# 5. Import extraction per cluster

**Date:** 2026-07-03

**Status:** Accepted

## Context

An LLM prompted with a behavioral convention like `every → assertEquals → verify` still needs to know *which imports to use*. Without imports, it will guess the wrong library — writing `from unittest.mock import patch` instead of `import io.mockk.every`, or importing from `jest` instead of `vitest`.

Imports are the bridge between abstract conventions and actionable code.

## Decision

For each cluster, scan the source files whose methods belong to that cluster and extract all unique import lines.

Language-agnostic approach: match lines against common import patterns:
- `import ...` (Java, Kotlin, Python, Go, JS/TS)
- `from ... import ...` (Python)
- `require ...` / `require_relative ...` (Ruby, JS)
- `#include ...` (C/C++)
- `use ...` (Rust)
- `include ...` (Ruby)

Scan the first 200 lines of each file (imports are always at the top), deduplicate across files, yielding stable file-visit order (files sorted by path).

File-to-cluster mapping is preserved by tracking `(file_path, sequence)` pairs through the pipeline. With multi-assignment clustering, methods may belong to multiple clusters — each gets the full import set from its source file.

## Consequences

**Positive:**
- Each cluster shows exact import lines used by its methods.
- An LLM can copy these directly — no guessing.
- Reveals *library choice conventions*: `kotlin.test.*` vs `org.junit.jupiter.api.*`, `io.mockk.coEvery` vs `io.mockk.every`.

**Negative:**
- Import scanning re-reads files (second pass). Negligible cost since files are small and OS-cached.
- 200-line scan limit might miss imports in files with very long license headers.
- Lines containing `import` in prose (comments, strings) may produce false positives — rare in practice.

## Alternatives Considered

- **Single global import list**: Simpler but useless — conflates imports from unrelated clusters.
- **No imports**: LLM must guess. Leads to wrong imports and broken code.
- **Per-file imports (not per-cluster)**: Too granular — mixes test imports with production imports in the same file.