fix(dart): an import or export links the file its URI names, not a namesake

CHANGELOG.md

@@ -56,6 +56,7 @@ and adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 - In JavaScript and TypeScript, a store whose name starts or ends with a `$`, like `const items$ = create(…)`, now has its actions indexed when an `export { … }` list on a later line exports it, as in `export { items$ };` or `export { $items as default };`. Before, those actions were missing from the graph, so their callers and impact came back empty. A store whose name only lacks the `$`, like `items`, is no longer treated as exported by that list. Re-index JavaScript and TypeScript projects after upgrading.
 - In Dart, a comment inside a chain of calls no longer loses part of it: a call with a comment before its arguments, like `box.grow /* by */ (3)`, now links to the method it calls, and a getter read or a static access written after a comment, like `Config //` followed by `.instance` on the next line (the empty `//` keeps `dart format` from joining the lines), now counts as a use. Re-index Dart projects after upgrading.
 - In Dart, a call, a constructor call or a type written without a receiver now links only to a declaration the file can see: one in its own library (the file and its `part` files) or one exported by a library it imports, with `export` chains, `show`, `hide` and `as` prefixes followed the way Dart follows them. So a generated `.g.dart` file reaches its own library's function or type instead of a same-named one in a neighbouring file, a call to a package function such as `fakeAsync`, `runApp` or `unawaited` no longer links to an unrelated project function of that name, and a bare call is never taken for another type's enum value or static constant. Re-index Dart projects after upgrading.
+- In Dart, an `import` or `export` now links to the file it names: `package:my_app/src/cart.dart` to that package's `lib/src/cart.dart`, and a relative path to the file it points to from the importing file. Before, only the file name at the end was matched, so `import 'package:flutter/widgets.dart'` linked to whichever project file was called `widgets.dart`, and most imports of your own files didn't link to the file at all, which threw off `codegraph affected` and the files listed as using a file. An import of a Dart SDK library or of a package from outside your project now links nothing, and when packages in one repository share a name, the one the importing app depends on by `path:` is used. Re-index Dart projects after upgrading.
 
