mysql-mcp/eslint.config.js at main · neverinfamous/mysql-mcp · GitHub

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import js from "@eslint/js";
import globals from "globals";
import tseslint from "typescript-eslint";

export default tseslint.config(
  {
    ignores: ["dist", "node_modules", ".wrangler"],
  },
  // Main source configuration
  {
    extends: [
      js.configs.recommended,
      ...tseslint.configs.strictTypeChecked,
      ...tseslint.configs.stylisticTypeChecked,
    ],
    files: ["src/**/*.ts"],
    ignores: ["**/__tests__/**", "**/*.test.ts", "**/*.spec.ts"],
    languageOptions: {
      ecmaVersion: 2022,
      globals: {
        ...globals.node,
      },
      parserOptions: {
        projectService: true,
        tsconfigRootDir: import.meta.dirname,
      },
    },
    rules: {
      // Strict rules - type safety
      "@typescript-eslint/no-explicit-any": "error",
      "@typescript-eslint/explicit-function-return-type": [
        "error",
        {
          allowExpressions: true,
          allowTypedFunctionExpressions: true,
          allowHigherOrderFunctions: true,
          allowDirectConstAssertionInArrowFunctions: true,
          allowConciseArrowFunctionExpressionsStartingWithVoid: true,
        },
      ],
      "@typescript-eslint/no-unused-vars": [
        "error",
        { argsIgnorePattern: "^_" },
      ],
      "@typescript-eslint/no-non-null-assertion": "error",
      "@typescript-eslint/strict-boolean-expressions": [
        "error",
        {
          allowNullableBoolean: true,
          allowNullableString: true,
          allowNullableNumber: false,
          allowNullableObject: true,
        },
      ],
      "@typescript-eslint/no-floating-promises": "error",
      "@typescript-eslint/no-misused-promises": [
        "error",
        {
          checksVoidReturn: {
            attributes: false,
            properties: false,
          },
        },
      ],
      "@typescript-eslint/await-thenable": "error",
      "@typescript-eslint/require-await": "error",
      "@typescript-eslint/no-unnecessary-condition": "off",
      "@typescript-eslint/prefer-nullish-coalescing": [
        "error",
        {
          ignorePrimitives: { string: true, number: true },
        },
      ],
      "@typescript-eslint/prefer-optional-chain": "error",
      // Unsafe any rules
      "@typescript-eslint/no-unsafe-assignment": "error",
      "@typescript-eslint/no-unsafe-member-access": "error",
      "@typescript-eslint/no-unsafe-call": "error",
      "@typescript-eslint/no-unsafe-return": "error",
      "@typescript-eslint/no-unsafe-argument": "error",
      "@typescript-eslint/restrict-template-expressions": [
        "error",
        {
          allowNumber: true,
          allowBoolean: true,
        },
      ],
      "@typescript-eslint/restrict-plus-operands": [
        "error",
        {
          allowNumberAndString: true,
          allowAny: true,
        },
      ],
      "@typescript-eslint/no-confusing-void-expression": [
        "error",
        {
          ignoreArrowShorthand: true,
          ignoreVoidOperator: true,
        },
      ],
      "@typescript-eslint/consistent-type-imports": [
        "error",
        {
          prefer: "type-imports",
          fixStyle: "inline-type-imports",
        },
      ],
      "@typescript-eslint/consistent-type-exports": "error",
      "@typescript-eslint/no-misused-spread": "off",
      // Prevent console.log() which writes to stdout and corrupts MCP stdio transport
      // Only stderr output (error, warn) is safe for MCP servers
      "no-console": ["error", { allow: ["error", "warn"] }],
    },
  },
  // Test file configuration - catches unused imports/vars but relaxes
  // type-safety rules that conflict with test patterns (mocks, any casts)
  {
    files: ["src/**/__tests__/**/*.ts", "src/**/*.test.ts", "src/**/*.spec.ts"],
    extends: [js.configs.recommended, ...tseslint.configs.recommended],
    languageOptions: {
      ecmaVersion: 2022,
      globals: {
        ...globals.node,
      },
    },
    rules: {
      // Core quality rules that should apply to tests
      "@typescript-eslint/no-unused-vars": [
        "error",
        { argsIgnorePattern: "^_" },
      ],
      // Relax type-safety rules for test patterns (mocks, any casts, assertions)
      "@typescript-eslint/no-explicit-any": "off",
      "@typescript-eslint/no-unsafe-assignment": "off",
      "@typescript-eslint/no-unsafe-member-access": "off",
      "@typescript-eslint/no-unsafe-call": "off",
      "@typescript-eslint/no-unsafe-return": "off",
      "@typescript-eslint/no-unsafe-argument": "off",
    },
  },
);