diff --git a/.eslintrc.js b/.eslintrc.js
index 6a544c3..908eb7e 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -6,6 +6,7 @@ module.exports = {
     "sourceType": "module"
   },
   "rules": {
+    "semi": "error",
     "indent": ["error", 2, {
       "SwitchCase": 1,
       "VariableDeclarator": 1,
diff --git a/packages/board/src/index.ts b/packages/board/src/index.ts
index 31bdb89..9f3e0cc 100644
--- a/packages/board/src/index.ts
+++ b/packages/board/src/index.ts
@@ -78,15 +78,15 @@ class Board {
   }
 
   clear() {
-    this._displayCtx.clearRect(0, 0, this._displayCanvas.width, this._displayCanvas.height)
+    this._displayCtx.clearRect(0, 0, this._displayCanvas.width, this._displayCanvas.height);
   }
 
   on<T extends keyof TypeBoardEventArgMap >(name: T, callback: (p: TypeBoardEventArgMap[T]) => void) {
-    this._watcher.on(name, callback)
+    this._watcher.on(name, callback);
   }
 
   off<T extends keyof TypeBoardEventArgMap >(name: T, callback: (p: TypeBoardEventArgMap[T]) => void) {
-    this._watcher.off(name, callback)
+    this._watcher.off(name, callback);
   }
 
   private _render() {
@@ -113,8 +113,8 @@ class Board {
   private _parsePrivateOptions(opts: Options): PrivateOptions {
     const defaultOpts = {
       devicePixelRatio: 1,
-    }
-    return { ...defaultOpts, ...opts }
+    };
+    return { ...defaultOpts, ...opts };
   }
 
   private _calculateSize(): { x: number; y: number; w: number; h: number } {
diff --git a/packages/board/src/util/context.ts b/packages/board/src/util/context.ts
index 5cbba04..fb0cc5d 100644
--- a/packages/board/src/util/context.ts
+++ b/packages/board/src/util/context.ts
@@ -34,7 +34,7 @@ class Context implements TypeContext {
       scale: 1,
       scrollX: 0,
       scrollY: 0,
-    }
+    };
   }
 
   getSize() {
@@ -42,7 +42,7 @@ class Context implements TypeContext {
       width: this._opts.width,
       height: this._opts.height,
       devicePixelRatio: this._opts.devicePixelRatio,
-    }
+    };
   }
 
   setTransform(config: Transform) {
@@ -54,7 +54,7 @@ class Context implements TypeContext {
       scale: this._transform.scale,
       scrollX: this._transform.scrollX,
       scrollY: this._transform.scrollY,
-    }
+    };
   }
 
   setFillStyle(color: string) {
@@ -132,7 +132,7 @@ class Context implements TypeContext {
   }
   
   rotate(angle: number) {
-    return this._ctx.rotate(angle)
+    return this._ctx.rotate(angle);
   }
 
   private _doSize(num: number) {
diff --git a/packages/board/src/util/event.ts b/packages/board/src/util/event.ts
index 3bdeb6b..d12bccf 100644
--- a/packages/board/src/util/event.ts
+++ b/packages/board/src/util/event.ts
@@ -1,4 +1,4 @@
-import { TypePoint } from '@idraw/types'
+import { TypePoint } from '@idraw/types';
 
 export interface TypeBoardEventArgMap {
   'point': TypePoint;
@@ -29,7 +29,7 @@ export class BoardEvent implements TypeBoardEvent {
     if (this._listeners.has(eventKey)) {
       const callbacks = this._listeners.get(eventKey);
       callbacks?.push(callback);
-      this._listeners.set(eventKey, callbacks || [])
+      this._listeners.set(eventKey, callbacks || []);
     } else {
       this._listeners.set(eventKey, [callback]);
     }
@@ -46,7 +46,7 @@ export class BoardEvent implements TypeBoardEvent {
           }
         }
       }
-      this._listeners.set(eventKey, callbacks || [])
+      this._listeners.set(eventKey, callbacks || []);
     }
   }
 
