feat(impact): persist import edge details + 2-hop impact candidates

.gitignore

@@ -1,4 +1,5 @@
 node_modules/
+.pnpm-store/
 dist/
 .codebase-index/
 .codebase-index.json

src/cli-formatters.ts

@@ -206,11 +206,11 @@
   lines.push('');
 
   const boxLines = drawBox('Team Patterns', lines, BOX_WIDTH);
   console.log('');
   for (const l of boxLines) {
     console.log(l);
   }
   console.log('');
 }
 
 export function formatSearch(
@@ -269,7 +269,14 @@
     if (impact?.coverage) {
       boxLines.push(`Callers: ${impact.coverage}`);
     }
-    if (impact?.files && impact.files.length > 0) {
+    if (impact?.details && impact.details.length > 0) {
+      const shown = impact.details.slice(0, 3).map((d) => {
+        const p = shortPath(d.file, rootPath);
+        const suffix = d.line ? `:${d.line}` : '';
+        return `${p}${suffix} (hop ${d.hop})`;
+      });
+      boxLines.push(`Files:   ${shown.join(', ')}`);
+    } else if (impact?.files && impact.files.length > 0) {
       const shown = impact.files.slice(0, 3).map((f) => shortPath(f, rootPath));
       boxLines.push(`Files:   ${shown.join(', ')}`);
     }
@@ -289,17 +296,17 @@
   const boxTitle =
     titleParts.length > 0 ? `Search: ${titleParts.join(' \u2500\u2500\u2500 ')}` : 'Search';
 
   console.log('');
   if (boxLines.length > 0) {
     const boxOut = drawBox(boxTitle, boxLines, BOX_WIDTH);
     for (const l of boxOut) {
       console.log(l);
     }
     console.log('');
   } else if (quality) {
     const status = quality.status === 'ok' ? 'ok' : 'low confidence';
     console.log(`  ${results?.length ?? 0} results  ·  quality: ${status}`);
     console.log('');
   }
 
   if (results && results.length > 0) {
@@ -315,8 +322,8 @@
       if (typePart) metaParts.push(typePart);
       if (trendPart) metaParts.push(trendPart);
 
       console.log(`${i + 1}.  ${file}`);
       console.log(`    ${metaParts.join(' \u00b7 ')}`);
 
       const summary = r.summary ?? '';
       if (summary) {

src/core/indexer.ts

@@ -515,7 +515,7 @@ export class CodebaseIndexer {
                   }
                 }
 
-                internalFileGraph.trackImport(file, resolvedPath, imp.imports);
+                internalFileGraph.trackImport(file, resolvedPath, imp.line || 1, imp.imports);
               }
             }
 
@@ -856,6 +856,7 @@ export class CodebaseIndexer {
         generatedAt,
         graph: {
           imports: graphData.imports || {},
+          ...(graphData.importDetails ? { importDetails: graphData.importDetails } : {}),
           importedBy,
           exports: graphData.exports || {}
         },

src/tools/search-codebase.ts

@@ -27,6 +27,7 @@ import { RELATIONSHIPS_FILENAME } from '../constants/codebase-context.js';
 interface RelationshipsData {
   graph?: {
     imports?: Record<string, string[]>;
+    importDetails?: Record<string, Record<string, { line?: number; importedSymbols?: string[] }>>;
   };
   stats?: unknown;
 }
@@ -280,6 +281,35 @@ export async function handle(
     return null;
   }
 
