feat(cdk-experimental/tree): add tree directives, example, and tests (#31350)

Author: ok7sai

.ng-dev/commit-message.mts

@@ -19,6 +19,7 @@ export const commitMessage: CommitMessageConfig = {
     'cdk-experimental/selection',
     'cdk-experimental/table-scroll-container',
     'cdk-experimental/tabs',
+    'cdk-experimental/tree',
     'cdk-experimental/ui-patterns',
     'cdk/a11y',
     'cdk/accordion',

src/cdk-experimental/config.bzl

@@ -10,6 +10,7 @@ CDK_EXPERIMENTAL_ENTRYPOINTS = [
     "scrolling",
     "selection",
     "tabs",
+    "tree",
     "table-scroll-container",
     "ui-patterns",
 ]

src/cdk-experimental/tree/BUILD.bazel

@@ -0,0 +1,37 @@
+load("//tools:defaults.bzl", "ng_project", "ng_web_test_suite", "ts_project")
+
+package(default_visibility = ["//visibility:public"])
+
+ng_project(
+    name = "tree",
+    srcs = [
+        "index.ts",
+        "public-api.ts",
+        "tree.ts",
+    ],
+    deps = [
+        "//src/cdk-experimental/deferred-content",
+        "//src/cdk-experimental/ui-patterns",
+        "//src/cdk/a11y",
+        "//src/cdk/bidi",
+    ],
+)
+
+ts_project(
+    name = "unit_test_sources",
+    testonly = True,
+    srcs = [
+        "tree.spec.ts",
+    ],
+    deps = [
+        ":tree",
+        "//:node_modules/@angular/core",
+        "//:node_modules/@angular/platform-browser",
+        "//src/cdk/testing/private",
+    ],
+)
+
+ng_web_test_suite(
+    name = "unit_tests",
+    deps = [":unit_test_sources"],
+)

src/cdk-experimental/tree/index.ts

@@ -0,0 +1,9 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+export * from './public-api';

src/cdk-experimental/tree/public-api.ts

@@ -0,0 +1,9 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+export {CdkTreeItemGroup, CdkTreeItemGroupContent, CdkTree, CdkTreeItem} from './tree';