 ## [1.6.2] - 2026-10-03
 

__tests__/dart-import-uris.test.ts

@@ -0,0 +1,200 @@
+/**
+ * A Dart `import` / `export` names a library by URI, and links the file the
+ * URI names or nothing. `package:<name>/<path>` is `<root>/lib/<path>` of the
+ * project package whose pubspec.yaml says `name: <name>`; any other URI is a
+ * path from the importing file; `dart:` and a package from outside the project
+ * name no project file. The URI's last path segment is not a file name to
+ * match: riverpod's `import 'package:flutter/foundation.dart'` went to its own
+ * packages/riverpod/lib/src/core/foundation.dart, bloc_tools'
+ * `package:args/command_runner.dart` to the importing file itself, and the
+ * import of an indexed project file went to the importing file's own `import`
+ * node, which says nothing.
+ */
+import { describe, it, expect, afterAll, beforeAll } from 'vitest';
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+import { CodeGraph } from '../src';
+
+function writeTree(root: string, files: Record<string, string>): void {
+  for (const [rel, content] of Object.entries(files)) {
+    fs.mkdirSync(path.dirname(path.join(root, rel)), { recursive: true });
+    fs.writeFileSync(path.join(root, rel), content);
+  }
+}
+
+/** `<line> -> <target>` for every `imports` edge out of `file`: a file by its path, anything else by kind, file and name. */
+function importsFrom(cg: CodeGraph, file: string): string[] {
+  const ids = cg.getNodesInFile(file).map((n) => n.id);
+  return cg.getOutgoingEdgesFrom(ids, ['imports'])
+    .map((e) => {
+      const t = cg.getNode(e.target)!;
+      return `${e.line} -> ${t.kind === 'file' ? t.filePath : `${t.kind} ${t.filePath}#${t.name}`}`;
+    })
+    .sort();
+}
+
+/** The URIs of `file`'s imports left unresolved. */
+function unresolvedImportsOf(cg: CodeGraph, file: string): string[] {
+  const fileNode = cg.getNodesInFile(file).find((n) => n.kind === 'file')!;
+  return cg.getUnresolvedReferencesFrom(fileNode.id)
+    .filter((r) => r.referenceKind === 'imports')
+    .map((r) => r.referenceName)
+    .sort();
+}
+
+describe('Dart import and export URIs', () => {
+  let root = '';
+  let cg: CodeGraph;
+
+  beforeAll(async () => {
+    root = fs.mkdtempSync(path.join(os.tmpdir(), 'cg-dart-uris-'));
+    writeTree(root, {
+      // riverpod: an example app imports flutter's foundation.dart and the
+      // project's own riverpod package; riverpod has a foundation.dart too.
+      'packages/riverpod/pubspec.yaml': 'name: riverpod\n',
+      'packages/riverpod/lib/riverpod.dart': `export 'src/core/foundation.dart';
+export 'package:meta/meta.dart' show internal;
+`,
+      'packages/riverpod/lib/src/core/foundation.dart': `class ProviderBase {}
+`,
+      'packages/riverpod/lib/src/core/container.dart': `import 'dart:async';
+
+import 'package:meta/meta.dart';
+
+import 'foundation.dart';
+
+class Container extends ProviderBase {}
+`,
+      'examples/pub/pubspec.yaml': 'name: pub\n',
+      'examples/pub/lib/pub_repository.dart': `import 'package:flutter/foundation.dart';
+import 'package:riverpod/riverpod.dart';
+import 'package:riverpod/src/core/foundation.dart' as core;
+
+class PubRepository {}
+`,
+      // bloc_tools imports package:args' command_runner.dart from its own command_runner.dart.
+      'packages/bloc_tools/pubspec.yaml': 'name: bloc_tools\n',
+      'packages/bloc_tools/lib/src/command_runner.dart': `import 'package:args/command_runner.dart';
+
+class BlocToolsCommandRunner {}
+`,
+      // An integration test imports package:integration_test; a driver beside it is named integration_test.dart.
+      'examples/flutter_counter/pubspec.yaml': 'name: flutter_counter\n',
+      'examples/flutter_counter/integration_test/app_test.dart': `import 'package:integration_test/integration_test.dart';
+
+void main() {}
+`,
+      'examples/flutter_counter/test_driver/integration_test.dart': `import 'package:integration_test/integration_test_driver.dart';
+
+Future<void> main() async {}
+`,
+      // A relative import, and an old file with the same name.
+      'pubspec.yaml': 'name: app\n',
+      'test/src/utils.dart': `int errorsOf() => 0;
+`,
+      'test/old/utils.dart': `int errorsOf() => 0;
+`,
+      'test/feature/uni_directional_test.dart': `import '../src/utils.dart';
+
+void main() {}
+`,
+      // A translated copy of a docs page whose sibling was never translated.
+      'website/docs/cancel/detail_screen/codegen.dart': `class DetailScreen {}
+`,
