Function collectFileMetrics

src/health/derive.ts:26–112

(chunks: CodeChunk[], graph: InternalFileGraph)

}

function collectFileMetrics(chunks: CodeChunk[], graph: InternalFileGraph): FileMetricsMap {
  const metrics = new Map<string, FileMetrics>();
  const graphJson = graph.toJSON();
  const reverseImports = new Map<string, Set<string>>();

  for (const [file, deps] of Object.entries(graphJson.imports)) {
    const normalizedFile = normalizePathLike(file);
    const fileMetrics = metrics.get(normalizedFile) ?? {
      importCount: 0,
      importerCount: 0,
      cycleCount: 0,
      maxCyclomaticComplexity: 0
    };
    fileMetrics.importCount = deps.length;
    metrics.set(normalizedFile, fileMetrics);

    for (const dependency of deps) {
      const normalizedDependency = normalizePathLike(dependency);
      const importers = reverseImports.get(normalizedDependency) ?? new Set<string>();
      importers.add(normalizedFile);
      reverseImports.set(normalizedDependency, importers);
    }
  }

  for (const [file, importers] of reverseImports.entries()) {
    const fileMetrics = metrics.get(file) ?? {
      importCount: 0,
      importerCount: 0,
      cycleCount: 0,
      maxCyclomaticComplexity: 0
    };
    fileMetrics.importerCount = importers.size;
    metrics.set(file, fileMetrics);
  }

  for (const chunk of chunks) {
    const file = normalizePathLike(chunk.relativePath || chunk.filePath);
    const fileMetrics = metrics.get(file) ?? {
      importCount: 0,
      importerCount: 0,
      cycleCount: 0,
      maxCyclomaticComplexity: 0
    };
    const chunkComplexity =
      typeof chunk.metadata?.cyclomaticComplexity === 'number'
        ? chunk.metadata.cyclomaticComplexity
        : typeof chunk.metadata?.complexity === 'number'
          ? chunk.metadata.complexity
          : 0;
    fileMetrics.maxCyclomaticComplexity = Math.max(
      fileMetrics.maxCyclomaticComplexity,
      chunkComplexity
    );
    metrics.set(file, fileMetrics);
  }

  const hotspotRanks = Array.from(metrics.entries())
    .map(([file, fileMetrics]) => ({