diff --git a/packages/board/src/util/style.ts b/packages/board/src/util/style.ts
index 2f81065..ed6a900 100644
--- a/packages/board/src/util/style.ts
+++ b/packages/board/src/util/style.ts
@@ -15,7 +15,7 @@ export const mergeCSS2StyleAttr = function(
   }
   const styleAttr = cssList.join('; ');
   return styleAttr;
-}
+};
 
 
 export function setStyle(
@@ -23,11 +23,11 @@ export function setStyle(
   style: {[key: string]: string}
 ): void {
   const originStyle = getStyle(dom);
-  const _style = {...originStyle, ...style}
+  const _style = {...originStyle, ...style};
   const keys: string[] = Object.keys(_style);
   let styleStr = '';
   keys.forEach((key: string) => {
-    styleStr += `${key}:${_style[key] || ''};`
+    styleStr += `${key}:${_style[key] || ''};`;
   });
   dom.setAttribute('style', styleStr);
 }
@@ -41,7 +41,7 @@ export function getStyle(dom: HTMLElement): {[key: string]: string} {
     if (dataList[0] && typeof dataList[0] === 'string') {
       styleObj[dataList[0]] = dataList[1] || '';
     }
-  })
+  });
 
   return styleObj;
 }
@@ -74,7 +74,7 @@ export function getDomTransform(dom: HTMLElement): {
     scaleY: matrixList[3] || 1,
     translateX: matrixList[4] || 0,
     translateY: matrixList[5] || 0,
-  }
+  };
   return matrix;
 }
 
diff --git a/packages/board/src/util/watcher.ts b/packages/board/src/util/watcher.ts
index 036d091..f2b1a91 100644
--- a/packages/board/src/util/watcher.ts
+++ b/packages/board/src/util/watcher.ts
@@ -19,11 +19,11 @@ export class Watcher {
   }
 
   on<T extends keyof TypeBoardEventArgMap >(name: T, callback: (p: TypeBoardEventArgMap[T]) => void): void {
-    this._event.on(name, callback)
+    this._event.on(name, callback);
   }
 
   off<T extends keyof TypeBoardEventArgMap >(name: T, callback: (p: TypeBoardEventArgMap[T]) => void): void {
-    this._event.off(name, callback)
+    this._event.off(name, callback);
   }
 
   _initEvent(): void {
@@ -106,7 +106,7 @@ export class Watcher {
   }
 
   private _isVaildPoint(p: TypePoint): boolean {
-    return ( p.x > 0 && p.y > 0)
+    return ( p.x > 0 && p.y > 0);
   }
   
 }
diff --git a/packages/core/src/lib/calculate.ts b/packages/core/src/lib/calculate.ts
index 22a6d72..7cd9103 100644
--- a/packages/core/src/lib/calculate.ts
+++ b/packages/core/src/lib/calculate.ts
@@ -40,12 +40,12 @@ export function calcRadian(center: TypePoint, start: TypePoint, end: TypePoint):
 
