diff --git a/src/core/apis/file.ts b/src/core/apis/file.ts
index a5a4f167..1c00a8df 100644
--- a/src/core/apis/file.ts
+++ b/src/core/apis/file.ts
@@ -147,7 +147,7 @@ export class NTQQFileApi {
         } catch (e) {
             logger.logError('获取视频信息失败，将使用默认值', e);
         }
-        let newFilePath = filePath + '.mp4';
+        const newFilePath = filePath + '.mp4';
         fs.renameSync(filePath, newFilePath);
         filePath = newFilePath;
         const { fileName: _fileName, path, fileSize, md5 } = await this.core.apis.FileApi.uploadFile(filePath, ElementType.VIDEO);
diff --git a/src/core/helper/rkey.ts b/src/core/helper/rkey.ts
index 89517e21..4806baf2 100644
--- a/src/core/helper/rkey.ts
+++ b/src/core/helper/rkey.ts
@@ -40,7 +40,7 @@ export class RkeyManager {
 
     async refreshRkey(): Promise<any> {
         //刷新rkey
-        for (let url of this.serverUrl) {
+        for (const url of this.serverUrl) {
             try {
                 this.rkeyData = await RequestUtil.HttpGetJson<ServerRkeyData>(url, 'GET');
             } catch (e) {
diff --git a/src/onebot/action/go-cqhttp/UploadGroupFile.ts b/src/onebot/action/go-cqhttp/UploadGroupFile.ts
index 755ca2d0..3fc5005b 100644
--- a/src/onebot/action/go-cqhttp/UploadGroupFile.ts
+++ b/src/onebot/action/go-cqhttp/UploadGroupFile.ts
@@ -37,10 +37,10 @@ export default class GoCQHTTPUploadGroupFile extends BaseAction<Payload, null> {
         if (!downloadResult.success) {
             throw new Error(downloadResult.errMsg);
         }
-        let msgContext: MessageContext = {
+        const msgContext: MessageContext = {
             peer: peer,
             deleteAfterSentFiles: []
-        }
+        };
         const sendFileEle = await this.core.apis.FileApi.createValidSendFileElement(msgContext, downloadResult.path, payload.name, payload.folder_id);
         await this.obContext.apis.MsgApi.sendMsgWithOb11UniqueId(peer, [sendFileEle], [], true);
         return null;
diff --git a/src/onebot/action/go-cqhttp/UploadPrivateFile.ts b/src/onebot/action/go-cqhttp/UploadPrivateFile.ts
index ebba2ad6..856e32b2 100644
--- a/src/onebot/action/go-cqhttp/UploadPrivateFile.ts
+++ b/src/onebot/action/go-cqhttp/UploadPrivateFile.ts
@@ -45,13 +45,13 @@ export default class GoCQHTTPUploadPrivateFile extends BaseAction<Payload, null>
             throw new Error(downloadResult.errMsg);
         }
 
-        let msgContext: MessageContext = {
+        const msgContext: MessageContext = {
             peer: await createContext(this.core, {
                 user_id: payload.user_id.toString(),
                 group_id: undefined,
             }, ContextMode.Private),
             deleteAfterSentFiles: []
-        }
+        };
         const sendFileEle: SendFileElement = await this.core.apis.FileApi.createValidSendFileElement(msgContext, downloadResult.path, payload.name);
         await this.obContext.apis.MsgApi.sendMsgWithOb11UniqueId(await this.getPeer(payload), [sendFileEle], [], true);
         return null;
diff --git a/src/onebot/api/group.ts b/src/onebot/api/group.ts
index 8e6f9499..fb2d646f 100644
--- a/src/onebot/api/group.ts
+++ b/src/onebot/api/group.ts
@@ -142,22 +142,22 @@ export class OneBotGroupApi {
                         //下面得改 上面也是错的grayTipElement.subElementType == GrayTipElementSubType.MEMBER_NEW_TITLE
                         const type = json.items[json.items.length - 1]?.txt;
                         switch (type) {
-                            case "头衔": {
-                                const memberUin = json.items[1].param[0];
-                                const title = json.items[3].txt;
-                                logger.logDebug('收到群成员新头衔消息', json);
-                                return new OB11GroupTitleEvent(
-                                    this.core,
-                                    parseInt(msg.peerUid),
-                                    parseInt(memberUin),
-                                    title,
-                                );
-                            };
-                            case "移出":
-                                logger.logDebug('收到机器人被踢消息', json);
-                                return;
-                            default:
-                                logger.logWarn('收到未知的灰条消息', json);
+                        case "头衔": {
+                            const memberUin = json.items[1].param[0];
+                            const title = json.items[3].txt;
+                            logger.logDebug('收到群成员新头衔消息', json);
+                            return new OB11GroupTitleEvent(
+                                this.core,
+                                parseInt(msg.peerUid),
+                                parseInt(memberUin),
+                                title,
+                            );
+                        }
+                        case "移出":
+                            logger.logDebug('收到机器人被踢消息', json);
+                            return;
+                        default:
+                            logger.logWarn('收到未知的灰条消息', json);
                         }
                     }
                 }
diff --git a/src/onebot/api/msg.ts b/src/onebot/api/msg.ts
index a29c1466..a2a6a156 100644
--- a/src/onebot/api/msg.ts
+++ b/src/onebot/api/msg.ts
@@ -819,7 +819,7 @@ export class OneBotMsgApi {
 
         return { path, fileName: inputdata.name ?? fileName };
     }
-     async parseSysMessage(msg: number[]) {
+    async parseSysMessage(msg: number[]) {
         const sysMsg = SysMessage.decode(Uint8Array.from(msg)) as unknown as SysMessageType;
         if (sysMsg.msgSpec.length === 0) {
             return;
@@ -827,9 +827,9 @@ export class OneBotMsgApi {
         const { msgType, subType, subSubType } = sysMsg.msgSpec[0];
         if (msgType === 528 && subType === 39 && subSubType === 39) {
             if (!sysMsg.bodyWrapper) return;
-            let event = await this.obContext.apis.UserApi.parseLikeEvent(sysMsg.bodyWrapper.wrappedBody);
+            const event = await this.obContext.apis.UserApi.parseLikeEvent(sysMsg.bodyWrapper.wrappedBody);
             return event;
-        };
+        }
         /*
         if (msgType === 732 && subType === 16 && subSubType === 16) {
             const greyTip = GreyTipWrapper.fromBinary(Uint8Array.from(sysMsg.bodyWrapper!.wrappedBody.slice(7)));
diff --git a/src/onebot/network/passive-websocket.ts b/src/onebot/network/passive-websocket.ts
index 0f4e5c61..115a432a 100644
--- a/src/onebot/network/passive-websocket.ts
+++ b/src/onebot/network/passive-websocket.ts
@@ -47,7 +47,7 @@ export class OB11PassiveWebSocketAdapter implements IOB11NetworkAdapter {
             }
             //鉴权
             this.authorize(token, wsClient, wsReq);
-            let paramUrl = wsReq.url?.indexOf('?') !== -1 ? wsReq.url?.substring(0, wsReq.url?.indexOf('?')) : wsReq.url;
+            const paramUrl = wsReq.url?.indexOf('?') !== -1 ? wsReq.url?.substring(0, wsReq.url?.indexOf('?')) : wsReq.url;
             const isEventConnect = paramUrl === '/event' || paramUrl === '' || paramUrl === '/';
             if (isEventConnect) {
                 this.connectEvent(core, wsClient);