TypeScript error: Duplicate identifier 'LibraryManagedAttributes'

Question

Failed to compile.

/moonholdings.io/node_modules/@types/react-dom/node_modules/@types/react/index.d.ts (2312,14): Duplicate identifier \'LibraryManagedAt

Answer 1

I'm still not sure what caused that bug, however I've checked out a much earlier version of my app, where it was stable. So going to continue work from there.

Here is the working package.json

{
  "name": "moonholdings.io",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "start": "react-scripts-ts start",
    "build": "react-scripts-ts build",
    "test": "react-scripts-ts test --env=jsdom",
    "eject": "react-scripts-ts eject"
  },
  "dependencies": {
    "@types/jest": "^23.3.1",
    "@types/node": "^10.9.4",
    "@types/react": "^16.4.13",
    "@types/react-dom": "^16.0.7",
    "react": "^16.4.2",
    "react-dom": "^16.4.2",
    "react-ts-with-scss": "2.1.0",
    "typescript": "^3.0.3"
  },
  "devDependencies": {}
}

Answer 2

I had the same error. I upgraded @types/react and @types/react-dom to their latest versions in package.json and it fixed my error.

Not sure why @types/react-dom is defined in your devDependencies instead of your dependencies, that might fix it as well...

Answer 3

You may find that the duplicates are located in node_modules/@types/react and node_modules/types/react-dom/@types/react or a similar set-up, in which one of the packages has a nested dependency on the other.

Uninstalling and reinstalling @types/react-dom and @types/react together is what fixed it for me.

yarn remove @types/react-dom @types/react


yarn add -D @types/react-dom @types/react