LitElement UI kit TypeScript starter

This project includes a sample component library using LitElement with TypeScript. It's based on the official LitElement TypeScript starter project. Key differences:

Multiple components
Single script for build + serve: npm run start
Single script for build + serve the documentation: npm run docs:start
Test coverage report
Component generator: npm run generate <component name>

Setup

Install dependencies:

npm i

Build

This sample uses the TypeScript compiler to produce JavaScript that runs in modern browsers.

To build the JavaScript version of your component:

npm run build

To watch files and rebuild when the files are modified, run the following command in a separate shell:

npm run build:watch

Both the TypeScript compiler and lit-analyzer are configured to be very strict. You may want to change tsconfig.json to make them less strict.

Testing

This sample uses Karma, Chai, Mocha, and the open-wc test helpers for testing. See the open-wc testing documentation for more information.

Tests can be run with the test script:

npm test

Dev Server

This sample uses open-wc's es-dev-server for previewing the project without additional build steps. ES dev server handles resolving Node-style "bare" import specifiers, which aren't supported in browsers. It also automatically transpiles JavaScript and adds polyfills to support older browsers.

To run the dev server and open the project in a new browser tab:

npm run serve

To run the dev server and watch the source file, run:

npm run start

There is a development HTML file located at /dev/index.html that you can view at http://localhost:8000/dev/index.html.

Editing

If you use VS Code, we highly reccomend the lit-plugin extension, which enables some extremely useful features for lit-html templates:

Syntax highlighting
Type-checking
Code completion
Hover-over docs
Jump to definition
Linting
Quick Fixes

The project is setup to reccomend lit-plugin to VS Code users if they don't already have it installed.

Linting

Linting of TypeScript files is provided by ESLint and TypeScript ESLint. In addition, lit-analyzer is used to type-check and lint lit-html templates with the same engine and rules as lit-plugin.

The rules are mostly the recommended rules from each project, but some have been turned off to make LitElement usage easier. The recommended rules are pretty strict, so you may want to relax them by editing .eslintrc.json and tsconfig.json.

To lint the project run:

npm run lint

Formatting

Prettier is used for code formatting. It has been pre-configured according to the Polymer Project's style. You can change this in .prettierrc.json.

Prettier has not been configured to run when commiting files, but this can be added with Husky and and pretty-quick. See the prettier.io site for instructions.

Static Site

This project includes a simple website generated with the eleventy static site generator and the templates and pages in /docs-src. The site is generated to /docs and intended to be checked in so that GitHub pages can serve the site from /docs on the master branch. If you serve the files from a directory, you have to prefix all URLs: rename the .env.dist to .env and modify the PATH_PREFIX variable in the new file. This setting only affects the production build.

To enable the site go to the GitHub settings and change the GitHub Pages "Source" setting to "master branch /docs folder".

To build the site, run:

npm run docs

To serve the site locally, run:

npm run docs:serve

To watch the site files, and re-build automatically, run:

npm run docs:watch

To serve and watch at the same time, run:

npm run docs:start

The site will usually be served at http://localhost:8000.

Bundling and minification

This starter project doesn't include any build-time optimizations like bundling or minification. We recommend publishing components as unoptimized JavaScript modules, and performing build-time optimizations at the application level. This gives build tools the best chance to deduplicate code, remove dead code, and so on.

For information on building application projects that include LitElement components, see Build for production on the LitElement site.

More information

See Get started on the LitElement site for more information.

bendera/lit-element-ui-kit-starter-ts