71 lines
6.0 KiB
Markdown
71 lines
6.0 KiB
Markdown
---
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title: Enforce Module Boundaries ESLint Rule
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description: Learn how to use the @nx/enforce-module-boundaries ESLint rule to define strict rules for accessing resources between different projects in your Nx workspace.
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---
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# Enforce module boundaries rule
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The `@nx/enforce-module-boundaries` ESLint rule enables you to define strict rules for accessing resources between
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different projects in the repository. Enforcing strict boundaries helps to prevent unplanned cross-dependencies.
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## Usage
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You can use the `enforce-module-boundaries` rule by adding it to your ESLint rules configuration:
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```jsonc
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{
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// ... more ESLint config here
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"overrides": [
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{
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"files": ["*.ts", "*.tsx", "*.js", "*.jsx"],
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"rules": {
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"@nx/enforce-module-boundaries": [
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"error",
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{
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// ...rule specific configuration
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}
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]
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}
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}
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// ... more ESLint overrides here
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]
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}
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```
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## Options
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| Property | Type | Default | Description |
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| ---------------------------------- | ------------------------- | ------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| allow | _Array<string>_ | _[]_ | List of imports that should be allowed without any checks |
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| allowCircularSelfDependency | _boolean_ | _false_ | Disable check for self circular dependency when project imports from itself via alias path |
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| banTransitiveDependencies | _boolean_ | _false_ | Ban import of dependencies that were not specified in the root or project's `package.json` |
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| ignoredCircularDependencies | _Array<[string, string]>_ | _[]_ | List of project pairs that should be skipped from `Circular dependencies` checks, including the self-circular dependency check. E.g. `['feature-project-a', 'myapp']`. Project name can be replaced by catch all `*` for more generic matches. |
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| checkDynamicDependenciesExceptions | _Array<string>_ | _[]_ | List of imports that should be skipped for `Imports of lazy-loaded libraries forbidden` checks. E.g. `['@myorg/lazy-project/component/*', '@myorg/other-project']` |
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| checkNestedExternalImports | _boolean_ | _false_ | Enable to enforce the check for banned external imports in the nested packages. Check [Dependency constraints](#dependency-constraints) for more information |
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| enforceBuildableLibDependency | _boolean_ | _false_ | Enable to restrict the buildable libs from importing non-buildable libraries |
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| depConstraints | _Array<object>_ | _[]_ | List of dependency constraints between projects |
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### Dependency constraints
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The `depConstraints` is an array of objects representing the constraints defined between source and target projects. A
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constraint must include `sourceTag` or `allSourceTags`. The constraints are applied with **AND** logical operation - for
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a given `source` project the resulting constraints would be **all** that match its tags.
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| Property | Type | Description |
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| ------------------------ | --------------- | ---------------------------------------------------------------------------------- |
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| sourceTag | _string_ | Tag that source project must contain to match the constraint |
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| allSourceTags | _Array<string>_ | List of tags the source project must contain to match the constraint |
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| onlyDependOnLibsWithTags | _Array<string>_ | The source **can depend only** on projects that contain at least one of these tags |
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| notDependOnLibsWithTags | _Array<string>_ | The source **can not depend** on projects that contain at least one of these tags |
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| allowedExternalImports | _Array<string>_ | Exclusive list of external (npm) packages that are allowed to be imported |
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| bannedExternalImports | _Array<string>_ | List of external (npm) packages that are banned from importing |
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Read more about the proper usage of this rule:
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- [Enforce Module Boundaries](/features/enforce-module-boundaries)
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- [Ban Dependencies with Certain Tags](/recipes/enforce-module-boundaries/ban-dependencies-with-tags)
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- [Tag in Multiple Dimensions](/recipes/enforce-module-boundaries/tag-multiple-dimensions)
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- [Ban External Imports](/recipes/enforce-module-boundaries/ban-external-imports)
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- [Tags Allow List](/recipes/enforce-module-boundaries/tags-allow-list)
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- [Taming Code Organization with Module Boundaries in Nx](/blog/mastering-the-project-boundaries-in-nx)
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