I'm updating an old project, and adding .d.ts files with it. However, when I run npm run lint, which is defined as eslint src/** in my package.json, the linter complains with

/path/to/project/src/index.d.ts
  2:9  error  Parsing error: Unexpected token type

I'm not using Typescript in my project, only in that file.

My current setup is quite simple, and I haven't modified much the default configuration

// package.json
...
"devDependencies": {
    ...
    "eslint": "^8.3.0",
    "eslint-plugin-import": "^2.25.3",
    ...
},
...

// .eslintrc
{
    "env": {
        "browser": true,
        "commonjs": true,
        "es6": true
    },
    "parserOptions": {
        "sourceType": "module",
        "ecmaVersion": "2018"
    },

    "extends": [
        "eslint:recommended"
    ],
    "plugins": [
        "import"
    ],
    "settings": {
        "import/extensions": [
            ".js"
        ]
    }
}

How would I resolve that error?