diff --git a/src/_base/index.js b/src/_base/index.js
deleted file mode 100644
index 18cd08e88..000000000
--- a/src/_base/index.js
+++ /dev/null
@@ -1,12 +0,0 @@
-export { default as NIconSwitchTransition } from './icon-switch-transition'
-export { default as NFadeInExpandTransition } from './fade-in-expand-transition'
-export { default as NBaseClose } from './close'
-export { default as NBaseIcon } from './icon'
-export { default as NBaseFocusDetector } from './focus-detector'
-export { default as NBaseLoading } from './loading'
-export { default as NBaseSelectMenu } from './select-menu'
-export { default as NBaseWave } from './wave'
-export { default as NBaseMenuMask } from './menu-mask'
-export { default as NBaseSelection } from './selection'
-export { default as NBaseSlotMachine } from './slot-machine'
-export { default as NBaseClear } from './clear'
diff --git a/src/_base/slot-machine/index.js b/src/_base/slot-machine/index.js
deleted file mode 100644
index cd3bbe25f..000000000
--- a/src/_base/slot-machine/index.js
+++ /dev/null
@@ -1 +0,0 @@
-export { default } from './src/SlotMachine.vue'
diff --git a/src/_base/slot-machine/index.ts b/src/_base/slot-machine/index.ts
new file mode 100644
index 000000000..51c1ceef3
--- /dev/null
+++ b/src/_base/slot-machine/index.ts
@@ -0,0 +1 @@
+export { default } from './src/SlotMachine'
diff --git a/src/_base/slot-machine/src/SlotMachine.tsx b/src/_base/slot-machine/src/SlotMachine.tsx
new file mode 100644
index 000000000..d1f49298d
--- /dev/null
+++ b/src/_base/slot-machine/src/SlotMachine.tsx
@@ -0,0 +1,101 @@
+import {
+  h,
+  defineComponent,
+  TransitionGroup,
+  computed,
+  ref,
+  watch,
+  toRef,
+  Ref
+} from 'vue'
+import NFadeInExpandTransition from '../../fade-in-expand-transition'
+import { useStyle } from '../../../_mixins'
+import SlotMachineNumber from './SlotMachineNumber'
+import style from './styles/index.cssr'
+
+export default defineComponent({
+  name: 'BaseSlotMachine',
+  components: {
+    NFadeInExpandTransition,
+    SlotMachineNumber
+  },
+  props: {
+    value: {
+      type: [Number, String],
+      default: 0
+    },
+    max: {
+      type: Number,
+      default: undefined
+    },
+    appeared: {
+      type: Boolean,
+      required: true
+    }
+  },
+  setup (props) {
+    useStyle('BaseSlotMachine', style)
+    const oldValueRef = ref<number>()
+    const newValueRef = ref<number>()
+    const numbersRef = computed(() => {
+      if (typeof props.value === 'string') return []
+      if (props.value < 1) return [0]
+      const numbers = []
+      let value = props.value
+      if (props.max !== undefined) {
+        value = Math.min(props.max, value)
+      }
+      while (value >= 1) {
+        numbers.push(value % 10)
+        value /= 10
+        value = Math.floor(value)
+      }
+      numbers.reverse()
+      return numbers
+    })
+    watch(toRef(props, 'value') as Ref<string | number>, (value, oldValue) => {
+      if (typeof value === 'string') {
+        newValueRef.value = undefined
+        oldValueRef.value = undefined
+      } else {
+        if (typeof oldValue === 'string') {
+          newValueRef.value = value
+          oldValueRef.value = undefined
+        } else {
+          newValueRef.value = value
+          oldValueRef.value = oldValue
+        }
+      }
+    })
+    return () => {
+      const { value } = props
+      return typeof value === 'number' ? (
+        <span class="n-base-slot-machine">
+          <TransitionGroup name="n-fade-up-width-expand-transition" tag="span">
+            {{
+              default: () =>
+                numbersRef.value.map((number, i) => (
+                  <SlotMachineNumber
+                    key={numbersRef.value.length - i - 1}
+                    oldOriginalNumber={oldValueRef.value}
+                    newOriginalNumber={newValueRef.value}
+                    value={number}
+                  />
+                ))
+            }}
+          </TransitionGroup>
+          <NFadeInExpandTransition key="+" width>
+            {{
+              default: () =>
+                props.max !== undefined && props.max < value ? (
+                  <SlotMachineNumber value="+" />
+                ) : null
+            }}
+          </NFadeInExpandTransition>
+        </span>
+      ) : (
+        <span class="n-base-slot-machine">{value}</span>
+      )
+    }
+  }
+})
diff --git a/src/_base/slot-machine/src/SlotMachine.vue b/src/_base/slot-machine/src/SlotMachine.vue
deleted file mode 100644
index 939bcc1f1..000000000
--- a/src/_base/slot-machine/src/SlotMachine.vue
+++ /dev/null
@@ -1,87 +0,0 @@
-<template>
-  <span v-if="valueIsNumber" class="n-base-slot-machine">
