Why ESLint throws 'no-unused-vars' for TypeScript interface?

add this to Eslint rules

"rules": {
  "@typescript-eslint/no-unused-vars": [
    2,
    {
      "args": "none"
    }
  ]
}

Source: I am the maintainer of the typescript-eslint project.

The latest version of the @typescript-eslint tooling now has full support for scope analysis.

So the steps to fix this are now:

• update your versions to at least v4.9.1 of @typescript-eslint/parser and @typescript-eslint/eslint-plugin
• update your ESLint version to at least v6.0.0
• update your config to use @typescript-eslint/no-unused-vars
  • Do not use the base no-unused-vars rule - see this FAQ article in the project.

Restart your IDE and you should now see the correct lint errors.

Use @typescript-eslint/no-unused-vars-experimental and turn off @typescript-eslint/no-unused-vars.

The issue is resolved in the latter version (experimental).

Sample config:

// .eslintrc
{
  ...
  "rules": {
    "@typescript-eslint/no-unused-vars": "off",
    "@typescript-eslint/no-unused-vars-experimental": "error"
  }
  ...
}