PostCSS Discard Overridden

[PostCSS] plugin to discard overridden @keyframes or @counter-style.

@keyframes or @counter-style will be overridden by those who share the same identifiers and appear later in stylesheets. So we can discard all of them except the last one. When defined inside a @media or @supports rule, @keyframes and @counter-style rules only override global rules in some of the client browsers so they need handled separately. This plugin has taken care of this and transforms the PostCss AST safely.

[PostCSS]: https://github.com/postcss/postcss

``css
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@media (max-width: 500px) {
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@supports (display: flex) {
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
}
}
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
`

`css
@media (max-width: 500px) {
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 0.8;
}
}
@supports (display: flex) {
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
}
}
@-webkit-keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
@keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
``

Usage

See the PostCSS documentation for
examples for your environment.

Contributors

See CONTRIBUTORS.md.