preact-dandy

Small and fancy (like my pet dog) CSS-in-JS solution for preact.

Install

npm i preact-dandy

Usage

import styled from "preact-dandy";

interface ButtonProps {
  class?: string;
  color: string;
  flat?: boolean;
  dense?: boolean;
}
const Button = styled<ButtonProps>(
  "button",
  {
    margin: "0.5em",
    padding: "1em",
    border: "unset",
    cursor: "pointer",
    borderRadius: "5px"
  },
  props => ({
    backgroundColor: props.flat ? "transparent" : props.color,
    color: props.flat ? props.color : textColor(props.color),
    padding: props.dense ? "0.5em 1em" : undefined, // Undefined object values are filtered out, use this to not override a property
    boxShadow: props.flat ? "initial" : "0 1.5px 3px rgba(0,0,0,0.3)"
  })
);

The main export is a styled function which takes 3 arguments:

1. el is the element used to render the component. In TypeScript this is restricted to the JSX "Intrinsic elements" to prevent use of HOC as it could lead to undesired behavior. This is however just a soft requirement. el is simply passed to createElement and does not care about its type.
2. css is the CSS object containing the syles to be applied to the component. This object is static, to dynamically style the component, see the cssGenerator argument.
3. cssGenerator (optional) is a function that takes the props as input and outputs a CSS object. This allows dynamic styling based on component values.

For TypeScript users, the styled function contains one optional type argument, which is used to type the props of the resulting component. The props are passed to the cssGenerator function but also to the resulting component, allowing you to have typed components.