+      'website/i18n/it/cancel/home_screen.dart': `import 'detail_screen/codegen.dart';
+
+class HomeScreen {}
+`,
+      // Two apps each keep a package named auth_repo, and each app's pubspec says which by path.
+      'examples/login_a/pubspec.yaml': `name: login_a
+dependencies:
+  auth_repo:
+    # the app's own copy
+    path: packages/auth_repo
+  bloc: ^9.0.0
+`,
+      'examples/login_a/packages/auth_repo/pubspec.yaml': 'name: auth_repo\n',
+      'examples/login_a/packages/auth_repo/lib/auth_repo.dart': `class AuthRepo {}
+`,
+      'examples/login_a/lib/app.dart': `import 'package:auth_repo/auth_repo.dart';
+
+class AppA {}
+`,
+      'examples/login_b/pubspec.yaml': `name: login_b
+dependencies:
+  auth_repo: { path: "packages/auth_repo" }
+`,
+      'examples/login_b/packages/auth_repo/pubspec.yaml': 'name: auth_repo\n',
+      'examples/login_b/packages/auth_repo/lib/auth_repo.dart': `class AuthRepo {}
+`,
+      'examples/login_b/lib/app.dart': `import 'package:auth_repo/auth_repo.dart';
+
+class AppB {}
+`,
+      // A third app says nothing about which auth_repo it means.
+      'examples/login_c/pubspec.yaml': 'name: login_c\n',
+      'examples/login_c/lib/app.dart': `import 'package:auth_repo/auth_repo.dart';
+
+class AppC {}
+`,
+      // Packages named example: each one's own package: imports mean itself.
+      'packages/a/example/pubspec.yaml': 'name: example\n',
+      'packages/a/example/lib/main.dart': `import 'package:example/src/screen.dart';
+
+void main() {}
+`,
+      'packages/a/example/lib/src/screen.dart': `class ScreenA {}
+`,
+      'packages/b/example/pubspec.yaml': 'name: example\n',
+      'packages/b/example/lib/src/screen.dart': `class ScreenB {}
+`,
+      // A package import of a file the project doesn't have (a generated file nobody committed).
+      'packages/riverpod/lib/src/missing_user.dart': `import 'package:riverpod/src/core/foundation.g.dart';
+import 'package:riverpod/src/missing_user.dart';
+`,
+    });
+    cg = await CodeGraph.init(root, { index: true });
+  });
+
+  afterAll(() => {
+    cg?.close();
+    if (root) fs.rmSync(root, { recursive: true, force: true });
+  });
+
+  it("links an outside package's import to no project file of the same name", () => {
+    expect(importsFrom(cg, 'examples/pub/lib/pub_repository.dart')).toEqual([
+      '2 -> packages/riverpod/lib/riverpod.dart',
+      '3 -> packages/riverpod/lib/src/core/foundation.dart',
+    ]);
+    expect(unresolvedImportsOf(cg, 'examples/pub/lib/pub_repository.dart')).toEqual(['package:flutter/foundation.dart']);
+  });
+
+  it('never links a file to itself or a namesake for an outside package', () => {
+    expect(importsFrom(cg, 'packages/bloc_tools/lib/src/command_runner.dart')).toEqual([]);
+    expect(importsFrom(cg, 'examples/flutter_counter/integration_test/app_test.dart')).toEqual([]);
+    expect(importsFrom(cg, 'examples/flutter_counter/test_driver/integration_test.dart')).toEqual([]);
+  });
+
+  it('links a relative import and an export to the file they name, and dart: or outside packages to nothing', () => {
+    expect(importsFrom(cg, 'packages/riverpod/lib/src/core/container.dart')).toEqual([
+      '5 -> packages/riverpod/lib/src/core/foundation.dart',
+    ]);
+    expect(unresolvedImportsOf(cg, 'packages/riverpod/lib/src/core/container.dart')).toEqual(['dart:async', 'package:meta/meta.dart']);
+    expect(importsFrom(cg, 'packages/riverpod/lib/riverpod.dart')).toEqual(['1 -> packages/riverpod/lib/src/core/foundation.dart']);
+    expect(importsFrom(cg, 'test/feature/uni_directional_test.dart')).toEqual(['1 -> test/src/utils.dart']);
+  });
+
+  it('links nothing when the file a URI names is not in the project', () => {
+    expect(importsFrom(cg, 'website/i18n/it/cancel/home_screen.dart')).toEqual([]);
+    // Nor does a file's import of itself say anything.
+    expect(importsFrom(cg, 'packages/riverpod/lib/src/missing_user.dart')).toEqual([]);
+  });
+
+  it("tells same-named packages apart by the importing package's own name or its path dependency", () => {
+    expect(importsFrom(cg, 'examples/login_a/lib/app.dart')).toEqual(['1 -> examples/login_a/packages/auth_repo/lib/auth_repo.dart']);
+    expect(importsFrom(cg, 'examples/login_b/lib/app.dart')).toEqual(['1 -> examples/login_b/packages/auth_repo/lib/auth_repo.dart']);
+    expect(importsFrom(cg, 'examples/login_c/lib/app.dart')).toEqual([]);
+    expect(importsFrom(cg, 'packages/a/example/lib/main.dart')).toEqual(['1 -> packages/a/example/lib/src/screen.dart']);
+  });
+});