-    <transition-group name="n-fade-up-width-expand-transition" tag="span">
-      <slot-machine-number
-        v-for="(number, i) in numbers"
-        :key="numbers.length - i - 1"
-        :old-original-number="oldValue"
-        :new-original-number="newValue"
-        :value="number"
-      />
-    </transition-group>
-    <n-fade-in-expand-transition key="+" width>
-      <slot-machine-number v-if="max && max < value" :value="'+'" />
-    </n-fade-in-expand-transition>
-  </span>
-  <span v-else class="n-base-slot-machine">
-    {{ value }}
-  </span>
-</template>
-
-<script>
-import { defineComponent } from 'vue'
-import NFadeInExpandTransition from '../../fade-in-expand-transition'
-import { useStyle } from '../../../_mixins'
-import SlotMachineNumber from './SlotMachineNumber.vue'
-import style from './styles/index.cssr.js'
-
-export default defineComponent({
-  name: 'BaseSlotMachine',
-  components: {
-    NFadeInExpandTransition,
-    SlotMachineNumber
-  },
-  props: {
-    value: {
-      type: [Number, String],
-      default: 0
-    },
-    max: {
-      type: Number,
-      default: null
-    },
-    appeared: {
-      type: Boolean,
-      required: true
-    }
-  },
-  setup (props) {
-    useStyle('BaseSlotMachine', style)
-  },
-  data () {
-    return {
-      oldValue: null,
-      newValue: this.value
-    }
-  },
-  computed: {
-    valueIsString () {
-      return typeof this.value === 'string'
-    },
-    valueIsNumber () {
-      return typeof this.value === 'number'
-    },
-    numbers () {
-      if (this.value < 1) return [0]
-      const numbers = []
-      let value = this.value
-      if (this.max) {
-        value = Math.min(this.max, value)
-      }
-      while (value >= 1) {
-        numbers.push(value % 10)
-        value /= 10
-        value = Math.floor(value)
-      }
-      numbers.reverse()
-      return numbers
-    }
-  },
-  watch: {
-    value (value, oldValue) {
-      this.newValue = value
-      this.oldValue = oldValue
-    }
-  }
-})
-</script>
diff --git a/src/_base/slot-machine/src/SlotMachineNumber.tsx b/src/_base/slot-machine/src/SlotMachineNumber.tsx
new file mode 100644
index 000000000..845e1fb60
--- /dev/null
+++ b/src/_base/slot-machine/src/SlotMachineNumber.tsx
@@ -0,0 +1,116 @@
+import {
+  defineComponent,
+  h,
+  nextTick,
+  ref,
+  computed,
+  PropType,
+  watch,
+  toRef,
+  Ref
+} from 'vue'
+
+export default defineComponent({
+  name: 'SlotMachineNumber',
+  props: {
+    value: {
+      // could be '+', 1, 2, ...
+      type: [Number, String] as PropType<string | number>,
+      required: true
+    },
+    oldOriginalNumber: {
+      type: Number,
+      default: undefined
+    },
+    newOriginalNumber: {
+      type: Number,
+      default: undefined
+    }
+  },
+  setup (props) {
+    const numberRef = ref<HTMLElement | null>(null)
+    const oldNumberRef = ref<number | string>(props.value)
+    const newNumberRef = ref<number | string>(props.value)
+    const scrollAnimationDirectionRef = ref<'up' | 'down'>('up')
+    const activeRef = ref(false)
+    const newNumberScrollAnimationClassRef = computed(() => {
+      return activeRef.value
+        ? `n-base-slot-machine-current-number--${scrollAnimationDirectionRef.value}-scroll`
+        : null
+    })
+    const oldNumberScrollAnimationClassRef = computed(() => {
+      return activeRef.value
+        ? `n-base-slot-machine-old-number--${scrollAnimationDirectionRef.value}-scroll`
+        : null
+    })
+    // BUG: may be typescript bug
+    watch(toRef(props, 'value') as Ref<string | number>, (value, oldValue) => {
+      oldNumberRef.value = oldValue
+      newNumberRef.value = value
+      void nextTick(scroll)
+    })
+    function scroll (): void {
+      const newOriginalNumber = props.newOriginalNumber
+      const oldOriginalNumber = props.oldOriginalNumber
+      if (oldOriginalNumber === undefined || newOriginalNumber === undefined) { return }
+      if (newOriginalNumber > oldOriginalNumber) {
+        scrollByDir('up')
+      } else if (oldOriginalNumber > newOriginalNumber) {
+        scrollByDir('down')
+      }
+    }
+    function scrollByDir (dir: 'up' | 'down'): void {
+      scrollAnimationDirectionRef.value = dir
+      activeRef.value = false
+      void nextTick(() => {
+        void numberRef.value?.offsetWidth
+        activeRef.value = true
+      })
+    }
+    return () => {
+      return (
+        <span ref={numberRef} class="n-base-slot-machine-number">
+          {oldNumberRef.value !== null ? (
+            <span
+              class={[
+                'n-base-slot-machine-old-number n-base-slot-machine-old-number--top',
+                oldNumberScrollAnimationClassRef.value
+              ]}
+            >
