Handlebars module bundle (see jenkins-js-modules).

import this bundle (see jenkins-js-modules) into your application bundle (in your plugin etc) instead of bundling Handlebars in your application bundle, making your app bundle considerably lighter.

HPI Dependency

Your plugin needs to add a dependency on this plugin (to ensure it gets installed in Jenkins).

<artifactItem>
    <groupId>org.jenkins-ci.ui</groupId>
    <artifactId>handlebars</artifactId>
    <version>[VERSION]</version>
</artifactItem>

See wiki.jenkins-ci.org to get the latest version.

Using Handlebars v3:

• Bundle Id: handlebars:handlebars3

Using this bundle via the lower level import syntax (asynchronous) is not very easy because of how the Handlebarsify module interacts with the bundling process. For that reason, it is highly recommended to use the higher level require syntax (synchronous) on the handlebars NPM module, and then use a withExternalModuleMapping instruction (jenkins-js-builder) in the app bundle's gulpfile.js.

In either case, you should also add dev dependencies on the relevant Handlebars NPM packages:

npm install --save-dev jenkins-handlebars-rt hbsfy@2 handlebars@3

require (sync)

If using jenkins-js-builder to create yor application bundle, you can code your application's CommonJS modules to use the more simple CommonJS style require syntax (synch), as opposed to the lower level import syntax (async) of jenkins-js-modules.

When doing it this way, your module code should require the standard handlebars NPM module (you should really only need to access handlebars if registering helpers - Handlebarsify looks after normal templating) e.g.

var handlebars = require('handlebars');

handlebars.registerHelper(name, helper);

Note: jenkins-js-builder has special built in support for Handlebars templates.

The above code will work fine as is, but the only downside is that your app bundle will be very bloated as it will include the handlebars NPM module. To lighten your bundle for the browser (by using a shared instance of handlebars), use jenkins-js-builder to create your app bundle (in your gulpfile.js), telling it to "map" (transform) all synchronous require calls for handlebars to async imports of the handlebars:handlebars3 bundle (which actually exports handlebars) e.g.

var builder = require('jenkins-js-builder');

//
// Use the predefined tasks from jenkins-js-builder.
//
builder.defineTasks(['test', 'bundle']);

//
// Create the app bundle, mapping sync require calls for 'handlebars' to 
// async imports of 'handlebars:handlebars3'.
//
builder.bundle('src/main/js/myapp.js')
    .withExternalModuleMapping('handlebars', 'handlebars:handlebars3')
    .inDir('src/main/webapp/bundles');

All of the above "magically" translates the appropriate bits of your app bundle's JS code to use async import calls (see below) in a way that just works.