feat: Upgrade ESLint to modern flat config (v9)Fix/eslint modern config

eslint.config.mjs

@@ -0,0 +1,71 @@
+// @ts-check
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import prettier from 'eslint-plugin-prettier/recommended';
+
+export default tseslint.config(
+  // Base ESLint recommended rules
+  eslint.configs.recommended,
+
+  // TypeScript ESLint recommended rules
+  ...tseslint.configs.recommended,
+  ...tseslint.configs.recommendedTypeChecked,
+
+  // Prettier integration
+  prettier,
+
+  // Global ignores
+  {
+    ignores: [
+      'lib/**',
+      'client/**',
+      'utils/**',
+      'node_modules/**',
+      'dist/**',
+      '*.js',
+      '*.mjs',
+      'migrations/**',
+    ],
+  },
+
+  // TypeScript files configuration
+  {
+    files: ['src/**/*.ts', 'tests/**/*.ts'],
+    languageOptions: {
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+    rules: {
+      // Prettier
+      'prettier/prettier': 'error',
+
+      // TypeScript rules
+      '@typescript-eslint/no-inferrable-types': 'off',
+      '@typescript-eslint/no-empty-function': 'off',
+      '@typescript-eslint/no-use-before-define': ['error', { functions: false }],
+      '@typescript-eslint/no-floating-promises': ['error', { ignoreVoid: true }],
+
+      // Warnings
+      'no-warning-comments': 'warn',
+
+      // TODO: fix these - temporarily disabled for migration
+      '@typescript-eslint/no-unsafe-assignment': 'off',
+      '@typescript-eslint/no-unsafe-member-access': 'off',
+      '@typescript-eslint/no-unsafe-call': 'off',
+      '@typescript-eslint/restrict-template-expressions': 'off',
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/restrict-plus-operands': 'off',
+      '@typescript-eslint/no-misused-promises': 'off',
+      '@typescript-eslint/no-unsafe-argument': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+      '@typescript-eslint/no-require-imports': 'off',
+
+      // Allow console in this project
+      'no-console': 'off',
+    },
+  },
+);
+

package.json

@@ -45,9 +45,9 @@
     "start": "node ./lib/index.js",
     "lint": "npm run lint:eslint && npm run lint:prettier",
     "lint:unused-exports": "ts-unused-exports tsconfig.json --showLineNumber",
-    "lint:eslint": "eslint . --ext .js,.jsx,.ts,.tsx -f unix",
+    "lint:eslint": "eslint src tests --format unix",
     "lint:prettier": "prettier --check src/**/*.{ts,json}",
-    "lint:fix": "eslint . --ext .js,.jsx,.ts,.tsx -f unix --fix && prettier --write --check src/**/*.{ts,json}",
+    "lint:fix": "eslint src tests --format unix --fix && prettier --write --check src/**/*.{ts,json}",
     "migrate": "node-pg-migrate -m migrations",
     "devenv:build": "docker compose -f docker/docker-compose.dev.postgres.yml -f docker/docker-compose.dev.stacks-blockchain.yml -f docker/docker-compose.dev.bitcoind.yml -f docker/docker-compose.dev.rosetta-cli.yml build --no-cache",
     "devenv:deploy": "docker compose -f docker/docker-compose.dev.postgres.yml -f docker/docker-compose.dev.stacks-blockchain.yml -f docker/docker-compose.dev.bitcoind.yml up --force-recreate -V",
@@ -180,14 +180,14 @@
     "@types/supertest": "2.0.11",
     "@types/tiny-secp256k1": "2.0.1",
     "@types/uuid": "7.0.5",
-    "@typescript-eslint/eslint-plugin": "5.46.1",
-    "@typescript-eslint/parser": "5.51.0",
+    "@eslint/js": "^9.17.0",
+    "typescript-eslint": "^8.18.1",
     "concurrently": "7.3.0",
     "docker-compose": "0.24.8",
     "dockerode": "4.0.6",
-    "eslint": "8.29.0",
-    "eslint-plugin-prettier": "4.2.1",
-    "eslint-plugin-tsdoc": "0.2.17",
+    "eslint": "^9.17.0",
+    "eslint-plugin-prettier": "^5.2.1",
+    "eslint-config-prettier": "^9.1.0",
     "husky": "4.3.8",
     "is-ci": "3.0.1",
     "jest": "29.7.0",