.eslintrc.json

{
    "root": true,
    "env": {
        "es2021": true,
        "node": true,
        "jest": true
    },
    "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
    "parser": "@typescript-eslint/parser",
    "plugins": ["@typescript-eslint"],
    "parserOptions": {
        "ecmaVersion": 2021,
        "sourceType": "module"
    },
    "ignorePatterns": ["built/*"],
    "rules": {
        "brace-style": [
            "error",
            "1tbs",
            { "allowSingleLine": true }
        ],
        "camelcase": [
            "warn"
        ],
        "comma-dangle": [
            "warn",
            "always-multiline"
        ],
        "curly": [
            "warn",
            "all"
        ],
        "default-case": [
            "error"
        ],
        "eqeqeq": [
            "error",
            "always",
            {
                "null": "always"
            }
        ],
        "indent": [
            "warn",
            4,
            { 
                "SwitchCase": 1,
                "ArrayExpression": "first",
                "ImportDeclaration": "first",
                "ObjectExpression": "first"
            }
        ],
        "linebreak-style": [
            "error",
            "unix"
        ],
        "no-trailing-spaces": [
            "warn"
        ],
        "no-unused-vars": [
            "warn",
            {
                "argsIgnorePattern": "^_",
                "varsIgnorePattern": "^_"
            }
        ],
        "no-useless-escape": [
            "off"
        ],
        "quotes": [
            "error",
            "single"
        ],
        "semi": [
            "error",
            "always"
        ],
        "semi-style": [
            "warn",
            "last"
        ],
        "sort-imports": [
            "warn",
            {
                "ignoreCase": true,
                "memberSyntaxSortOrder": [
                    "none",
                    "all",
                    "multiple",
                    "single"
                ],
                "allowSeparatedGroups": true
            }
        ],
        "sort-vars": [
            "warn"
        ],
        "@typescript-eslint/explicit-function-return-type": "off",
        "@typescript-eslint/no-unused-vars": [
            "error", { 
                "argsIgnorePattern": "^_",
                "varsIgnorePattern": "^_"
            }
        ]
    },
    "overrides": [
        {
          // enable the rule specifically for TypeScript files
          "files": ["*.ts", "*.mts", "*.cts", "*.tsx"],
          "rules": {
            "@typescript-eslint/explicit-function-return-type": "error"
          }
        }
      ]
}