serverless-cljs-plugin

A Serverless plugin which uses lein/cljs-lambda (or, optionally Lumo) to package services written in Clojurescript.

Leiningen Template

$ lein new serverless-cljs example
example$ lein deps

Will generate an example directory containing a minimal serverless.yml and project.clj demonstrating this plugin’s functionality.

Guide to using the plugin via Lein/JVM compilation.

Usage

functions:
  echo:
    cljs: example.core/echo

plugins:
 - serverless-cljs-plugin

With the above serverless.yml, serverless deploy will create a zip file containing your functions. Doing this is similar to setting the Serverless packaging.artifact option - cljs-lambda is responsible for the zip contents, and Serverless includes/excludes will be skipped (cljs-lambda offers equivalent functionality).

In the example above, there needn’t be a corresponding entry for echo in project.clj.

Lumo

Alternatively you can use the Lumo compiler.

In order to enable it, pass the --lumo switch to either deploy or package:

$ serverless deploy --lumo

Or add the following to your serverless.yml:

custom:
  cljsCompiler: lumo

• Compiler options

  The source paths and compiler options will be read from the optional file serverless-lumo.edn. Below are the defaults:

  {:source-paths ["src"]
   :compiler     {:output-to     "out/lambda.js"
                  :output-dir    "out"
                  :source-map    false ;; because of a bug in lumo <= 1.8.0
                  :target        :nodejs
                  :optimizations :none}}
  

• Lumo Configuration

  As an alternative to cljsCompiler: lumo, cljsCompiler.lumo may be specified as a map of options. These options are passed directly to the lumo process. Currently supported:

  custom:
    cljsCompiler:
      lumo:
        dependencies:
          - andare:0.7.0
        classpath:
          - /tmp/
        localRepo: /xyz
        cache: /cache | none
        index: true | false
        exitOnWarning: true | false
  

  Note: caching is always on unless you specify “none” in the config.

• The index.js file

  The index option will materialize a custom index.js in :output-dir’s parent folder. This file should be thought as managed by serverless-cljs-plugin and it is necessary for some plugin (e.g.: serverless-offline) to work properly.

  Note: with the default compiler options, index.js will be saved in the project root, overwriting without warning.

• Exit on compilation warnings

  Lumo generates warnings such as WARNING: Use of undeclared Var to signal failures. You can tune the ones you want to see by using the :warnings compiler option in serverless-lumo.edn, but by default the lumo process emits the warnings, does not throw and returns 0. This means that serverless will keep going in presence of warnings.

License

serverless-cljs-plugin is free and unencumbered public domain software. For more information, see http://unlicense.org/ or the accompanying LICENSE file.