diff --git a/packages/area/index.ts b/packages/area/index.ts
index 5503fdc6..ea338929 100644
--- a/packages/area/index.ts
+++ b/packages/area/index.ts
@@ -102,7 +102,7 @@ VantComponent({
     onChange(event: WechatMiniprogram.CustomEvent) {
       const { index, picker, value } = event.detail;
       this.code = value[index].code;
-      this.setValues().then(() => {
+      this.setValues()?.then(() => {
         this.$emit('change', {
           picker,
           values: this.parseValues(picker.getValues()),
diff --git a/packages/calendar/components/month/index.ts b/packages/calendar/components/month/index.ts
index 5256888c..913d4d19 100644
--- a/packages/calendar/components/month/index.ts
+++ b/packages/calendar/components/month/index.ts
@@ -10,7 +10,7 @@ interface Day {
   date: Date;
   type: string;
   text: number;
-  bottomInfo: string;
+  bottomInfo?: string;
 }
 
 VantComponent({
@@ -125,13 +125,13 @@ VantComponent({
     getRangeDayType(day) {
       const { currentDate, allowSameDay } = this.data;
       if (!Array.isArray(currentDate)) {
-        return;
+        return '';
       }
 
       const [startDay, endDay] = currentDate;
 
       if (!startDay) {
-        return;
+        return '';
       }
 
       const compareToStart = compareDay(day, startDay);
@@ -157,6 +157,8 @@ VantComponent({
       if (compareToStart > 0 && compareToEnd < 0) {
         return 'middle';
       }
+
+      return '';
     },
 
     getDayType(day) {
@@ -178,6 +180,8 @@ VantComponent({
       if (type === 'range') {
         return this.getRangeDayType(day);
       }
+
+      return '';
     },
 
     getBottomInfo(type) {
diff --git a/packages/calendar/index.ts b/packages/calendar/index.ts
index eb7e8bdb..47bbec3a 100644
--- a/packages/calendar/index.ts
+++ b/packages/calendar/index.ts
@@ -272,7 +272,7 @@ VantComponent({
       }
     },
 
-    select(date, complete) {
+    select(date, complete?: boolean) {
       if (complete && this.data.type === 'range') {
         const valid = this.checkRange(date);
 
diff --git a/packages/circle/index.ts b/packages/circle/index.ts
index 1645a938..419dfbeb 100644
--- a/packages/circle/index.ts
+++ b/packages/circle/index.ts
@@ -68,7 +68,7 @@ VantComponent({
   },
 
   methods: {
-    getContext() {
+    getContext(): Promise<WechatMiniprogram.CanvasContext> {
       const { type, size } = this.data;
 
       if (type === '' || !canIUseCanvas2d()) {
@@ -108,7 +108,10 @@ VantComponent({
           Object.keys(color)
             .sort((a, b) => parseFloat(a) - parseFloat(b))
             .map((key) =>
-              LinearColor.addColorStop(parseFloat(key) / 100, color[key])
+              LinearColor.addColorStop(
+                parseFloat(key) / 100,
+                color[key] as string
+              )
             );
           this.hoverColor = LinearColor;
         });
@@ -118,7 +121,7 @@ VantComponent({
       return Promise.resolve();
     },
 
-    presetCanvas(context, strokeStyle, beginAngle, endAngle, fill) {
+    presetCanvas(context, strokeStyle, beginAngle, endAngle, fill?: string) {
       const { strokeWidth, lineCap, clockwise, size } = this.data;
       const position = size / 2;
       const radius = position - strokeWidth / 2;
diff --git a/packages/common/utils.ts b/packages/common/utils.ts
index dc6dc0ea..9fe49709 100644
--- a/packages/common/utils.ts
+++ b/packages/common/utils.ts
@@ -15,7 +15,7 @@ export function nextTick(cb: (...args: any[]) => void) {
   }
 }
 
-let systemInfo: WechatMiniprogram.GetSystemInfoSyncResult;
+let systemInfo: WechatMiniprogram.SystemInfo;
 export function getSystemInfoSync() {
   if (systemInfo == null) {
     systemInfo = wx.getSystemInfoSync();
diff --git a/packages/datetime-picker/index.ts b/packages/datetime-picker/index.ts
index 804dde1d..e763f0f1 100644
--- a/packages/datetime-picker/index.ts
+++ b/packages/datetime-picker/index.ts
@@ -145,9 +145,8 @@ VantComponent({
       const { filter } = this.data;
       const results = this.getRanges().map(({ type, range }) => {
         let values = times(range[1] - range[0] + 1, (index) => {
-          let value = range[0] + index;
-          value = type === 'year' ? `${value}` : padZero(value);
-          return value;
+          const value = range[0] + index;
+          return type === 'year' ? `${value}` : padZero(value);
         });
 
         if (filter) {
diff --git a/packages/picker-column/index.ts b/packages/picker-column/index.ts
index 092ee276..cdd4f624 100644
--- a/packages/picker-column/index.ts
+++ b/packages/picker-column/index.ts
@@ -113,7 +113,7 @@ VantComponent({
         : option;
     },
 
-    setIndex(index: number, userAction: boolean) {
+    setIndex(index: number, userAction?: boolean) {
       const { data } = this;
       index = this.adjustIndex(index) || 0;
       const offset = -index * data.itemHeight;
diff --git a/packages/slider/index.ts b/packages/slider/index.ts
index 6d79cc35..53e89cb3 100644
--- a/packages/slider/index.ts
+++ b/packages/slider/index.ts
@@ -89,7 +89,7 @@ VantComponent({
       });
     },
 
-    updateValue(value: number, end: boolean, drag: boolean) {
+    updateValue(value: number, end?: boolean, drag?: boolean) {
       value = this.format(value);
       const { min } = this.data;
       const width = `${((value - min) * 100) / this.getRange()}%`;
diff --git a/packages/sticky/index.ts b/packages/sticky/index.ts
index e6fad06e..f4406408 100644
--- a/packages/sticky/index.ts
+++ b/packages/sticky/index.ts
@@ -51,7 +51,7 @@ VantComponent({
   },
 
   methods: {
-    onScroll({ scrollTop } = {}) {
+    onScroll({ scrollTop }: { scrollTop?: number } = {}) {
       const { container, offsetTop, disabled } = this.data;
 
       if (disabled) {
diff --git a/packages/uploader/index.ts b/packages/uploader/index.ts
index 30dc57fd..0ab1c44f 100644
--- a/packages/uploader/index.ts
+++ b/packages/uploader/index.ts
@@ -82,7 +82,7 @@ VantComponent({
       this.setData({ lists, isInCount: lists.length < maxCount });
     },
 
-    getDetail(index) {
+    getDetail(index?: number) {
       return {
         name: this.data.name,
         index: index == null ? this.data.fileList.length : index,