packagerOptions.scripts option allows serverless-webpack to run a custom script in the packaging process. This is useful for installing any platform specific binaries. See below for the sharp package.

    • Usage with WebStorm

      Here is some info on how to get this plugin to support running tests in WebStorm —

    • Alternative Jest Result Processor

      For CI services (like Atlassian Bamboo CI) that do not work with Jest test results, start by installing jest-mocha-reporter.

      To set the testResultsProcessor option, add "testResultsProcessor": "jest-mocha-reporter" to the Jest section in your package.json. You should see the default command line output when running npm run test, but you should also get a test-report.json.

      To test the reporters option, add "reporters": ["jest-mocha-reporter"] instead. This should result in the same file as above but without the command line output.

    Package Specific Config

    The packages below need some additional config to make them work.


    The knex.js module is automatically excluded from the bundle since it's not compatible with Webpack. However, you need to force include the specific database provider package since these are dynamically included. Use the forceInclude option to pass in a list of packages that you want included. For example, to include mysql use the following:

          - mysql


    The sharp package needs to include a specific binary before package. Use the packagerOptions.scripts for this.

            - rm -rf node_modules/sharp && npm install --arch=x64 --platform=linux --target=10.15.0 sharp


    The pg package optionally includes pg-native that needs to be ignored from Webpack. Use the ignorePackages option to do this.

          - pg-native


    The redis package optionally includes hiredis that needs to be ignored from Webpack. Use the ignorePackages option to do this.

          - hiredis


    To use the Sequelize package along with pg, you'll need to ignore it from Webpack and using the dialectModule option. Read more here.

    In your serverless.yml:

          - pg-native

    And in your Lambda code:

    const sequelize = new Sequelize(
        host: process.env.DB_HOST,
        dialect: process.env.DB_DIALECT,
        dialectModule: pg

    Nested Services

    It's common in Serverless monorepo setups that the plugins are installed at the root level and referenced in the individual services. Take the following project setup:

    package.json          // Here serverless-bundle is installed
      |- package.json     // Can run npm test from here, referring to parent `package.json`
      |- handler.js
      |- handler.test.js
      |- serverless.yml   // Uses serverless-bundle plugin
      |- package.json     // Can run npm test from here, referring to parent `package.json`
      |- handler.js
      |- handler.test.js
      |- serverless.yml   // Uses serverless-bundle plugin

    Running Serverless commands (deploy, package, etc.) from the services directories are supported out of the box. To get your tests to run correctly, you need to do the following.

    In the root package.json use the following test script:

    "scripts": {
      "test": "serverless-bundle test"

    And in service1/package.json use this test script:

    "scripts": {
      "test": "npm --prefix ./../ test service1"

    This tells serverless-bundle (in the root) to only run the tests inside the service1/ directory. As opposed to the entire project.


    • Open a new issue if you've found a bug or have some suggestions.
    • Or submit a pull request!

    Running Locally

    To run this project locally, clone the repo and initialize the project.

    $ git clone
    $ cd serverless-bundle
    $ npm install

    Run the tests using.

    $ npm test

    To test the serverless-bundle test command.

    $ npm run test-scripts

    To install locally in another project.

    $ npm install /path/to/serverless-bundle


    This plugin would not be possible without the amazing serverless-webpack plugin and the ideas and code from Create React App.

    This plugin is maintained by Anomaly Innovations; makers of Seed and Serverless Stack.




    npm i @dotdev/serverless-bundle

    DownloadsWeekly Downloads






    Unpacked Size

    32.8 kB

    Total Files


    Last publish


    • samuel-dotdev
    • dotdev-alex
    • adendotdev
    • p_tul
    • laure-dot-dev
    • adamdemirel
    • brendon-dotdev
    • psj
    • 8eecf0d2
    • oscarstranger
    • dotdev-bo
    • dotdev-support
    • dotdev-eric