fix(): eslint configuration

.eslintrc.cjs

@@ -0,0 +1,34 @@
+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: 'tsconfig.linting.json',
+    tsconfigRootDir: __dirname,
+    sourceType: 'module',
+  },
+  plugins: [
+    '@typescript-eslint/eslint-plugin',
+    'simple-import-sort',
+    'require-extensions',
+  ],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'plugin:prettier/recommended',
+    'plugin:require-extensions/recommended',
+  ],
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  rules: {
+    '@typescript-eslint/interface-name-prefix': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/no-non-null-assertion': 'off',
+    '@typescript-eslint/ban-types': 'off',
+    'simple-import-sort/imports': 'error',
+    'simple-import-sort/exports': 'error',
+  },
+};

.eslintrc.js

@@ -1,36 +0,0 @@
-module.exports = {
-  env: {
-    es6: true,
-    node: true,
-  },
-  extends: ['eslint:recommended'],
-  parserOptions: {
-    sourceType: 'module',
-    ecmaVersion: 9
-  },
-
-  plugins: [],
-  rules: {
-    'array-bracket-spacing': ['error', 'never'],
-    indent: ['warn', 2],
-    'linebreak-style': ['error', 'unix'],
-    'lines-between-class-members': ['warn', 'always'],
-    semi: ['error', 'always'],
-    'new-cap': 'off',
-    'no-console': 'off',
-    'no-debugger': 'off',
-    'no-mixed-spaces-and-tabs': 2,
-    'no-use-before-define': [2, 'nofunc'],
-    'no-unreachable': ['warn'],
-    'no-unused-vars': ['warn'],
-    'no-extra-parens': ['off'],
-    'no-mixed-operators': ['off'],
-    quotes: [2, 'single', 'avoid-escape'],
-    'block-scoped-var': 2,
-    'brace-style': [2, '1tbs', { allowSingleLine: true }],
-    'computed-property-spacing': [2, 'never'],
-    'keyword-spacing': 2,
-    'space-unary-ops': 2,
-    'max-len': ['warn', { 'code': 140 }]
-  }
-};

package.json

@@ -29,7 +29,12 @@
   "devDependencies": {
     "@types/jest": "^29.0.3",
     "@types/node": "^18.7.23",
+    "@typescript-eslint/eslint-plugin": "^8.18.0",
     "eslint": "^8.24.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-prettier": "^5.2.1",
+    "eslint-plugin-require-extensions": "^0.1.3",
+    "eslint-plugin-simple-import-sort": "^12.1.1",
     "jest": "^29.1.1",
     "source-map-loader": "^4.0.0",
     "ts-jest": "^29.0.2",

src/util/BaseWSClient.ts

@@ -1,12 +1,16 @@
+/* eslint-disable @typescript-eslint/no-unsafe-declaration-merging */
 import EventEmitter from 'events';
 import WebSocket from 'isomorphic-ws';
 
-import { WebsocketClientOptions, WSClientConfigurableOptions } from '../types';
-import WsStore from './WsStore';
-import { WsConnectionStateEnum } from './WsStore.types';
-import { DefaultLogger } from './logger';
-import { isWsPong } from './requestUtils';
-import { getWsAuthSignature } from './websocket-util';
+import {
+  WebsocketClientOptions,
+  WSClientConfigurableOptions,
+} from '../types/index.js';
+import { DefaultLogger } from './logger.js';
+import { isWsPong } from './requestUtils.js';
+import { getWsAuthSignature } from './websocket-util.js';
+import WsStore from './WsStore.js';
+import { WsConnectionStateEnum } from './WsStore.types.js';
 
 interface WSClientEventMap<WsKey extends string> {
   /** Connection opened. If this connection was previously opened and reconnected, expect the reconnected event instead */
@@ -30,6 +34,7 @@ interface WSClientEventMap<WsKey extends string> {
 // Type safety for on and emit handlers: https://stackoverflow.com/a/61609010/880837
 export interface BaseWebsocketClient<
   TWSKey extends string,
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
   TWSTopicSubscribeEventArgs extends object,
 > {
   on<U extends keyof WSClientEventMap<TWSKey>>(
@@ -43,8 +48,6 @@ export interface BaseWebsocketClient<
   ): boolean;
 }
 
-export interface BaseWSClientImpl {}
-
 const LOGGER_CATEGORY = { category: 'bitget-ws' };
 
 export abstract class BaseWebsocketClient<
@@ -382,7 +385,7 @@ export abstract class BaseWebsocketClient<
       this.logger.silly(
         `Subscribing to topics in batches of ${maxTopicsPerEvent}`,
       );
-      for (var i = 0; i < topics.length; i += maxTopicsPerEvent) {
+      for (let i = 0; i < topics.length; i += maxTopicsPerEvent) {
         const batch = topics.slice(i, i + maxTopicsPerEvent);
         this.logger.silly(`Subscribing to batch of ${batch.length}`);
         this.requestSubscribeTopics(wsKey, batch);
@@ -417,7 +420,7 @@ export abstract class BaseWebsocketClient<
       this.logger.silly(
         `Unsubscribing to topics in batches of ${maxTopicsPerEvent}`,
       );
-      for (var i = 0; i < topics.length; i += maxTopicsPerEvent) {
+      for (let i = 0; i < topics.length; i += maxTopicsPerEvent) {
         const batch = topics.slice(i, i + maxTopicsPerEvent);
         this.logger.silly(`Unsubscribing to batch of ${batch.length}`);
         this.requestUnsubscribeTopics(wsKey, batch);

tsconfig.linting.json

@@ -0,0 +1,17 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "module": "commonjs",
+    "outDir": "dist/cjs",
+    "target": "esnext",
+    "rootDir": "../",
+    "allowJs": true
+  },
+  "include": [
+    "src/**/*.*",
+    "test/**/*.*",
+    "examples/**/*.*",
+    ".eslintrc.cjs",
+    "jest.config.ts"
+  ]
+}