+  type ImportEdgeDetail = { line?: number; importedSymbols?: string[] };
+  type ImportDetailsGraph = Record<string, Record<string, ImportEdgeDetail>>;
+
+  function getImportDetailsGraph(): ImportDetailsGraph | null {
+    if (relationships?.graph?.importDetails) {
+      return relationships.graph.importDetails as ImportDetailsGraph;
+    }
+    const internalDetails = intelligence?.internalFileGraph?.importDetails;
+    if (internalDetails) {
+      return internalDetails as ImportDetailsGraph;
+    }
+    return null;
+  }
+
+  function normalizeGraphPath(filePath: string): string {
+    const normalized = filePath.replace(/\\/g, '/');
+    if (path.isAbsolute(filePath)) {
+      const rel = path.relative(ctx.rootPath, filePath).replace(/\\/g, '/');
+      if (rel && !rel.startsWith('..')) {
+        return rel;
+      }
+    }
+    return normalized.replace(/^\.\//, '');
+  }
+
+  function pathsMatch(a: string, b: string): boolean {
+    return a === b || a.endsWith(b) || b.endsWith(a);
+  }
+
   function computeIndexConfidence(): 'fresh' | 'aging' | 'stale' {
     let confidence: 'fresh' | 'aging' | 'stale' = 'stale';
     if (intelligence?.generatedAt) {
@@ -294,21 +324,92 @@ export async function handle(
     return confidence;
   }
 
-  // Cheap impact breadth estimate from the import graph (used for risk assessment).
-  function computeImpactCandidates(resultPaths: string[]): string[] {
-    const impactCandidates: string[] = [];
+  type ImpactCandidate = { file: string; line?: number; hop: 1 | 2 };
+
+  function findImportDetail(
+    details: ImportDetailsGraph | null,
+    importer: string,
+    imported: string
+  ): ImportEdgeDetail | null {
+    if (!details) return null;
+    const edges = details[importer];
+    if (!edges) return null;
+    if (edges[imported]) return edges[imported];
+
+    let bestKey: string | null = null;
+    for (const depKey of Object.keys(edges)) {
+      if (!pathsMatch(depKey, imported)) continue;
+      if (!bestKey || depKey.length > bestKey.length) {
+        bestKey = depKey;
+      }
+    }
+
+    return bestKey ? edges[bestKey] : null;
+  }
+
+  // Impact breadth estimate from the import graph (used for risk assessment).
+  // 2-hop: direct importers (hop 1) + importers of importers (hop 2).
+  function computeImpactCandidates(resultPaths: string[]): ImpactCandidate[] {
     const allImports = getImportsGraph();
-    if (!allImports) return impactCandidates;
-    for (const [file, deps] of Object.entries(allImports)) {
-      if (
-        deps.some((dep: string) => resultPaths.some((rp) => dep.endsWith(rp) || rp.endsWith(dep)))
-      ) {
-        if (!resultPaths.some((rp) => file.endsWith(rp) || rp.endsWith(file))) {
-          impactCandidates.push(file);
+    if (!allImports) return [];
+
+    const importDetails = getImportDetailsGraph();
+
+    const reverseImportsLocal = new Map<string, string[]>();
+    for (const [file, deps] of Object.entries<string[]>(allImports)) {
+      for (const dep of deps) {
+        if (!reverseImportsLocal.has(dep)) reverseImportsLocal.set(dep, []);
+        reverseImportsLocal.get(dep)!.push(file);
+      }
+    }
+
+    const targets = resultPaths.map((rp) => normalizeGraphPath(rp));
+    const targetSet = new Set(targets);
+
+    const candidates = new Map<string, ImpactCandidate>();
+
+    const addCandidate = (file: string, hop: 1 | 2, line?: number): void => {
+      if (Array.from(targetSet).some((t) => pathsMatch(t, file))) return;
+
+      const existing = candidates.get(file);
+      if (existing) {
+        if (existing.hop <= hop) return;
+      }
+      candidates.set(file, { file, hop, ...(line ? { line } : {}) });
+    };
+
+    const collectImporters = (
+      target: string
+    ): Array<{ importer: string; detail: ImportEdgeDetail | null }> => {
+      const matches: Array<{ importer: string; detail: ImportEdgeDetail | null }> = [];
+      for (const [dep, importers] of reverseImportsLocal) {
+        if (!pathsMatch(dep, target)) continue;
+        for (const importer of importers) {
+          matches.push({ importer, detail: findImportDetail(importDetails, importer, dep) });
         }
       }
+      return matches;
+    };
+
+    // Hop 1
+    const hop1Files: string[] = [];
+    for (const target of targets) {
+      for (const { importer, detail } of collectImporters(target)) {
+        addCandidate(importer, 1, detail?.line);
+      }
+    }
+    for (const candidate of candidates.values()) {
+      if (candidate.hop === 1) hop1Files.push(candidate.file);
     }
-    return impactCandidates;
+
+    // Hop 2
+    for (const mid of hop1Files) {
+      for (const { importer, detail } of collectImporters(mid)) {
+        addCandidate(importer, 2, detail?.line);
+      }
+    }
+
+    return Array.from(candidates.values()).slice(0, 20);
   }
 
