Class CodeGraph

src/index.ts:144–2374

 * Provides the primary interface for interacting with the code knowledge graph.
 */
export class CodeGraph {
  private db: DatabaseConnection;
  private queries: QueryBuilder;
  private projectRoot: string;
  // Assigned via wireLayers() from the constructor (and again on reopen) — the
  // `!` tells TS these are definitely set even though the assignment is one
  // method call away from the constructor body.
  private orchestrator!: ExtractionOrchestrator;
  private resolver!: ReferenceResolver;
  private graphManager!: GraphQueryManager;
  private traverser!: GraphTraverser;
  private contextBuilder!: ContextBuilder;

  // Mutex for preventing concurrent indexing operations (in-process)
  private indexMutex = new Mutex();

  // File lock for preventing concurrent writes across processes (CLI, MCP, git hooks)
  private fileLock: FileLock;

  // File watcher for auto-sync on file changes
  private watcher: FileWatcher | null = null;

  private constructor(
    db: DatabaseConnection,
    queries: QueryBuilder,
    projectRoot: string
  ) {
    this.db = db;
    this.queries = queries;
    this.projectRoot = projectRoot;
    this.fileLock = new FileLock(
      path.join(getCodeGraphDir(projectRoot), 'codegraph.lock')
    );
    this.wireLayers();
  }

  /**
   * (Re)build the query/extraction/graph layers over the current `this.queries`
   * (which wraps `this.db`). Factored out of the constructor so `reopenIfReplaced`
   * can rebuild them against a fresh connection without duplicating the wiring.
   * The path-based `fileLock` is independent of the DB handle, so it stays put.
   */
  private wireLayers(): void {
    // Down-weight the project name as a query term in search ranking — it names
    // the whole repo, not a symbol, so it has no discriminative value (#720).
    try {
      this.queries.setProjectNameTokens(deriveProjectNameTokens(this.projectRoot));
    } catch {
      // Best-effort: ranking still works without it.
    }
    // Down-weight the peripheral trees the project named in `codegraph.json`
    // `deprioritize` — indexed and findable, but never outranking real code
    // (#982). Ranking-only, so a bad pattern costs relevance, never recall.
    //
    // Read LAZILY, not once here: `wireLayers` runs from the constructor and
    // from `reopenIfReplaced`, so a matcher built here would freeze at whatever
    // the config said when the project opened. The MCP server caches one
    // CodeGraph per root for its whole lifetime, so editing `codegraph.json`