Add `hook/` to strict dependencies check (#4364)

lib/src/validator.dart

diff --git a/lib/src/validator.dart b/lib/src/validator.dart
index 112b90b..fa204ec 100644
--- a/lib/src/validator.dart
+++ b/lib/src/validator.dart
@@ -216,15 +216,17 @@
     });
   }
 
-  /// Returns the [files] that are inside [dir] (relative to the package
-  /// entrypoint).
+  /// Returns the [files] that are [path] or inside [path] (relative to the
+  /// package entrypoint).
   // TODO(sigurdm): Consider moving this to a more central location.
-  List<String> filesBeneath(String dir, {required bool recursive}) {
-    final base = p.canonicalize(p.join(package.dir, dir));
+  List<String> filesBeneath(String path, {required bool recursive}) {
+    final base = p.canonicalize(p.join(package.dir, path));
     return files
         .where(
           recursive
-              ? (file) => p.isWithin(base, p.canonicalize(file))
+              ? (file) =>
+                  p.isWithin(base, p.canonicalize(file)) ||
+                  p.canonicalize(file) == base
               : (file) => p.canonicalize(p.dirname(file)) == base,
         )
         .toList();

lib/src/validator/strict_dependencies.dart

diff --git a/lib/src/validator/strict_dependencies.dart b/lib/src/validator/strict_dependencies.dart
index c0a203a..362fcb9 100644
--- a/lib/src/validator/strict_dependencies.dart
+++ b/lib/src/validator/strict_dependencies.dart
@@ -65,17 +65,22 @@
   Future validate() async {
     final dependencies = package.dependencies.keys.toSet()..add(package.name);
     final devDependencies = MapKeySet(package.devDependencies);
-    _validateLibBin(dependencies, devDependencies);
+    _validateLibBinHook(dependencies, devDependencies);
     _validateBenchmarkTestTool(dependencies, devDependencies);
   }
 
-  /// Validates that no Dart files in `lib/` or `bin/` have dependencies that
-  /// aren't in [deps].
+  /// Validates that no Dart files in `lib/`, `bin/`, `hook/build.dart`, or
+  /// `hook/link.dart` have dependencies that aren't in [deps].
   ///
   /// The [devDeps] are used to generate special warnings for files that import
   /// dev dependencies.
-  void _validateLibBin(Set<String> deps, Set<String> devDeps) {
-    for (var usage in _usagesBeneath(['lib', 'bin'])) {
+  void _validateLibBinHook(Set<String> deps, Set<String> devDeps) {
+    for (var usage in _usagesBeneath([
+      'bin',
+      'hook/build.dart',
+      'hook/link.dart',
+      'lib',
+    ])) {
       if (!deps.contains(usage.package)) {
         if (devDeps.contains(usage.package)) {
           errors.add(usage.dependencyMisplaceMessage());

test/validator/strict_dependencies_test.dart

diff --git a/test/validator/strict_dependencies_test.dart b/test/validator/strict_dependencies_test.dart
index 155f326..9c0a5d7 100644
--- a/test/validator/strict_dependencies_test.dart
+++ b/test/validator/strict_dependencies_test.dart
@@ -282,6 +282,56 @@
       );
     });
 
+    test('hook does not declare an "import" as a dependency', () async {
+      await d.dir(
+        p.join(appPath, 'hook'),
+        [
+          d.file('build.dart', r'''
+        import 'package:silly_monkey/silly_monkey.dart';
+      '''),
+        ],
+      ).create();
+
+      await expectValidationDeprecated(
+        strictDeps,
+        errors: [
+          matches('does not have silly_monkey in the `dependencies` section'),
+        ],
+      );
+    });
+
+    test('hook declares an import as a devDependency for', () async {
+      await d.dir(
+        appPath,
+        [
+          d.libPubspec(
+            'test_pkg',
+            '1.0.0',
+            devDeps: {'silly_monkey': '^1.2.3'},
+            sdk: '>=1.8.0 <2.0.0',
+          ),
+          d.dir(
+            'hook',
+            [
+              d.file('build.dart', r'''
+        import 'package:silly_monkey/silly_monkey.dart';
+      '''),
+            ],
+          ),
+        ],
+      ).create();
+
+      await expectValidationDeprecated(
+        strictDeps,
+        errors: [
+          matches(
+            'silly_monkey is in the `dev_dependencies` section of '
+            '`pubspec.yaml`',
+          ),
+        ],
+      );
+    });
+
     test('does not declare an "export" as a dependency', () async {
       await d.file(p.join(appPath, 'lib', 'library.dart'), r'''
         export 'package:silly_monkey/silly_monkey.dart';