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GitHub - cristianbote/goober: ? goober, a less than 1KB ?css-in-js alternative w...

 6 years ago
source link: https://github.com/cristianbote/goober
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README.md

goober

? goober, a less than 1KB css-in-js solution.

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Motivation

I always wondered, if you can get a working solution for css-in-js with a smaller footprint. I started a project and wanted a to use styled-components. Looking at their sizes, it seems that I would rather not include ~16kB(styled-components) or ~11kB(emotion) just so I can use the styled paradigm. So, I embarked in a mission to create a smaller alternative for these well established apis.

Usage

The API is inspired by emotion, styled function. Meaning, you call it with your tagName and returns a vDOM component for that tag. Note, setPragma is needed to be run before the styled function is used.

import { h } from "preact";
import { styled, setPragma } from "goober";

// Should be called here, and just once
setPragma(h);

const Icon = styled("i")`
  display: flex;
  flex: 1;
  color: red;
`;

const Button = styled("button")`
  background: dodgerblue;
  color: white;
  border: 0;

  &:focus,
  &:hover {
    padding: 1em;
  }

  .otherClass {
    margin: 0;
  }

  ${Icon} {
    color: black;
  }
`;

Examples

SSR

You can get the critical CSS for SSR, via extractCss. Take a look at this example: CodeSandbox: SSR with Preact and goober

API

As you can see it supports most of the syntaxes of CSS. If you find any issues, please submit a ticket or even a PR with a fix.

styled(tagName)

  • @param {String} tagName The name of the dom element you'd like the styled to be applied to
  • @returns {Function} Returns the tag template function.
import { styled } from "goober";

const Btn = styled("button")`
  border-radius: 4px;
`;

setPragma(pragma: Function)

Given the fact that react uses createElement for the transformed elements and preact uses h, setPragma should be called with the proper pragma function. This was added to reduce the bundled size and being able to bundle esmodule version. At the moment I think it's the best tradeoff we can have.

import React from "react";
import { setPragma } from "goober";

setPragma(React.createElement);

css(taggedTemplate)

  • @returns {Function} Returns the tag template function.

Same as styled but without the tagName and vNode generation. In the end the output will be a className.

import { css } from "goober";

const BtnClassName = css`
  border-radius: 4px;
`();
// (!) Note the empty param at the end. If you wanna use `props` throughout the syntax this is the place to put them

const btn = document.querySelector("#btn");
btn.classList.add(BtnClassName);

extractCss()

  • @returns {String}

Returns the <style> tag should be rendered in your document <head> and clears the cache.

const { extractCss } = require("goober");

// After your app has rendered, just call it:
const styleTag  = extractCss();

Features

  • Basic CSS parsing
  • Nested rules with pseudo selectors
  • Nested styled components
  • Media queries (@media)
  • Keyframes (@keyframes)
  • Smart(lazy) client-side hydration
  • Vanilla(via css function)
  • globalStyle so one would be able to create global styles
  • Vendor prefixing

Contributing

Feel free to try it out and checkout the examples. If you wanna fix something feel free to open a issue or a PR.


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