Duplicate “graphql” modules cannot be used at the same time since different versions may have different capabilities and behaviour

Duplicate “graphql” modules cannot be used at the same time since different versions may have different capabilities and behavior

If you are working with TypeScript and have encountered the error message “Duplicate ‘graphql’ modules cannot be used at the same time since different versions may have different capabilities and behavior,” don’t worry, you’re not alone. This error occurs when you have multiple versions of the ‘graphql’ module installed in your project, and TypeScript is unable to determine which one to use.

Fortunately, there are a few solutions to this problem:

1. Remove Duplicate ‘graphql’ Modules

The simplest solution is to remove the duplicate ‘graphql’ modules from your project. To do this, you need to identify where the duplicate modules are coming from. You can use the following command to list all the installed ‘graphql’ modules:

npm ls graphql

This command will display a tree-like structure of all the installed modules and their dependencies. Look for any duplicate entries of ‘graphql’ and note down their paths.

Once you have identified the duplicate modules, you can remove them using the following command:

npm uninstall 

Replace with the actual path to the duplicate module you want to remove.

2. Use a Single Version of ‘graphql’

If you have multiple dependencies that require different versions of ‘graphql’, you can try using a single version of ‘graphql’ throughout your project. To do this, you need to update the versions of the conflicting dependencies in your package.json file.

First, identify the dependencies that require different versions of ‘graphql’. You can use the following command to list all the dependencies and their versions:

npm ls --depth=0

Look for any dependencies that have different versions of ‘graphql’ listed. Note down their names.

Next, update the versions of these dependencies in your package.json file to use a single version of ‘graphql’. For example:

{
  "dependencies": {
    "dependency1": "^1.0.0",
    "dependency2": "^2.0.0",
    "graphql": "^3.0.0"
  }
}

Replace the version numbers with the desired version of ‘graphql’ that is compatible with all the dependencies.

3. Use TypeScript Path Mapping

If you have multiple versions of ‘graphql’ installed in your project for a specific reason and cannot remove them, you can use TypeScript path mapping to specify which version to use.

In your tsconfig.json file, add a paths property and specify the path mapping for ‘graphql’. For example:

{
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "graphql": ["node_modules/graphql/dist"]
    }
  }
}

This configuration tells TypeScript to use the ‘graphql’ module from the specified path instead of searching for it in the node_modules directory.

By using one of these solutions, you should be able to resolve the “Duplicate ‘graphql’ modules cannot be used at the same time” error in your TypeScript project.

Happy coding!