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node_modules/ng-zorro-antd/style/mixins/motion.less

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+.motion-common(@duration: @animation-duration-base) {
+  animation-duration: @duration;
+  animation-fill-mode: both;
+}
+
+.motion-common-leave(@duration: @animation-duration-base) {
+  animation-duration: @duration;
+  animation-fill-mode: both;
+}
+
+.make-motion(@className, @keyframeName, @duration: @animation-duration-base) {
+  .@{className}-enter,
+  .@{className}-appear {
+    .motion-common(@duration);
+
+    animation-play-state: paused;
+  }
+  .@{className}-leave {
+    .motion-common-leave(@duration);
+
+    animation-play-state: paused;
+  }
+  .@{className}-enter.@{className}-enter-active,
+  .@{className}-appear.@{className}-appear-active {
+    animation-name: ~'@{keyframeName}In';
+    animation-play-state: running;
+  }
+  .@{className}-leave.@{className}-leave-active {
+    animation-name: ~'@{keyframeName}Out';
+    animation-play-state: running;
+    pointer-events: none;
+  }
+}