eslint.config.js

const eslint = require("@eslint/js");
const tseslint = require("typescript-eslint");
const eslintConfigPrettier = require("eslint-config-prettier");

module.exports = tseslint.config(
  {
    ignores: ["eslint.config.js"],
  },
  eslint.configs.recommended,
  eslintConfigPrettier,
  ...tseslint.configs.recommendedTypeChecked,
  {
    languageOptions: {
      parserOptions: {
        project: true,
        tsconfigRootDir: __dirname,
      },
    },
    rules: {
      // emulate TS behaviour (if noUnusedLocals and noUnusedParameters are enabled): https://typescript-eslint.io/rules/no-unused-vars/#benefits-over-typescript
      "@typescript-eslint/no-unused-vars": [
        "error",
        {
          args: "all",
          argsIgnorePattern: "^_",
          caughtErrors: "all",
          caughtErrorsIgnorePattern: "^_",
          destructuredArrayIgnorePattern: "^_",
          varsIgnorePattern: "^_",
          ignoreRestSiblings: true,
        },
      ],
      // to use promises in express (and catch rejecting promises!) we use express-promise-router, it allows promises,
      // but does not define the type correctly: https://github.com/express-promise-router/express-promise-router/issues/230
      "@typescript-eslint/no-misused-promises": [
        "error",
        {
          checksVoidReturn: {
            arguments: false,
          },
        },
      ],
    },
  },
);