Force ng update or clean repository rerun for Angular upgrade recovery?

When an Angular ng update aborts because of peer‑dependency conflicts, the choice between ng update --force and a clean rerun hinges on three factors: speed, long‑term stability, and the state of your local repository.

Likely explanation

The --force flag tells the CLI to ignore peer‑dependency errors and install the requested versions anyway. This can finish the upgrade in seconds, but the resulting dependency graph may mismatch Angular schematics or other libraries. Runtime errors often surface later, especially when components rely on schematic‑generated code or when other packages expect specific peer versions.

Confirmed facts

A clean rerun (revert the failed update, resolve the conflicting library, then run ng update without --force) produces a dependency graph that respects Angular’s compatibility matrix. This approach is slower because it requires identifying and upgrading the offending package, but it minimizes the risk of post‑upgrade incompatibilities. If the repository contains uncommitted local changes, they must be stashed or committed before a clean rerun; otherwise the CLI may apply changes unpredictably or fail entirely.

Assumption: The Angular compatibility matrix applies as documented for the installed CLI version. Uncertainty: Exact runtime behavior may vary with transitive peer dependencies.

1. Run ng update --dry-run to see the planned version changes and identify the peer‑dependency source.
2. If time permits, revert any partial update using version control, then upgrade the conflicting library manually or via ng update <library>.
3. Rerun ng update <packages> without --force to apply a verified, schematic‑compatible set of versions.
4. Execute the project’s test suite and a manual smoke test to catch runtime errors.
5. If you must finish quickly and have a smoke‑test pipeline, ng update --force is acceptable, provided you verify the resulting package.json against the Angular compatibility matrix and run the full test suite immediately after.

Missing diagnostic detail: Do you have uncommitted local changes in the repository? This determines whether the clean‑rerun path is feasible without merge complications. If yes, stash or commit those changes before proceeding with the clean rerun.