Skip to content
Go to file

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time
Dec 11, 2015
Mar 23, 2016
Apr 11, 2016

Serverless Optimizer Plugin


Browserifies, minifies your Serverless Node.js Functions on deployment, and more!

Reducing the file size of your AWS Lambda Functions allows AWS to provision them more quickly, speeding up the response time of your Lambdas. Smaller Lambda sizes also helps you develop faster because you can upload them faster. This Severless Plugin is absolutely recommended for every project including Lambdas with Node.js.

Note: Requires Serverless v0.5.0 or higher.


  • Install via npm in the root of your Serverless Project:
npm install serverless-optimizer-plugin --save
  • Add the plugin to the plugins array in your Serverless Project's s-project.json, like this:
plugins: [
  • In the custom property of your s-function.json add an optimize property.
"custom": {
    "optimize": true
  • If you rely on the aws-sdk, be sure to read the Common Pitfalls section.

  • All done!

Configuration Options

Configuration options can be used by setting the optimize property to an object instead of a boolean value. The following options are available:

  • disable - When set to true, this will disable optimizer. This is effectively the same as setting the optimize property to false, but it does not require the deletion of any other configuration values within the optimize object. This is a good option for temporarily disabling while debugging.
"custom": {
    "optimize": {
        "disable": true
  • excludeStage - When set to a string or [string], optimizer will be disabled for the specified stage(s). This is beneficial if you do not want optimizer to run on a specific stage to aid in debugging.
"custom": {
    "optimize": {
        "excludeStage": ["dev", "test"]
  • excludeRegion - When set to a string or [string], optimizer will be disabled for the specified region(s).
"custom": {
    "optimize": {
        "excludeRegion": ["us-east-1"]

Browserify Options

Browserify options can be included as normal configuration options to the optimize object. The following options are supported:

  • handlerExt
  • includePaths
  • requires
  • plugins
  • transforms
  • exclude
  • ignore
  • extensions

For more information on these options, please visit the Browserify Documentaton.

Common Pitfalls

  • aws-sdk does not play well with Browserify. If the aws-sdk is used anywhere in your code, even if it is not within node_modules or package.json, you may receive an error similar to:

Uncaught {"errorMessage":"Cannot find module '/usr/lib/node_modules/aws-sdk/apis/metadata.json'"...

To fix this, the aws-sdk should be excluded by using the exclude Browserify option. Since the aws-sdk is always available to an AWS Lambda, it should never need to be included.

"custom": {
    "optimize": {
        "exclude": ["aws-sdk"]

ES6 with Babel and Babelify

Bundles are packaged with Browserify, and can be transformed to support ES6 features with Babelify.

Install babelify within the root context of your project:

npm install babelify --save

npm install babel-preset-es2015 --save

Add the babelify transform to s-function.json:

    "name": "myfunc",
    "runtime": "nodejs",
    "custom": {
        "optimize": {
            "exclude": [ "aws-sdk" ],
            "transforms": [
                    "name": "babelify",
                    "opts": {
                        "presets": [

We're currently working on adding support for Typescript. Check back for updates!


Serverless Optimizer Plugin: Optimizers for reducing Lambda file sizes and improving their performance -



No packages published
You can’t perform that action at this time.