   // Build reverse import map from relationships sidecar (preferred) or intelligence graph
@@ -673,12 +774,18 @@ export async function handle(
 
         // Add impact (coverage + top 3 files)
         if (impactCoverage || impactCandidates.length > 0) {
-          const impactObj: { coverage?: string; files?: string[] } = {};
+          const impactObj: {
+            coverage?: string;
+            files?: string[];
+            details?: Array<{ file: string; line?: number; hop: 1 | 2 }>;
+          } = {};
           if (impactCoverage) {
             impactObj.coverage = `${impactCoverage.covered}/${impactCoverage.total} callers in results`;
           }
           if (impactCandidates.length > 0) {
-            impactObj.files = impactCandidates.slice(0, 3);
+            const top = impactCandidates.slice(0, 3);
+            impactObj.files = top.map((candidate) => candidate.file);
+            impactObj.details = top;
           }
           if (Object.keys(impactObj).length > 0) {
             decisionCard.impact = impactObj;

src/tools/types.ts

@@ -13,6 +13,7 @@ export interface DecisionCard {
   impact?: {
     coverage?: string;
     files?: string[];
+    details?: Array<{ file: string; line?: number; hop: 1 | 2 }>;
   };
   whatWouldHelp?: string[];
 }

src/types/index.ts

@@ -647,6 +647,7 @@ export interface IntelligenceData {
   /** Opaque — consumed via InternalFileGraph.fromJSON */
   internalFileGraph?: {
     imports?: Record<string, string[]>;
+    importDetails?: Record<string, Record<string, { line?: number; importedSymbols?: string[] }>>;
     exports?: Record<string, unknown[]>;
     stats?: unknown;
   };

src/utils/usage-tracker.ts

@@ -622,13 +622,20 @@ export interface UnusedExport {
   exports: string[];
 }
 
+export interface ImportEdgeDetail {
+  line?: number;
+  importedSymbols?: string[];
+}
+
 export class InternalFileGraph {
   // Map: normalized file path -> Set of normalized file paths it imports
   private imports: Map<string, Set<string>> = new Map();
   // Map: normalized file path -> exports from that file
   private exports: Map<string, FileExport[]> = new Map();
   // Map: normalized file path -> Set of what symbols are imported from this file
   private importedSymbols: Map<string, Set<string>> = new Map();
+  // Map: fromFile -> toFile -> edge details (line/symbols)
+  private importDetails: Map<string, Map<string, ImportEdgeDetail>> = new Map();
   // Root path for relative path conversion
   private rootPath: string;
 
@@ -663,7 +670,12 @@ export class InternalFileGraph {
    * Track that importingFile imports importedFile
    * Both should be absolute paths; they will be normalized internally.
    */
-  trackImport(importingFile: string, importedFile: string, importedSymbols?: string[]): void {
+  trackImport(
+    importingFile: string,
+    importedFile: string,
+    line?: number,
+    importedSymbols?: string[]
+  ): void {
     const fromFile = this.normalizePath(importingFile);
     const toFile = this.normalizePath(importedFile);
 
@@ -674,15 +686,43 @@ export class InternalFileGraph {
 
     this.imports.get(fromFile)!.add(toFile);
 
