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Polymer App Toolbox - Starter Kit

This template is a starting point for building apps using a drawer-based
layout. The layout is provided by app-layout elements.

This template, along with the polymer-cli toolchain, also demonstrates use
of the "PRPL pattern" This pattern allows fast first delivery and interaction with
the content at the initial route requested by the user, along with fast subsequent
navigation by pre-caching the remaining components required by the app and
progressively loading them on-demand as the user navigates through the app.

The PRPL pattern, in a nutshell:

  • Push components required for the initial route
  • Render initial route ASAP
  • Pre-cache components for remaining routes
  • Lazy-load and progressively upgrade next routes on-demand

Migrating from Polymer Starter Kit v1?

Check out our blog post that covers what's changed in PSK2 and how to migrate!


We've recorded a Polycast to get you up and running with PSK2 fast!

<p align="center">
<a href="">
<img src="" alt="Polymer Starter Kit 2 video">



First, install Polymer CLI using
npm (we assume you have pre-installed node.js).

npm install -g polymer-cli

Second, install Bower using npm

npm install -g bower
Initialize project from template
mkdir my-app
cd my-app
polymer init starter-kit

Start the development server

This command serves the app at http://localhost:8080 and provides basic URL
routing for the app:

polymer serve --open


This command performs HTML, CSS, and JS minification on the application
dependencies, and generates a service-worker.js file with code to pre-cache the
dependencies based on the entrypoint and fragments specified in polymer.json.
The minified files are output to the build/unbundled folder, and are suitable
for serving from a HTTP/2+Push compatible server.

In addition the command also creates a fallback build/bundled folder,
generated using fragment bundling, suitable for serving from non
H2/push-compatible servers or to clients that do not support H2/Push.

polymer build

Preview the build

This command serves the minified version of the app at http://localhost:8080
in an unbundled state, as it would be served by a push-compatible server:

polymer serve build/unbundled

This command serves the minified version of the app at http://localhost:8080
generated using fragment bundling:

polymer serve build/bundled

Run tests

This command will run Web Component Tester
against the browsers currently installed on your machine:

polymer test

If running Windows you will need to set the following environment variables:


Read More here daffl/launchpad

Adding a new view

You can extend the app by adding more views that will be demand-loaded
e.g. based on the route, or to progressively render non-critical sections of the
application. Each new demand-loaded fragment should be added to the list of
fragments in the included polymer.json file. This will ensure those
components and their dependencies are added to the list of pre-cached components
and will be included in the bundled build.

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