.eslintrc.json

{
  "root": true,
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:svelte/recommended"
  ],
  "plugins": [
    "@typescript-eslint",
    "unused-imports"
  ],
  "env": {
    "browser": true,
    "es2017": true,
    "node": true
  },
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 2020,
		"extraFileExtensions": [".svelte"]
  },
  "rules": {
    "comma-dangle": ["warn", "always-multiline"],
    "comma-spacing": ["warn", { "after": true }],
    "eqeqeq": ["error", "always"],
    "indent": ["warn", 2, { "SwitchCase": 2 }],
    "key-spacing": ["warn", { "afterColon": true }],
    "max-len": ["warn", { "code": 120 }],
    "no-extra-boolean-cast": "off",
    "no-nested-ternary": "error",
    "no-multi-spaces": "warn",
    "no-redeclare": "off",
    "@typescript-eslint/no-redeclare": ["error"],
    "no-unused-vars": "off",
    "@typescript-eslint/no-empty-interface": ["off"], 
    "@typescript-eslint/no-unused-vars": ["warn", { "args": "after-used", "ignoreRestSiblings": true }],
    "object-curly-spacing": ["warn", "always"],
    "quotes": ["warn", "single"],
    "semi": ["error", "always"],
    "space-in-parens": ["warn", "never"],
    "spaced-comment": ["warn", "always", { "markers": ["/"] }],
    "unused-imports/no-unused-imports": "warn",
    "eol-last": 2
  },
  "overrides": [
    { 
    "files": ["*.svelte"], 
    "parser": "svelte-eslint-parser",
    "parserOptions": {
      "parser": "@typescript-eslint/parser"
    },
    "rules": {
      "@typescript-eslint/no-unused-vars": [
        "warn",
        {
          "argsIgnorePattern": "^_",
          "varsIgnorePattern": "^\\$\\$(Props|Events|Slots|Generic)$"
        }
      ]
    }
    },
    {
			"files": ["*.ts"],
			"parser": "@typescript-eslint/parser",
			"rules": {
				"@typescript-eslint/ban-types": [
					"error",
					{
						"extendDefaults": true,
						"types": {
							"{}": false
						}
					}
				]
			}
		}
  ]
}