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frontend/node_modules/antd/es/form/style/explain.js

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+const genFormValidateMotionStyle = token => {
+  const {
+    componentCls
+  } = token;
+  const helpCls = `${componentCls}-show-help`;
+  const helpItemCls = `${componentCls}-show-help-item`;
+  return {
+    [helpCls]: {
+      // Explain holder
+      transition: `opacity ${token.motionDurationFast} ${token.motionEaseInOut}`,
+      '&-appear, &-enter': {
+        opacity: 0,
+        '&-active': {
+          opacity: 1
+        }
+      },
+      '&-leave': {
+        opacity: 1,
+        '&-active': {
+          opacity: 0
+        }
+      },
+      // Explain
+      [helpItemCls]: {
+        overflow: 'hidden',
+        transition: `height ${token.motionDurationFast} ${token.motionEaseInOut},
+                     opacity ${token.motionDurationFast} ${token.motionEaseInOut},
+                     transform ${token.motionDurationFast} ${token.motionEaseInOut} !important`,
+        [`&${helpItemCls}-appear, &${helpItemCls}-enter`]: {
+          transform: `translateY(-5px)`,
+          opacity: 0,
+          '&-active': {
+            transform: 'translateY(0)',
+            opacity: 1
+          }
+        },
+        [`&${helpItemCls}-leave-active`]: {
+          transform: `translateY(-5px)`
+        }
+      }
+    }
+  };
+};
+export default genFormValidateMotionStyle;