Google Closure Compiler builder

This is a tool builder to invoke Google Closure Compiler commands. Google Closure Compiler has Java and JavaScript implementations. This builder uses the Java.

Arguments passed to this builder will be passed to google-closure-compiler directly.

The latest available version of google-closure-compiler is used.

Examples

The following example demonstrates using this builder:

Generate Closure Compiled code

This cloudbuild.yaml uses this builder to convert to convert the "Hello World" function used in the Google Closure Compiler documentation. For convenience, the optimized JavaScript is output to the Cloud Builder logs using busybox more and not persisted outside of the build.

// ==ClosureCompiler==
// @compilation_level SIMPLE_OPTIMIZATIONS
// @output_file_name default.js
// ==/ClosureCompiler==

// ADD YOUR CODE HERE
function hello(name) {
  alert('Hello, ' + name);
}
hello('New user');

cloudbuild.yaml:

steps:
# Use the wget builder to retrieve the helloworld.js file from the GitHub repo
- name: gcr.io/cloud-builders/wget
  args: [
    "--output-document", "helloworld.js",
    "https://raw.githubusercontent.com/DazWilkin/cloud-builders-google-closure-compiler/master/google-closure-compiler/examples/helloworld.js"
  ]
# Apply Google Closure Compiler to helloworld.js producing an optimized helloworld.out.js
- name: gcr.io/${PROJECT_ID}/google-closure-compiler
  args: [
    "--js_output_file=helloworld.out.js",
    "helloworld.js"
  ]
# Use busybox to 'more' the helloworld.out.js to the Cloud Builder logs
- name: busybox
  args: [
    "more", "helloworld.out.js"
  ]

Using the Google Closure Compiler builder

This Google Closure Compiler builder takes a single input file runs the file through the Google Closure Compiler and produces optimized JavaScript output. Your `cloudbuild.yaml' needs to provide access to the input file and preserve generated JavaScript output.

Typically, you may do this by triggering the Google Closure Compiler builder from a repository change. Triggers copy the repository contents to Cloud Builders "/workspace" directory from where you may reference them. You may wish to commit optimized JavaScript files back to the repository or elsewhere.

This builder could be used as a way to optimize JavaScript code destined for deployment to Google Cloud Functions