How do I define a type which is already available globally?

I am using react with vite.js, I have typescript setup too, I have installed Jimp which is mainly made for node.js but has a minified script that you can load, I have loaded it in main.jsx like this:

...
import "jimp/browser/lib/jimp";
...

I am able to access it using window.Jimp or Jimp, it has same interface as import Jimp from "jimp" so I wanna declare Jimp as a global variable/constant as Jimp type, how do I do that? I have tried the following inside src/types/global.d.ts but did not work:

import Jimp from "jimp";

declare global {
  const Jimp: typeof Jimp;
}

My configurations:

tsconfig.json

{
  "files": [],
  "references": [
    {
      "path": "./tsconfig.app.json"
    },
    {
      "path": "./tsconfig.node.json"
    }
  ]
}

tsconfig.app.json

{
  "compilerOptions": {
    "composite": true,
    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
    "target": "ES2020",
    "useDefineForClassFields": true,
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "module": "ESNext",
    "skipLibCheck": true,

    /* Bundler mode */
    "moduleResolution": "bundler",
    "allowImportingTsExtensions": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "moduleDetection": "force",
    "noEmit": true,
    "jsx": "react-jsx",

    /* Linting */
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true,
  },
  "include": ["src"]
}

tsconfig.node.json

{
  "compilerOptions": {
    "composite": true,
    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
    "skipLibCheck": true,
    "module": "ESNext",
    "moduleResolution": "bundler",
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "noEmit": true
  },
  "include": ["vite.config.ts"]
}

I also have this .eslintrc.cjs:

module.exports = {
  root: true,
  env: { browser: true, es2020: true },
  extends: [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:react-hooks/recommended",
  ],
  ignorePatterns: ["dist", ".eslintrc.cjs"],
  parser: "@typescript-eslint/parser",
  plugins: ["react-refresh"],
  rules: {
    "react-refresh/only-export-components": [
      "warn",
      { allowConstantExport: true },
    ],
  },
}

Thanks!