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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.

@-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;
}
}
@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.