-    // Track which symbols are imported from the target file
-    if (importedSymbols && importedSymbols.length > 0) {
+    const normalizedLine =
+      typeof line === 'number' && Number.isFinite(line) && line > 0 ? Math.floor(line) : undefined;
+
+    const normalizedSymbols =
+      importedSymbols && importedSymbols.length > 0
+        ? importedSymbols.filter((sym) => sym !== '*' && sym !== 'default')
+        : [];
+
+    if (normalizedLine || normalizedSymbols.length > 0) {
+      if (!this.importDetails.has(fromFile)) {
+        this.importDetails.set(fromFile, new Map());
+      }
+      const detailsForFrom = this.importDetails.get(fromFile)!;
+      const existing = detailsForFrom.get(toFile) ?? {};
+
+      const mergedLine =
+        existing.line && normalizedLine
+          ? Math.min(existing.line, normalizedLine)
+          : (existing.line ?? normalizedLine);
+
+      const mergedSymbolsSet = new Set<string>(existing.importedSymbols ?? []);
+      for (const sym of normalizedSymbols) mergedSymbolsSet.add(sym);
+      const mergedSymbols = Array.from(mergedSymbolsSet);
+
+      detailsForFrom.set(toFile, {
+        ...(mergedLine ? { line: mergedLine } : {}),
+        ...(mergedSymbols.length > 0 ? { importedSymbols: mergedSymbols.sort() } : {})
+      });
+    }
+
+    // Track which symbols are imported from the target file (for unused export detection)
+    if (normalizedSymbols.length > 0) {
       if (!this.importedSymbols.has(toFile)) {
         this.importedSymbols.set(toFile, new Set());
       }
-      for (const sym of importedSymbols) {
-        if (sym !== '*' && sym !== 'default') {
-          this.importedSymbols.get(toFile)!.add(sym);
-        }
+      for (const sym of normalizedSymbols) {
+        this.importedSymbols.get(toFile)!.add(sym);
       }
     }
   }
@@ -824,6 +864,7 @@ export class InternalFileGraph {
   toJSON(): {
     imports: Record<string, string[]>;
     exports: Record<string, FileExport[]>;
+    importDetails?: Record<string, Record<string, ImportEdgeDetail>>;
     stats: { files: number; edges: number; avgDependencies: number };
   } {
     const imports: Record<string, string[]> = {};
@@ -836,7 +877,25 @@ export class InternalFileGraph {
       exports[file] = exps;
     }
 
-    return { imports, exports, stats: this.getStats() };
+    const importDetails: Record<string, Record<string, ImportEdgeDetail>> = {};
+    for (const [fromFile, edges] of this.importDetails.entries()) {
+      const nested: Record<string, ImportEdgeDetail> = {};
+      for (const [toFile, detail] of edges.entries()) {
+        if (!detail.line && (!detail.importedSymbols || detail.importedSymbols.length === 0))
+          continue;
+        nested[toFile] = detail;
+      }
+      if (Object.keys(nested).length > 0) {
+        importDetails[fromFile] = nested;
+      }
+    }
+
+    return {
+      imports,
+      exports,
+      ...(Object.keys(importDetails).length > 0 ? { importDetails } : {}),
+      stats: this.getStats()
+    };
   }
 
   /**
@@ -846,6 +905,7 @@ export class InternalFileGraph {
     data: {
       imports?: Record<string, string[]>;
       exports?: Record<string, FileExport[]>;
+      importDetails?: Record<string, Record<string, ImportEdgeDetail>>;
     },
     rootPath: string
   ): InternalFileGraph {
@@ -863,6 +923,27 @@ export class InternalFileGraph {
       }
     }
 
+    if (data.importDetails) {
+      for (const [fromFile, edges] of Object.entries(data.importDetails)) {
+        const edgeMap = new Map<string, ImportEdgeDetail>();
+        for (const [toFile, detail] of Object.entries(edges ?? {})) {
+          edgeMap.set(toFile, detail);
+
+          if (detail.importedSymbols && detail.importedSymbols.length > 0) {
+            if (!graph.importedSymbols.has(toFile)) {
+              graph.importedSymbols.set(toFile, new Set());
+            }
+            for (const sym of detail.importedSymbols) {
+              graph.importedSymbols.get(toFile)!.add(sym);
+            }
+          }
+        }
+        if (edgeMap.size > 0) {
+          graph.importDetails.set(fromFile, edgeMap);
+        }
+      }
+    }
+
     return graph;
   }
 }