src/resolution/dart-libraries.ts

@@ -14,7 +14,9 @@
  * pubspec.yaml says `name: <name>`: the nearest pubspec.yaml above an indexed
  * .dart file, never above the project root. When packages share a name
  * (example apps), the importing file's own package wins, then the one
- * enclosing it, else all of them count.
+ * enclosing it, then the one its package depends on by `path:`, else all of
+ * them count. An `import` / `export` edge links the one file its URI names
+ * (`dartDirectiveFile`).
  *
  * Directives are read from the head of each file at resolution time;
  * extraction, and the kernel's, are unchanged. Where the library cannot be
@@ -357,6 +359,8 @@ interface Memo {
   directives: Map<string, DartDirectives | null>;
   packageOfDir: Map<string, PubPackage | null>;
   packages: Map<string, PubPackage[]> | null;
+  /** By package root and dependency name, the directories its `path:` dependencies of that name point at. */
+  pathDependencies: Map<string, readonly string[]>;
   libraryNames: Map<string, string[]> | null;
   libraryOf: Map<string, string | null>;
   /** A part's parent: the file its `part of` names. */
@@ -375,6 +379,7 @@ function memoFor(context: ResolutionContext): Memo {
       directives: new Map(),
       packageOfDir: new Map(),
       packages: null,
+      pathDependencies: new Map(),
       libraryNames: null,
       libraryOf: new Map(),
       parentOf: new Map(),
@@ -450,6 +455,62 @@ function packagesNamed(name: string, context: ResolutionContext, memo: Memo): re
   return memo.packages.get(name) ?? [];
 }
 
+/**
+ * The `path:` a pubspec gives its dependency `name`, written as a block
+ * (`name:`, then `path: x` below it) or a flow mapping (`name: {path: x}`).
+ * A git dependency's `path:` (inside its `git:` mapping) is a path in that
+ * repository, so only `path:` directly under the name counts.
+ */
+function yamlPathDependencies(text: string, name: string): string[] {
+  const out: string[] = [];
+  const lines = text.split(/\r?\n/);
+  for (let i = 0; i < lines.length; i++) {
+    const key = /^([ \t]+)(['"]?)([A-Za-z_]\w*)\2[ \t]*:(?:[ \t]+(.*))?$/.exec(lines[i]!);
+    if (!key || key[3] !== name) continue;
+    const value = (key[4] ?? '').replace(/(?:^|[ \t])#.*$/, '').trim();
+    if (value !== '') {
+      const flow = /^\{[^{}]*\}$/.test(value)
+        ? /[{,][ \t]*path[ \t]*:[ \t]*(?:"([^"]*)"|'([^']*)'|([^,}\s]+))/.exec(value)
+        : null;
+      if (flow) out.push(flow[1] ?? flow[2] ?? flow[3]!);
+      continue;
+    }
+    let childIndent = -1;
+    for (let j = i + 1; j < lines.length; j++) {
+      const line = lines[j]!;
+      if (/^[ \t]*(?:#.*)?$/.test(line)) continue;
+      const indent = /^[ \t]*/.exec(line)![0].length;
+      if (indent <= key[1]!.length) break;
+      if (childIndent < 0) childIndent = indent;
+      const dep = indent === childIndent ? /^[ \t]*path[ \t]*:[ \t]*(?:"([^"]*)"|'([^']*)'|([^\s#]+))/.exec(line) : null;
+      if (dep) out.push(dep[1] ?? dep[2] ?? dep[3]!);
+    }
+  }
+  return out;
+}
+
+/** The project directories `pkg`'s pubspec_overrides.yaml and pubspec.yaml give as the `path:` of its dependency `name`. */
+function pathDependencies(pkg: PubPackage, name: string, context: ResolutionContext, memo: Memo): readonly string[] {
+  const key = `${pkg.root}\0${name}`;
+  const hit = memo.pathDependencies.get(key);
+  if (hit) return hit;
+  const dirs: string[] = [];
+  for (const file of ['pubspec_overrides.yaml', 'pubspec.yaml']) {
+    const pubspec = pkg.root ? `${pkg.root}/${file}` : file;
+    const text = context.fileExists(pubspec) ? context.readFile(pubspec) : null;
+    for (const written of text ? yamlPathDependencies(text, name) : []) {
+      const dep = written.replace(/\\/g, '/');
+      if (dep.startsWith('/') || /^[A-Za-z]:/.test(dep)) continue;
+      const dir = path.posix.normalize(path.posix.join(pkg.root || '.', dep)).replace(/\/+$/, '');
+      if (dir === '..' || dir.startsWith('../')) continue;
+      const root = dir === '.' ? '' : dir;
+      if (!dirs.includes(root)) dirs.push(root);
+    }
+  }
+  memo.pathDependencies.set(key, dirs);
+  return dirs;
+}
+
 /** The project files a URI written in `from` names: none for `dart:` and other schemes, or a package outside the project. */
 function resolveDartUri(from: string, uri: string, context: ResolutionContext, memo: Memo): string[] {
   if (uri.startsWith('package:')) {
@@ -463,6 +524,13 @@ function resolveDartUri(from: string, uri: string, context: ResolutionContext, m
       const enclosing = chosen.filter((p) => p.root === '' || from.startsWith(`${p.root}/`));
       if (own && own.name === name) chosen = [own];
       else if (enclosing.length > 0) chosen = [enclosing.reduce((a, b) => (b.root.length > a.root.length ? b : a))];
+      else if (own) {
+        // Example apps that each keep a same-named package (bloc's two
+        // authentication_repository) name theirs as a path dependency.
+        const dirs = pathDependencies(own, name, context, memo);
+        const declared = chosen.filter((p) => dirs.includes(p.root));
+        if (declared.length === 1) chosen = declared;
+      }
     }
     return chosen.map((p) => path.posix.normalize(p.root ? `${p.root}/lib/${rest}` : `lib/${rest}`));
   }
@@ -471,6 +539,16 @@ function resolveDartUri(from: string, uri: string, context: ResolutionContext, m
   return joined === '..' || joined.startsWith('../') || joined.startsWith('/') ? [] : [joined];
 }
 
