---
layout: post
title: Fixing Nrwl Nx Monorepo Workspace Dependency Graph Error
date: 2021-03-06 00:00 +0000
subtitle: nx monorepo workspace tslint dependency error fix
description: nx monorepo workspace tslint dependency error fix
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# Fixing Nrwl Nx Monorepo Workspace Dependency Graph Error


> If you are working on `nx monorepo workspace` and if you have notice below error and want to fix it then read this article.
> <span style="color:red;">_"Error: A project without tags cannot depend on any libraries (nx-enforce-module-boundaries)"_</span>


## How dependency graph works in Nx Monorepo Workspace?

- Nx will create an inventory of project tags.
- Next Nx will compare all of the enforcement rules defined inside the tslint.json file.
- If Nx could not find any rule against a project tag inside the tslint.json file then it will throw error "A project without tags cannot depend on any libraries (nx-enforce-module-boundaries)"

Therefore, Projects without any tags cannot depend on any other projects.

## Project Tag for Apps are defined in Nx.json

In our nx.json file we do have the project tags for my application `onlinestore-admin`, `onlinestore-client`,`onlinestore-dashboard`


    "onlinestore-client": {
      "tags": ["scope:itops", "type:onlinestore-client"]
    },
    "onlinestore-admin": {
      "tags": ["scope:itops", "type:onlinestore-admin"]
    },
    "onlinestore-dashboard": {
      "tags": ["scope:itops", "type:onlinestore-dashboard"]
    },

## However, Dependency Constraints for App is Missing in Tslint.json

Inside the `tslint.json` file you can notice we do not have dependency constraints for our applications.

  "nx-enforce-module-boundaries": [
      true,
      {
        "enforceBuildableLibDependency": true,
        "allow": [],
        "depConstraints": [
          {
            "sourceTag": "scope:sales",
            "onlyDependOnLibsWithTags": ["scope:sales", "scope:branding"]
          },
          {
            "sourceTag": "type:sales-product-editor",
            "onlyDependOnLibsWithTags": [
              "type:sales-product-editor",
              "type:branding-logger",
              "type:branding-layout",
              "type:branding-ng-material"
            ]
          },
          {
            "sourceTag": "type:sales-products",
            "onlyDependOnLibsWithTags": [
              "type:sales-products",
              "type:branding-logger",
              "type:branding-layout",
              "type:branding-ng-material"
            ]
          },
          {
            "sourceTag": "scope:customers",
            "onlyDependOnLibsWithTags": ["scope:customers", "scope:branding"]
          },
          {
            "sourceTag": "type:customers-user-editor",
            "onlyDependOnLibsWithTags": [
              "type:customers-user-editor",
              "type:branding-logger",
              "type:branding-layout",
              "type:branding-ng-material"
            ]
          },
          {
            "sourceTag": "type:customers-users",
            "onlyDependOnLibsWithTags": [
              "type:customers-users",
              "type:branding-logger",
              "type:branding-layout",
              "type:branding-ng-material"
            ]
          },
          {
            "sourceTag": "scope:branding",
            "onlyDependOnLibsWithTags": ["scope:branding"]
          }
        ]
      }
    ],

So notice since nx is not able to find out any dependency constraints for the projects therefore, it is throwing error.

## Solution to Nx Dependency Graph Error

There are 2 options.

1. Either you can allow everyone to access every other projects by using `[*]`
If you add the following, projects without any tags will be able to depend on any other project.

{
  "sourceTag": "*",
  "onlyDependOnLibsWithTags": ["*"]
}

However, I would never recommend allowing all project to access other projects.

2. Recommended option is to add the dependency constraints for the application as well. We will explicitly define `onlinestore-client` and its dependencies.


 {
   "sourceTag": "type:onlinestore-client",
   "onlyDependOnLibsWithTags": [
     "type:sales-products",
     "type:customers-users",
     "type:branding-logger",
     "type:branding-layout",
     "type:branding-ng-material"
   ]
 },
 {
   "sourceTag": "type:onlinestore-admin",
   "onlyDependOnLibsWithTags": [
     "type:sales-product-editor",
     "type:customers-user-editor",
     "type:branding-logger",
     "type:branding-layout",
     "type:branding-ng-material"
   ]
 },

I did option 2 and notice my errors went away.

## Conclusion

Now you learned how to get rid of error "A project without tags cannot depend on any libraries (nx-enforce-module-boundaries)". If you want to setup dependency boundary within your nx monorepo workspace then consider reading this article: [NX Monorepo: Imposing Constraints on Dependency Graph](https://fullstackmaster.net/detail/blog/9 ) . Sometime you also want to restrict dependencies within your boundary or service. Read this article to learn how can you achieve [Enforcing Dependency Constraints Within a Service using Nx Monorepo](https://fullstackmaster.net/detail/blog/10)

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