Tiny CSS vendor prefixer and property alias mapper for runtime styling solutions
Tiny CSS vendor prefixer and property alias mapper for runtime styling solutions.
Install the library with a package manager, e.g. npm:
npm install style-vendorizer
After that, import transformer functions on demand. A recommended starting point is shown below:
import {
cssPropertyAlias,
cssPropertyPrefixFlags,
cssValuePrefixFlags,
} from "style-vendorizer";
function styleDeclaration(property, value) {
let cssText = "";
/* Resolve aliases, e.g. `gap` -> `grid-gap` */
const propertyAlias = cssPropertyAlias(property);
if (propertyAlias) cssText += `${propertyAlias}:${value};`;
/* Prefix properties, e.g. `backdrop-filter` -> `-webkit-backdrop-filter` */
const propertyFlags = cssPropertyPrefixFlags(property);
if (propertyFlags & 0b001) cssText += `-webkit-${property}:${value};`;
if (propertyFlags & 0b010) cssText += `-moz-${property}:${value};`;
if (propertyFlags & 0b100) cssText += `-ms-${property}:${value};`;
/* Prefix values, e.g. `position: "sticky"` -> `position: "-webkit-sticky"` */
/* Notice that flags don't overlap and property prefixing isn't needed here */
const valueFlags = cssValuePrefixFlags(property, value);
if (valueFlags & 0b001) cssText += `${property}:-webkit-${value};`;
else if (valueFlags & 0b010) cssText += `${property}:-moz-${value};`;
else if (valueFlags & 0b100) cssText += `${property}:-ms-${value};`;
/* Include the standardized declaration last */
/* https://css-tricks.com/ordering-css3-properties/ */
cssText += `${property}:${value};`;
return cssText;
}
Prefix flags may be defined in TypeScript without any overhead as follows:
const enum CSSPrefixFlags {
"-webkit-" = 1 << 0, // 0b001
"-moz-" = 1 << 1, // 0b010
"-ms-" = 1 << 2, // 0b100
}
/* Magic numbers from the previous snippet should be replaced like below: */
if (flags & CSSPrefixFlags["-webkit-"]) cssText += "...";
if (flags & CSSPrefixFlags["-moz-"]) cssText += "...";
if (flags & CSSPrefixFlags["-ms-"]) cssText += "...";
Every browser in the default Browserslist configuration is supported and tested against:
Function values are only prefixed for longhand properties. This guarantees that only the start of each value is compared, for efficiency:
// Prints "1 0"
console.log(
cssPropertyPrefixFlags(
"background-image", // Longhand
"image-set('example.png' 1x, 'example-2x.png' 2x)", // Prefixed
),
cssPropertyPrefixFlags(
"background", // Shorthand
"image-set('example.png' 1x, 'example-2x.png' 2x)", // Not prefixed
),
);
CSS Grid works in IE 11 only when using the following longhand properties:
grid-template-rows
, grid-template-columns
grid-row-start
, grid-column-start
-ms-grid-row-span
and -ms-grid-column-span
(along with grid-row-end
and grid-column-end
for cross-browser compatibility)align-self
, justify-self
cross-fade()
and element()
functions are not prefixed, due to the lack of standard implementations.
Selectors are not yet supported.
This project was heavily inspired by tiny-css-prefixer. Test vectors are obtained from @mdn/browser-compat-data.