Can't import module using package.json "exports" in React

I am trying to import a (typescript) package into a (typescript) React project. This modules uses the exports property in the package.json file to control what can be imported from it. But, in my React project, I can not get the paths exported in exports to work. Instead, I can import anything from the module. So for example, I export a path ./certificate using exports in package.json. But instead of importing like:

import {test} from "certificationtypes/certificate"

I need to import like:

import {test} from "certificationtypes/src/certificate"

(It also exposes all other files not exported using the exports directive).

This is the package.json of the module:

{
  "name": "inputsvalidator",
  "version": "1.0.0",
  "description": "",
  "main": "./build/src/index.js",
  "exports": {
    "./certificate": "./build/src/certificate.js"
  },
  "scripts": {
    "build": "tsc",
    "prepare": "npm run build",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "devDependencies": {
    "typescript": "^4.9.4"
  },
  "dependencies": {
    "@types/validator": "^13.7.10",
    "certificationtypes": "file:../certificationTypes",
    "countries": "file:../../../../../lib/shared/countries",
    "types": "file:../../../../../lib/shared/types",
    "validator": "^13.7.0"
  }
}

The strange thing is that this does work in Node.js projects! So is there something extra I should do to also make this work in my React project? I did read that this should be supported using webpack.

My package.json for my React project:

{
  "name": "front-end",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.16.5",
    "@testing-library/react": "^13.4.0",
    "@testing-library/user-event": "^13.5.0",
    "@types/jest": "^27.5.2",
    "@types/node": "^16.18.11",
    "@types/react": "^18.0.26",
    "@types/react-dom": "^18.0.10",
    "certificationtypes": "file:../../lib/shared/certificationTypes",
    "countries": "file:../../../../lib/shared/countries",
    "inputsvalidator": "file:../../lib/shared/inputsValidator",
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
    "react-scripts": "5.0.1",
    "react-spinners": "^0.13.7",
    "styled-components": "^5.3.6",
    "typescript": "^4.9.4",
    "validator": "^13.7.0",
    "web-vitals": "^2.1.4"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "@types/styled-components": "^5.1.26"
  },
  "proxy": "http://localhost:3003"
}

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