[GSAP not recognized in rollup bundle]

Hi, 

I am trying to bundle my React app as a npm package, to import it in another react app. It was working fine, but then I had to use gsap in my project and now the build of my app is not working anymore.
I use rollup to bundle my app and I get the following error :

[!] (plugin rpt2) RollupError: src/components/Background/Background.tsx:7:22 - error TS2307: Cannot find module 'gsap' or its corresponding type declarations.

7 import { gsap } from "gsap";
                       ~~~~~~
src/components/Background/Background.tsx:9:31 - error TS2307: Cannot find module 'gsap/ScrollTrigger' or its corresponding type declarations.

9 import { ScrollTrigger } from "gsap/ScrollTrigger";
                                ~~~~~~~~~~~~~~~~~~~~

Here is my rollup config :
 

import resolve from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import typescript from "rollup-plugin-typescript2";
import image from "@rollup/plugin-image";
import json from "@rollup/plugin-json";
import url from "rollup-plugin-url";
import { terser } from "rollup-plugin-terser";
import generatePackageJson from "rollup-plugin-generate-package-json";
import peerDepsExternal from "rollup-plugin-peer-deps-external";
import postcss from "rollup-plugin-postcss";
import replace from "@rollup/plugin-replace";

const config = [
  {
    input: "src/indexLib.tsx",
    output: [
      {
        file: "dist/index.js",
        format: "umd",
        sourcemap: true,
        name: "myapp",
      },
    ],
    plugins: [
      replace({
        "process.env.REACT_APP_BUILD_TARGET": JSON.stringify("npm"),
      }),
      peerDepsExternal(),
      resolve(),
      commonjs(),
      typescript({ tsconfig: "./tsconfig.json" }),
      postcss(),
      terser(),
      image(),
      json(),
      url({
        include: ["**/*.woff", "**/*.woff2", "**/*.mp4"],
        limit: Infinity,
      }),
      generatePackageJson({
        baseContents: (pkg) => ({
          name: pkg.name,
          main: "index.js",
          dependencies: {},
          version: `${pkg.version}${
            process.env.REACT_APP_ENV !== "PROD"
              ? // @ts-ignore
                `-beta.${pkg.betaVersion}`
              : ""
          }`,
          author: pkg.author,
          license: pkg.license,
        }),
      }),
    ],
    external: ["react", "react-dom", "styled-components"],
  },
];

export default config;

Here is my tsconfig :
 

{
  "compilerOptions": {
    "esModuleInterop": true,
    "strict": true,
    "skipLibCheck": true,
    "jsx": "react-jsx",
    "module": "ESNext",
    "sourceMap": true,
    "moduleResolution": "node",
    "allowSyntheticDefaultImports": true,
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true,
    "target": "es5",
    "lib": [
      "dom",
      "dom.iterable",
      "esnext"
    ],
    "allowJs": true,
    "noFallthroughCasesInSwitch": true,
    "outDir": "dist/",
    "isolatedModules": true,
    "noEmit": true,
    "typeRoots": [
      "./node_modules/@types",
      "./src/types"
    ]
  },
  "exclude": [
    "dist",
    "node_modules",
    "test-package-app",
    "build"
  ],
  "include": [
    "src"
  ]
}

Any help would be appreciated, I scrolled all the internet but found nothing, it seems that the problem comes from the rollup-plugin-typescript2 plugin, but it raises this error only with gsap module, everything else is working fine.