+/**
+ * The project file a Dart `import` or `export` in `from` names by `uri`, or
+ * null: a `dart:` library, a package from outside the project, a path out of
+ * it, or a package name the project repeats with nothing to say which.
+ */
+export function dartDirectiveFile(from: string, uri: string, context: ResolutionContext): string | null {
+  const files = resolveDartUri(from, uri, context, memoFor(context));
+  return files.length === 1 ? files[0]! : null;
+}
+
 /** The files declaring `library <name>;`. */
 function libraryFilesNamed(name: string, context: ResolutionContext, memo: Memo): readonly string[] {
   if (!memo.libraryNames) {

src/resolution/import-resolver.ts

@@ -12,6 +12,7 @@ import { applyAliases } from './path-aliases';
 import { extractLocalExportAliases } from './alias-binding';
 import { resolveWorkspaceImport } from './workspace-packages';
 import { stripCommentsForRegex } from './strip-comments';
+import { dartDirectiveFile } from './dart-libraries';
 import {
   resolveMethodOnType,
   resolveObjectLiteralMember,
@@ -892,6 +893,17 @@ export function isCobolCopybookRef(ref: UnresolvedRef): boolean {
   return ref.language === 'cobol' && ref.referenceKind === 'imports';
 }
 
+/**
+ * Is this a Dart `import` / `export`? Its name is the URI, which names one
+ * library file (see ./dart-libraries) or none — `dart:async`, a package from
+ * outside the project — and never a symbol: the name-matcher took the URI's
+ * last segment for a file name (`package:flutter/foundation.dart` went to
+ * riverpod's own foundation.dart) or bound it to the file's own `import` node.
+ */
+export function isDartImportRef(ref: UnresolvedRef): boolean {
+  return ref.language === 'dart' && ref.referenceKind === 'imports';
+}
+
 /**
  * Resolve a PHP include/require path to a project-relative file path.
  *
@@ -1639,6 +1651,13 @@ export function resolveViaImport(
     const fileNode = file && file !== ref.filePath ? context.getNodesInFile(file).find((n) => n.kind === 'file') : undefined;
     if (fileNode) return { original: ref, targetNodeId: fileNode.id, confidence: 0.9, resolvedBy: 'import' };
   }
+  // A Dart `import` / `export` URI names a library file: `package:app/x.dart`
+  // is app's lib/x.dart, any other path is from the importing file.
+  if (isDartImportRef(ref)) {
+    const file = dartDirectiveFile(ref.filePath, ref.referenceName, context);
+    const fileNode = file && file !== ref.filePath ? context.getNodesInFile(file).find((n) => n.kind === 'file') : undefined;
+    return fileNode ? { original: ref, targetNodeId: fileNode.id, confidence: 0.9, resolvedBy: 'import' } : null;
+  }
   // C/C++ #include references — resolve directly to the included file
   // (file→file edge), bypassing symbol lookup. The extractor emits these
   // with `referenceKind: 'imports'` and `referenceName: <include path>`