 function calcLineAngle(center: TypePoint, p: TypePoint): number | null {
   const x = p.x - center.x;
-  const y = center.y - p.y
+  const y = center.y - p.y;
   if (x === 0) {
     if (y < 0) {
-      return Math.PI / 2
+      return Math.PI / 2;
     } else if (y > 0) {
-      return Math.PI * ( 3 / 2 )
+      return Math.PI * ( 3 / 2 );
     }
   } else if (y === 0) {
     if (x < 0) {
@@ -55,13 +55,13 @@ function calcLineAngle(center: TypePoint, p: TypePoint): number | null {
     }
   }
   if (x > 0 && y < 0) {
-    return Math.atan(Math.abs(y) / Math.abs(x))
+    return Math.atan(Math.abs(y) / Math.abs(x));
   } else if (x < 0 && y < 0) {
-    return Math.PI - Math.atan(Math.abs(y) / Math.abs(x))
+    return Math.PI - Math.atan(Math.abs(y) / Math.abs(x));
   } else if (x < 0 && y > 0) {
-    return Math.PI + Math.atan(Math.abs(y) / Math.abs(x))
+    return Math.PI + Math.atan(Math.abs(y) / Math.abs(x));
   } else if (x > 0 && y > 0) {
-    return Math.PI * 2 - Math.atan(Math.abs(y) / Math.abs(x))
+    return Math.PI * 2 - Math.atan(Math.abs(y) / Math.abs(x));
   }
   return null;
 }
\ No newline at end of file
diff --git a/packages/core/src/lib/config.ts b/packages/core/src/lib/config.ts
index 96a45d2..d392be5 100644
--- a/packages/core/src/lib/config.ts
+++ b/packages/core/src/lib/config.ts
@@ -7,13 +7,13 @@ const defaultConfig: TypeConfigStrict = {
     lineWidth: 1,
     lineDash: [4, 3],
   }
-}
+};
 
 function mergeConfig(config?: TypeConfig): TypeConfigStrict {
   const result = defaultConfig;
   if (config) {
     if (config.elementWrapper) {
-      result.elementWrapper = {...result.elementWrapper, ...config.elementWrapper}
+      result.elementWrapper = {...result.elementWrapper, ...config.elementWrapper};
     }
   }
   return result;
@@ -21,5 +21,5 @@ function mergeConfig(config?: TypeConfig): TypeConfigStrict {
 
 export {
   mergeConfig,
-}
+};
 
diff --git a/packages/core/src/lib/draw.ts b/packages/core/src/lib/draw.ts
index 6a07700..065fafd 100644
--- a/packages/core/src/lib/draw.ts
+++ b/packages/core/src/lib/draw.ts
@@ -13,7 +13,7 @@ const { isColorStr } = util.color;
 
 export function drawContext(ctx: TypeContext, data: TypeData, config: TypeHelperConfig): void {
   const size = ctx.getSize();
-  ctx.clearRect(0, 0, size.width, size.height)
+  ctx.clearRect(0, 0, size.width, size.height);
 
   if (typeof data.bgColor === 'string' && isColorStr(data.bgColor)) {
     drawBgColor(ctx, data.bgColor);
diff --git a/packages/core/src/lib/element.ts b/packages/core/src/lib/element.ts
index 6a96edb..e22f37d 100644
--- a/packages/core/src/lib/element.ts
+++ b/packages/core/src/lib/element.ts
@@ -31,7 +31,7 @@ export class Element {
   isPointInElement(p: TypePoint, data: TypeData): [number, string | null] {
     const ctx = this._ctx;
     let idx = -1;
-    let uuid = null
+    let uuid = null;
     for (let i = data.elements.length - 1; i >= 0; i--) {
       const ele = data.elements[i];
 
diff --git a/packages/core/src/lib/helper.ts b/packages/core/src/lib/helper.ts
index bdfb496..37bd068 100644
--- a/packages/core/src/lib/helper.ts
+++ b/packages/core/src/lib/helper.ts
@@ -43,7 +43,7 @@ export class Helper implements TypeHelper {
   getElementIndexByUUID(uuid: string): number | null {
     const index = this._helperConfig.elementIndexMap[uuid];
     if (index >= 0) {
-      return index
+      return index;
     }
     return null;
   }
diff --git a/packages/core/src/lib/transform.ts b/packages/core/src/lib/transform.ts
index 5dcdeb7..ec4d4ea 100644
--- a/packages/core/src/lib/transform.ts
+++ b/packages/core/src/lib/transform.ts
@@ -41,4 +41,4 @@ function rotateContext(
 export {
   rotateContext,
   rotateElement,
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/packages/core/src/util/index.ts b/packages/core/src/util/index.ts
index 8447878..2400de1 100644
--- a/packages/core/src/util/index.ts
+++ b/packages/core/src/util/index.ts
@@ -24,4 +24,4 @@ export default {
   uuid: {
     createUUID
   }
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/packages/core/src/util/time.ts b/packages/core/src/util/time.ts
index 81b26e8..564f148 100644
--- a/packages/core/src/util/time.ts
+++ b/packages/core/src/util/time.ts
@@ -7,18 +7,18 @@ export function compose (middleware: Middleware[]): (context: any, next?: Middle
 
