Start Polymer Generator

Yeoman generator for Polymer projects

Start Polymer Generator is keeping up to date with Polymer Generator

Introduction

Polymer is a library of polyfills and sugar which enable the use of Web Components in modern browsers. The project allows developers to build apps using the platform of tomorrow and inform the W3C of places where in-flight specifications can be further improved.

generator-startpolymer provides Polymer scaffolding using Yeoman (a scaffolding tool for the web), letting you easily create and customize Polymer (custom) elements via the command-line and import them using HTML Imports. This saves you time writing boilerplate code so you can start writing up the logic to your components straight away.

Features

• A Polymer app scaffold built with Polymer Starter Kit Plus
• Sub-generator to create Polymer elements for your app
• Quick deploy to GitHub pages
• All the goodness of seed-element-plus (docs & landing page for your element)
• web-component-tester support

Issues

This generator clones Polymer Starter Kit Plus and seed-element-plus. If you're having issues with the template files generated for those projects, please raise them on those repos as they are the canonical source.

Installation

Install required tools yo, gulp and bower

npm install -g yo gulp bower

Install the generator

npm install -g generator-startpolymer

Run

Make a new directory and cd into it

mkdir -p my-project && cd $_

Scaffold a new Polymer project

yo startpolymer

Generators

Available generators:

• startpolymer (aka polymer:app)
• startpolymer:element
• startpolymer:seed
• startpolymer:gh

Note: Generators are to be run from the root of your app

App

Sets up a new Polymer app, generating all the boilerplate you need to get started.

Example:

yo startpolymer

Element (alias: El)

Generates a polymer element in app/elements and optionally appends an import to app/elements/elements.html.

Example:

yo startpolymer:element my-element

# or use the alias

yo startpolymer:el my-element

Note: You must pass in an element name, and the name must contain a dash "-"

One can also include element dependencies to be imported. For instance, if you're creating a fancy-menu element which needs to import paper-button and paper-checkbox as dependencies, you can generate the file like so:

yo startpolymer:el fancy-menu paper-button paper-checkbox

Options

--docs, include iron-component-page docs with your element and demo.html
--path, override default directory structure, ex: --path foo/bar will put your element in app/elements/foo/bar

Seed

Generates a reusable polymer element based on the seed-element-plus workflow. This should only be used if you're creating a standalone element repo that you intend to share with others via bower. If you're just building a Polymer app, stick to the Element generator.

To preview your new element you'll want to use the polyserve tool.

Example:

mkdir -p my-foo && cd $_
yo startpolymer:seed my-foo
polyserve

Gh

Generates a Github pages branch for your seed-element.

This requires that you have SSH keys setup on GitHub.

Windows users will need to have Git Bash installed

If your documentation or demo pages have dependencies declared as devDependencies in bower.json, they will be included in your GitHub pages branch.

Example:

cd my-foo
yo startpolymer:gh

If, for some reason, you don't want the devDependencies, use the --nodevdeps option.

Testing

The project generated by yo startpolymer contains support for web-component-tester. The following commands are included:

Run local tests (in terminal):

gulp test:local

Run remote tests with SauceLabs:

gulp test:remote

See the web-component-tester readme for configuration options.

Gotchas

The elements.html file

The app generator will produce an elements.html file where you can place your imports. This file will be vulcanized when you run the default gulp task. You'll want to make sure that elements.html is the only import in your index.html file, otherwise there's a good chance you'll accidentally load Polymer twice and break the app.

Contribute

See the contributing docs

When submitting an issue, please follow the guidelines. Especially important is to make sure Yeoman is up-to-date, and providing the command or commands that cause the issue.

License

BSD license