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polylith-migrate-resolve-circular-imports

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[Internal sub-skill of `polylith-migrate-orchestrator`. Do not load directly — load `polylith-migrate-orchestrator` first, which drives all phases.] Resolve circular imports by updating imports in the new base location to avoid referencing the compatibility shim.

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Source SKILL.md: https://github.com/DavidVujic/python-polylith/blob/HEAD/.agents/skills/polylith/migrate-project/polylith-migrate-resolve-circular-imports/SKILL.md

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Skill: polylith-migrate-resolve-circular-imports

⛓ Conditional phase (4b). Runs only when SHIM_STRATEGY=shim (chosen in polylith-migrate-analyze-imports) and only if polylith-migrate-detect-circular-imports found cycles. Skipped on the shimless path. See the polylith-migrate-orchestrator workflow.

Goal

Resolve circular imports by updating imports in the new base location to avoid referencing the compatibility shim, ensuring a clean dependency graph.

Inputs

  • Project name (from migration/<project-name>/state.md)
  • Original namespace (from migration/<project-name>/state.md)
  • New namespace (from migration/<project-name>/state.md)
  • Circular imports report (from migration/<project-name>/circular_imports.md)

Steps

1. Review the circular imports report

  1. Review the circular imports report to identify all circular import chains.

2. Resolve circular imports

  1. For each circular import chain:
    • Update imports in the new base location (bases/${TARGET_TOP_NS}/${INITIAL_BASE_NAME}/) to avoid referencing the compatibility shim
    • Use direct imports from the new namespace instead
    • Consider using forward references or dependency injection where necessary

Example:

# Before (circular import with shim)
from myproject.core import MyClass

# After (direct import from new namespace)
from mynamespace.mybase.core import MyClass

3. Record resolved circular imports

  1. Record all resolved circular imports in migration/${PROJECT}/circular_imports_resolved.md.

Output

  • Updated files in the new base location
  • A report file: migration/<project-name>/circular_imports_resolved.md listing resolved circular imports

Verify

  1. Confirm that all circular imports listed in migration/<project-name>/circular_imports.md have been resolved.
  2. Verify that no circular imports remain by re-running the circular import detection.
  3. Ensure the codebase remains functional by running the test command from migration/<project-name>/state.md.

Commit

git add bases/${TARGET_TOP_NS}/${INITIAL_BASE_NAME}/
git add migration/${PROJECT}/circular_imports_resolved.md
git commit -m "migrate(${PROJECT}): phase <N> — resolve-circular-imports"

<N> is this phase's number from the polylith-migrate-orchestrator table (the single source of truth) — do not hardcode it.