From c1cabbb01d9d5895b914440abe80938774418010 Mon Sep 17 00:00:00 2001
From: Jeremy Nimmer <jeremy.nimmer@tri.global>
Date: Thu, 22 Aug 2024 10:58:20 -0700
Subject: [PATCH] [topology] Tidy up bazel library spelling (#21841)

---
 multibody/plant/BUILD.bazel                 |  2 +-
 multibody/topology/BUILD.bazel              | 16 +++++++++++-----
 multibody/tree/BUILD.bazel                  |  4 ++--
 tools/install/libdrake/build_components.bzl |  2 +-
 4 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/multibody/plant/BUILD.bazel b/multibody/plant/BUILD.bazel
index 459efaf9ac41..7291bcd09405 100644
--- a/multibody/plant/BUILD.bazel
+++ b/multibody/plant/BUILD.bazel
@@ -147,7 +147,7 @@ drake_cc_library(
         "//multibody/contact_solvers/sap",
         "//multibody/fem",
         "//multibody/hydroelastics:hydroelastic_engine",
-        "//multibody/topology:multibody_topology",
+        "//multibody/topology",
         "//multibody/tree",
         "//systems/framework:diagram_builder",
         "//systems/framework:leaf_system",
diff --git a/multibody/topology/BUILD.bazel b/multibody/topology/BUILD.bazel
index ad2eed7593ee..692d4469d9fd 100644
--- a/multibody/topology/BUILD.bazel
+++ b/multibody/topology/BUILD.bazel
@@ -6,12 +6,18 @@ load(
     "drake_cc_package_library",
 )
 
-package(
-    default_visibility = ["//visibility:public"],
+package(default_visibility = ["//visibility:private"])
+
+drake_cc_package_library(
+    name = "topology",
+    visibility = ["//visibility:public"],
+    deps = [
+        ":impl",
+    ],
 )
 
 drake_cc_library(
-    name = "multibody_topology",
+    name = "impl",
     srcs = [
         "link_joint_graph.cc",
         "link_joint_graph_debug.cc",
@@ -44,7 +50,7 @@ drake_cc_library(
 drake_cc_googletest(
     name = "link_joint_graph_test",
     deps = [
-        ":multibody_topology",
+        ":impl",
         "//common/test_utilities:expect_throws_message",
     ],
 )
@@ -52,7 +58,7 @@ drake_cc_googletest(
 drake_cc_googletest(
     name = "spanning_forest_test",
     deps = [
-        ":multibody_topology",
+        ":impl",
         "//common:temp_directory",
         "//common/test_utilities:expect_throws_message",
     ],
diff --git a/multibody/tree/BUILD.bazel b/multibody/tree/BUILD.bazel
index fa6a916b1a1a..63f506b1f83d 100644
--- a/multibody/tree/BUILD.bazel
+++ b/multibody/tree/BUILD.bazel
@@ -49,7 +49,7 @@ drake_cc_library(
     ],
     deps = [
         ":multibody_tree_indexes",
-        "//multibody/topology:multibody_topology",
+        "//multibody/topology",
     ],
 )
 
@@ -183,7 +183,7 @@ drake_cc_library(
         "//common:string_container",
         "//common:unused",
         "//math:geometric_transform",
-        "//multibody/topology:multibody_topology",
+        "//multibody/topology",
         "//systems/framework:leaf_system",
     ],
 )
diff --git a/tools/install/libdrake/build_components.bzl b/tools/install/libdrake/build_components.bzl
index 024a58a221d7..e9118d43da14 100644
--- a/tools/install/libdrake/build_components.bzl
+++ b/tools/install/libdrake/build_components.bzl
@@ -70,7 +70,7 @@ LIBDRAKE_COMPONENTS = [
     "//multibody/plant",
     "//multibody/plant:contact_results_to_lcm",  # unpackaged
     "//multibody/rational",
-    "//multibody/topology:multibody_topology",  # unpackaged
+    "//multibody/topology",
     "//multibody/tree",
     "//multibody/triangle_quadrature",
     "//perception",