lambstaller

lambstaller allows you to run npm install --production inside of a Docker container that very closely resembles the AWS Lambda environment. This is useful for installing compiled addons locally, and then deploying to AWS.

Example

The following example copies the file '/path/to/package/to/install/package.json' to the directory '/directory/to/write/files/to/' and then runs npm install --production inside of an AWS Lambda Docker container.

'use strict';
const Lambstaller = require('lambstaller');
 
Lambstaller({
  out: '/directory/to/write/files/to/',
  pkg: '/path/to/package/to/install/package.json'
}, (err) => {
  // If all went well, err will not exist. The `out` directory will contain a
  // copy of the `pkg` package.json file, and a node_modules directory.
});

API

The function exported by lambstaller has the following specification:

• Arguments
  • options (object) - A configuration object supporting the following schema.
    • pkg (string) - The path to a package.json file. This file will be the target of npm install --production.
    • out (string) - The directory where the package.json file will be copied and the install will occur.
    • version (string) - Optional string, specifying the version of Node.js to target. Must match a version supported by Lambda. Defaults to 'nodejs4.3'.
  • callback (function) - A function which is called upon completion. This function takes the following arguments.
    • err (error) - Represents any error that occurs.
• Returns
  • Nothing

Things to be aware of

Because lambstaller runs lambci/lambda:build image in a child process, you must have Docker installed. More information about the image is available here.

The install process is reflected on your local machine by creating a volume. Therefore, Docker must have access to the local install directory. If Docker does not have access, you may see an error similar to this:

Command failed: /bin/sh -c docker run -v "/var/folders/nz/bw4sh4w15bj7_9t2546w3dgh0000gn/T/lambstaller_tests":/var/task lambci/lambda:build npm install --production
docker: Error response from daemon: Mounts denied: mac/osxfs/#namespaces for more info.
.
15bj7_9t2546w3dgh0000gn/T/lambstaller_tests
is not shared from OS X and is not known to Docker.
You can configure shared paths from Docker -> Preferences... -> File Sharing.
See https://docs.docker.com/docker-for-.