     function dispatch (i: number): Promise<any> {
       // index = i
-      let fn: Middleware = middleware[i]
+      let fn: Middleware = middleware[i];
       if (i === middleware.length && next) {
         fn = next;
       }
-      if (!fn) return Promise.resolve()
+      if (!fn) return Promise.resolve();
       try {
         return Promise.resolve(fn(context, dispatch.bind(null, i + 1)));
       } catch (err) {
-        return Promise.reject(err)
+        return Promise.reject(err);
       }
     }
-  }
+  };
 }
 
 
@@ -27,7 +27,7 @@ export function delay(time: number): Promise<void> {
     setTimeout(() => {
       resolve();
     }, time);
-  })
+  });
 }
 
 export function throttle(fn: (...args: any[]) => any, timeout: number): (...args: any[]) => any {
@@ -39,7 +39,7 @@ export function throttle(fn: (...args: any[]) => any, timeout: number): (...args
     timer = setTimeout(() => {
       fn(...args);
       timer = -1;
-    }, timeout)
-  }
+    }, timeout);
+  };
 }
 
diff --git a/packages/idraw/src/index.ts b/packages/idraw/src/index.ts
index 7f59f9f..b0efd85 100644
--- a/packages/idraw/src/index.ts
+++ b/packages/idraw/src/index.ts
@@ -19,7 +19,7 @@
 
 class IDraw {
   render(): void {
-    console.log('hello world')
+    console.log('hello world');
   }
 }
 
diff --git a/packages/types/src/lib/board.ts b/packages/types/src/lib/board.ts
index 266162f..23d71d0 100644
--- a/packages/types/src/lib/board.ts
+++ b/packages/types/src/lib/board.ts
@@ -5,4 +5,4 @@ type TypePoint = {
 
 export {
   TypePoint,
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/packages/types/src/lib/config.ts b/packages/types/src/lib/config.ts
index 68b0042..8878d71 100644
--- a/packages/types/src/lib/config.ts
+++ b/packages/types/src/lib/config.ts
@@ -19,4 +19,4 @@ type TypeConfigStrict = TypeConfig & {
 export {
   TypeConfig,
   TypeConfigStrict
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/packages/types/src/lib/context.ts b/packages/types/src/lib/context.ts
index 5ab84af..33874fe 100644
--- a/packages/types/src/lib/context.ts
+++ b/packages/types/src/lib/context.ts
@@ -35,4 +35,4 @@ interface TypeContext {
 
 export {
   TypeContext
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/packages/types/src/lib/data.ts b/packages/types/src/lib/data.ts
index 0b3235f..7ff7d1e 100644
--- a/packages/types/src/lib/data.ts
+++ b/packages/types/src/lib/data.ts
@@ -7,4 +7,4 @@ type TypeData = {
 
 export {
   TypeData
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/packages/types/src/lib/element.ts b/packages/types/src/lib/element.ts
index 6668a66..b0ac00d 100644
--- a/packages/types/src/lib/element.ts
+++ b/packages/types/src/lib/element.ts
@@ -47,4 +47,4 @@ export {
   TypeElemDescCircle,
   TypeElemDesc,
   TypeElement,
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/packages/types/src/lib/helper.ts b/packages/types/src/lib/helper.ts
index 6e43bd5..1dc2ea8 100644
--- a/packages/types/src/lib/helper.ts
+++ b/packages/types/src/lib/helper.ts
@@ -51,4 +51,4 @@ export {
   TypeHelperConfig,
   TypeHelperUpdateOpts,
   TypeHelperWrapperDotDirection,
-}
\ No newline at end of file
+};
\ No newline at end of file