h-h

h-h is a micro-library (<2.5 KB) for creating user interfaces. It doesn't require compilation as it uses HyperScript as a template engine. Instead of using a Virtual DOM, it uses dom diff to update the DOM reducing the memory allocation and GC thrashing for incremental updates. Its hooks allow reactive updates and side effects with a small API. It can be used for Static Site Generation, Server-Side Rendering and Client-Side Rendering.

Key Features

Micro-library <2.5 KB
Without dependencies
No compilation needed
HyperScript as a template engine
No Virtual DOM, uses dom-diff to update the DOM
Reactive updates and side effects
Small API, not much to learn
Static Site Generator, Server-Side Rendering and Client-Side Rendering
Plus, a tiny router

Let's Play

You can start using it without bundlers or compilers.

Demo CodeSandbox.

<!DOCTYPE html>
<html lang="en">
    <head>
        <script type="module">
            import {
                app,
                component,
                h,
            } from 'https://cdn.jsdelivr.net/gh/gc-victor/h-h/dist/esm/index.js';

            const Counter = component(({ update }) => {
                const [count, setCount] = update(0);

                const add = (ev) => setCount(ev.target.value);
                const increment = () => setCount(count() + 1);
                const decrement = () => setCount(count() - 1);

                return h('div', {}, [
                    h('button', { onClick: increment }, ['+']),
                    h('input', { key: 'input', type: 'number', onInput: add, value: count() }, []),
                    h('button', { onClick: decrement }, ['-']),
                ]);
            })();

            app(document.getElementById('app'), Counter());
        </script>
    </head>
    <body>
        <main id="app"></main>
    </body>
</html>

Installation

You can use pnpm, npm or yarn to install it.

npm install git+https://github.com/gc-victor/h-h.git#main

Import it in your application.

import { app, h, component } from 'h-h';

Or import it in a <script> as a module.

<script type="module">
    import { app, h, component } from 'https://cdn.jsdelivr.net/gh/gc-victor/h-h/dist/esm/index.js';
</script>

Dependencies

The only dependency is html-element for Server Side Rendering or Static Site Generation.

npm install html-element

import 'html-element/global-shim';

// Your code ...

Template engine

By default, you can use HyperScript. It doesn't require bundlers or compilers.

h('h1', { className: 'bold' }, ['h-h']);

A key attribute is required to keep the focus of an active element when its content change.

h('input', { key: 'input', value: newValue() }, []);

To transpile JSX you can use esbuild or Babel plugin to convert it to JavaScript.

import { app } from 'h-h';

const App = component(() => {
    return <h1 className="bold">h-h</h1>;
})();

app(document.getElementById('app'), App());

Component

h-h components provide isolated states to work with it and offer a small API to make it easy to learn.

API

The injected hooks allow reactive updates and side effects for the components.

const App = component(({ cleanup, execute, props, update }) => {
    const [state, setState] = update('');

    execute(() => {
        console.log('EXECUTED ONCE');
    }, []);
    execute(() => {
        console.log('EXECUTED EACH TIME THE VARIABLE CHANGES');
    }, [variable]);
    cleanup(() => {
        console.log('cleanup');
    });

    return h('h1', {}, ['h-h']);
});

cleanup: is triggered when the component element is deleted from the DOM
execute: is the main way to trigger side effects, you can use more than once in a single component
props: are the properties used to send data from one component to another
update: manages the component states, you can use more than once in a single component. It returns an array, where the first item is a function with the current state, and the second is the setter

App

You can create as many apps as you need.

app(document.getElementById('app'), App());

Router

The router has to be initialized as part of the configuration of our application.

router({
    '/': {
        id: 'app', // by defaul the id is app
        title: () => 'App 1',
        view: () => h('div', {}, ['App 1']),
    },
    '/:slug': {
        id: 'app2', // by defaul the id is app
        title: () => 'App 2',
        view: () => h('div', {}, ['App 2']),
    },
});

To navigate through the application, you have to add the to method to an anchor.

import { to } from 'h-h/router';

h('a', { href: '/', onClick: to }, ['View 1']);

Acknowledgments

Inspiration

Tools

Compatible Versioning

Summary

Given a version number MAJOR.MINOR, increment the:

MAJOR version when you make backwards-incompatible updates of any kind
MINOR version when you make 100% backwards-compatible updates

Additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR format.

Contribute

First off, thanks for taking the time to contribute! Now, take a moment to be sure your contributions make sense to everyone else.

Reporting Issues

Found a problem? Want a new feature? First of all, see if your issue or idea has already been reported. If it hasn't, just open a new clear and descriptive issue.

Commit message conventions

A specification for adding human and machine readable meaning to commit messages.

Conventional Commits

Submitting pull requests

Pull requests are the greatest contributions, so be sure they are focused in scope and do avoid unrelated commits.

Fork it!
Clone your fork: git clone http://github.com/<your-username>/h-h
Navigate to the newly cloned directory: cd h-h
Create a new branch for the new feature: git checkout -b my-new-feature
Install the tools necessary for development: npm install
Make your changes.
npm run build to verify your change doesn't increase output size.
npm test to make sure your change doesn't break anything.
Commit your changes: git commit -am 'feat: add a feature'
Push to the branch: git push origin my-new-feature
Submit a pull request with full remarks documenting your changes.

License

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

gc-victor / h-h

h-h