Can´t get typedefs for "classnames"

I want to use the javascript package called "classnames", but no matter what I do, I cant install the typedefs for it.

I already tried "npm i --save-dev @types/classnames", but there is still this error. Thanks!

My tsconfig:

{
  "compilerOptions": {
    "target": "ESNEXT",
    "module": "esnext",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "lib": [
      "dom",
      "dom.iterable",
      "esnext"
    ],
    "allowJs": true,
    "allowSyntheticDefaultImports": true,
    "noFallthroughCasesInSwitch": true,
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx"
  },
  "include": [
    "src"
  ]
}