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Stop Updating Monorepo CI Path Filters by Hand

Use your monorepo’s existing dependency model to select CI tasks affected by Git changes instead of maintaining a separate list of package path filters.
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Replace per-package CI path lists with affected-task selection from the build system your monorepo already uses. The tool compares Git changes with the repository’s project or package relationships, then selects relevant tasks—including downstream dependents when a shared component changes. This removes a separate, easy-to-forget mapping from workflow files; it does not guarantee that every run will be smaller.

Why path filters miss the impact of a change

A workflow path filter answers a narrow question: did a changed file match one of these patterns? It does not inherently know that an application imports a shared library in another directory. If that library changes, a filter listing only the library’s path may skip the application’s tests or build.

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Affected-task selection combines two pieces of information: the changed-file range in Git and a project or package relationship model. The tool maps changes to projects and can select tasks for projects that depend on them. The relationship model is what makes this different from maintaining a longer list of globs. See Nx’s explanation of affected selection and Turborepo’s CI guidance.

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Choose the affected command for your existing build system

Start with the monorepo tool already used to define projects, packages, and tasks. Adding a second system just to avoid path filters can create another model to maintain.

Approach Best fit How it selects work Key check
Nx nx affected A workspace already modeled in Nx Uses Git changes and the Nx project graph to select affected projects or tasks. Provide the intended base and head SHAs, enough Git history, and accurate project relationships and task inputs/outputs. Nx GitHub Actions integration; Nx affected tasks.
Turborepo --affected or Git filters A workspace already using Turborepo Selects changed packages and can include packages that depend on them. Confirm the comparison base resolves to the intended branch or commit for the CI event. Turborepo CI guidance; filter syntax reference.
Handwritten path filters Small workflows with deliberately isolated paths Matches file patterns at the workflow or job level; it does not provide dependency awareness by itself. Keep the patterns aligned with shared dependencies. This approach becomes fragile when impact crosses directory boundaries.

How to replace the filters without weakening CI

  1. Inventory the existing model. Identify the monorepo tool, the projects or packages it knows about, and the tasks that currently run behind path conditions. If a workflow’s path list contains special cases for shared code, record what those cases are meant to protect.
  2. Use the tool’s affected mechanism for those tasks. In Nx, the documented GitHub Actions example runs nx affected -t lint test build. Nx also documents generating a workflow starting point with nx g @nx/workspace:ci-workflow --ci=github. Treat generated configuration as a starting point: review its triggers, permissions, and comparison behavior for your repository. See Nx GitHub Actions integration and Nx CI setup guidance.
  3. Set the comparison range for each CI event. Pull requests and pushes need a base and head that represent the change you intend to evaluate. Nx’s GitHub Actions guidance notes that affected calculation needs Git history and base/head SHAs. For Turborepo, check that the base used by --affected or a Git filter resolves to the intended integration branch or commit. A wrong or unavailable base can produce a selection that does not match the change under review.
  4. Check what the tool considers an input and dependency. Verify that project relationships and task inputs and outputs represent how your repository actually builds and tests. Include repository-specific cases such as shared libraries, root configuration, lockfiles, generated inputs, and cross-project task dependencies where they apply; their effects are not universal and should be checked against your graph and task definitions. Nx documents graph and input/output considerations in its affected-task guidance.
  5. Validate selections before making them required checks. Compare the selected projects and tasks against expected results for representative changes: a package-local edit, a shared-library edit, and a repository-level configuration or dependency-file edit relevant to your setup. Confirm that dependent apps are included when expected and unrelated projects are not selected without reason.
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What to expect when shared code changes

A broadly used shared project can legitimately make many—or most—projects affected. The purpose is to select work based on declared impact, not to promise fewer tasks for every commit. Likewise, affected selection cannot compensate for missing dependency relationships or inaccurate task inputs and outputs: the tool can only reason from the repository model it has.

Handwritten path filters can still suit intentionally isolated workflows. But when a change in one directory can affect work in another, an affected-task mechanism keeps the selection logic tied to the project model instead of duplicating that logic as workflow globs.

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