.eslintrc.json

{
  "root": true,
  "parser": "@typescript-eslint/parser",
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:svelte/recommended",
    "prettier",
    "plugin:require-extensions/recommended"
  ],
  "plugins": [
    "@typescript-eslint",
    "require-extensions"
  ],
  "overrides": [
    {
      "files": [
        "*.svelte"
      ],
      "parser": "svelte-eslint-parser",
      "parserOptions": {
        "parser": "@typescript-eslint/parser"
      }
    }
  ],
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 2020,
    "extraFileExtensions": [
      ".svelte"
    ]
  },
  "env": {
    "browser": true,
    "es2017": true,
    "node": true
  },
  "rules": {
    "@typescript-eslint/no-non-null-assertion": 0,
    "@typescript-eslint/no-unused-vars": [
      "warn",
      {
        "argsIgnorePattern": "^_"
      }
    ]
  }
}