+              {oldNumberRef.value}
+            </span>
+          ) : null}
+          <span
+            class={[
+              'n-base-slot-machine-current-number',
+              newNumberScrollAnimationClassRef.value
+            ]}
+          >
+            <span
+              ref="numberWrapper"
+              class={[
+                'n-base-slot-machine-current-number__inner',
+                {
+                  'n-base-slot-machine-current-number__inner--not-number':
+                    typeof props.value !== 'number'
+                }
+              ]}
+            >
+              {newNumberRef.value}
+            </span>
+          </span>
+          {oldNumberRef.value !== null ? (
+            <span
+              class={[
+                'n-base-slot-machine-old-number n-base-slot-machine-old-number--bottom',
+                oldNumberScrollAnimationClassRef.value
+              ]}
+            >
+              {oldNumberRef.value}
+            </span>
+          ) : null}
+        </span>
+      )
+    }
+  }
+})
diff --git a/src/_base/slot-machine/src/SlotMachineNumber.vue b/src/_base/slot-machine/src/SlotMachineNumber.vue
deleted file mode 100644
index f92c0ca9e..000000000
--- a/src/_base/slot-machine/src/SlotMachineNumber.vue
+++ /dev/null
@@ -1,104 +0,0 @@
-<template>
-  <span ref="numbers" class="n-base-slot-machine-number">
-    <span
-      v-if="oldNumber !== null"
-      class="n-base-slot-machine-old-number n-base-slot-machine-old-number--top"
-      :class="oldNumberScrollAnimationClass"
-    >{{ oldNumber }}</span>
-    <span
-      class="n-base-slot-machine-current-number"
-      :class="newNumberScrollAnimationClass"
-    >
-      <span
-        ref="numberWrapper"
-        class="n-base-slot-machine-current-number__inner"
-        :class="{
-          'n-base-slot-machine-current-number__inner--not-number': isNotNumber
-        }"
-      >{{ newNumber }}</span>
-    </span>
-    <span
-      v-if="oldNumber !== null"
-      class="n-base-slot-machine-old-number n-base-slot-machine-old-number--bottom"
-      :class="oldNumberScrollAnimationClass"
-    >{{ oldNumber }}</span>
-  </span>
-</template>
-
-<script>
-export default {
-  name: 'SlotMachineNumber',
-  props: {
-    value: {
-      type: [Number, String],
-      required: true
-    },
-    oldOriginalNumber: {
-      type: Number,
-      default: null
-    },
-    newOriginalNumber: {
-      type: Number,
-      default: null
-    }
-  },
-  data () {
-    return {
-      oldNumber: null,
-      newNumber: this.value,
-      scrollAnimationDirection: null,
-      active: false
-    }
-  },
-  computed: {
-    newNumberScrollAnimationClass () {
-      return this.active
-        ? `n-base-slot-machine-current-number--${this.scrollAnimationDirection}-scroll`
-        : null
-    },
-    oldNumberScrollAnimationClass () {
-      return this.active
-        ? `n-base-slot-machine-old-number--${this.scrollAnimationDirection}-scroll`
-        : null
-    },
-    isNotNumber () {
-      return !(typeof this.value === 'number')
-    }
-  },
-  watch: {
-    value (value, oldValue) {
-      this.oldNumber = oldValue
-      this.newNumber = value
-      this.$nextTick(this.scroll)
-    }
-  },
-  methods: {
-    scroll () {
-      const newOriginalNumber = this.newOriginalNumber
-      const oldOriginalNumber = this.oldOriginalNumber
-      if (oldOriginalNumber === null && newOriginalNumber === null) return
-      if (oldOriginalNumber === null || newOriginalNumber > oldOriginalNumber) {
-        this.scrollUp()
-      } else if (oldOriginalNumber > newOriginalNumber) {
-        this.scrollDown()
-      }
-    },
-    scrollUp () {
-      this.scrollAnimationDirection = 'up'
-      this.active = false
-      this.$nextTick(() => {
-        void this.$el.offsetWidth
-        this.active = true
-      })
-    },
-    scrollDown () {
-      this.scrollAnimationDirection = 'down'
-      this.active = false
-      this.$nextTick(() => {
-        void this.$el.offsetWidth
-        this.active = true
-      })
-    }
-  }
-}
-</script>
diff --git a/src/_base/slot-machine/src/styles/index.cssr.js b/src/_base/slot-machine/src/styles/index.cssr.ts
similarity index 100%
rename from src/_base/slot-machine/src/styles/index.cssr.js
rename to src/_base/slot-machine/src/styles/index.cssr.ts
diff --git a/src/alert/src/styles/index.cssr.ts b/src/alert/src/styles/index.cssr.ts
index 9a68cb1d7..0635fd6e4 100644
--- a/src/alert/src/styles/index.cssr.ts
+++ b/src/alert/src/styles/index.cssr.ts
@@ -55,8 +55,7 @@ export default cB('alert', `
     width: 26px;
     height: 26px;
     font-size: 26px;
-  `
-  ),
+  `),
   cE('close', `
     transition: color .3s var(--bezier);
     position: absolute;