Use one mutator for all bp2build conversion.

Each conversion required defining a separate mutator, which will each
operate on _all_ modules and requires each to repeat checks whether the
mutator should operator. Instead, we introduce a single mutator and
modules can define a ConvertWithBp2build to implement bp2build
conversion for that module.

Test: bp2build.sh
Bug: 183079158
Change-Id: I99d4b51f441c2903879092c5b56313d606d4338d
diff --git a/bp2build/android_app_certificate_conversion_test.go b/bp2build/android_app_certificate_conversion_test.go
index 6a53b00..035a352 100644
--- a/bp2build/android_app_certificate_conversion_test.go
+++ b/bp2build/android_app_certificate_conversion_test.go
@@ -31,11 +31,10 @@
 
 func TestAndroidAppCertificateSimple(t *testing.T) {
 	runAndroidAppCertificateTestCase(t, bp2buildTestCase{
-		description:                        "Android app certificate - simple example",
-		moduleTypeUnderTest:                "android_app_certificate",
-		moduleTypeUnderTestFactory:         java.AndroidAppCertificateFactory,
-		moduleTypeUnderTestBp2BuildMutator: java.AndroidAppCertificateBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "Android app certificate - simple example",
+		moduleTypeUnderTest:        "android_app_certificate",
+		moduleTypeUnderTestFactory: java.AndroidAppCertificateFactory,
+		filesystem:                 map[string]string{},
 		blueprint: `
 android_app_certificate {
         name: "com.android.apogee.cert",
diff --git a/bp2build/android_app_conversion_test.go b/bp2build/android_app_conversion_test.go
index b12b567..153817b 100644
--- a/bp2build/android_app_conversion_test.go
+++ b/bp2build/android_app_conversion_test.go
@@ -31,10 +31,9 @@
 
 func TestMinimalAndroidApp(t *testing.T) {
 	runAndroidAppTestCase(t, bp2buildTestCase{
-		description:                        "Android app - simple example",
-		moduleTypeUnderTest:                "android_app",
-		moduleTypeUnderTestFactory:         java.AndroidAppFactory,
-		moduleTypeUnderTestBp2BuildMutator: java.AppBp2Build,
+		description:                "Android app - simple example",
+		moduleTypeUnderTest:        "android_app",
+		moduleTypeUnderTestFactory: java.AndroidAppFactory,
 		filesystem: map[string]string{
 			"app.java":            "",
 			"res/res.png":         "",
@@ -58,10 +57,9 @@
 
 func TestAndroidAppAllSupportedFields(t *testing.T) {
 	runAndroidAppTestCase(t, bp2buildTestCase{
-		description:                        "Android app - all supported fields",
-		moduleTypeUnderTest:                "android_app",
-		moduleTypeUnderTestFactory:         java.AndroidAppFactory,
-		moduleTypeUnderTestBp2BuildMutator: java.AppBp2Build,
+		description:                "Android app - all supported fields",
+		moduleTypeUnderTest:        "android_app",
+		moduleTypeUnderTestFactory: java.AndroidAppFactory,
 		filesystem: map[string]string{
 			"app.java":                     "",
 			"resa/res.png":                 "",
diff --git a/bp2build/apex_conversion_test.go b/bp2build/apex_conversion_test.go
index 64440df..a3825e6 100644
--- a/bp2build/apex_conversion_test.go
+++ b/bp2build/apex_conversion_test.go
@@ -43,11 +43,10 @@
 
 func TestApexBundleSimple(t *testing.T) {
 	runApexTestCase(t, bp2buildTestCase{
-		description:                        "apex - example with all props",
-		moduleTypeUnderTest:                "apex",
-		moduleTypeUnderTestFactory:         apex.BundleFactory,
-		moduleTypeUnderTestBp2BuildMutator: apex.ApexBundleBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "apex - example with all props",
+		moduleTypeUnderTest:        "apex",
+		moduleTypeUnderTestFactory: apex.BundleFactory,
+		filesystem:                 map[string]string{},
 		blueprint: `
 apex_key {
 	name: "com.android.apogee.key",
@@ -147,11 +146,10 @@
 
 func TestApexBundleDefaultPropertyValues(t *testing.T) {
 	runApexTestCase(t, bp2buildTestCase{
-		description:                        "apex - default property values",
-		moduleTypeUnderTest:                "apex",
-		moduleTypeUnderTestFactory:         apex.BundleFactory,
-		moduleTypeUnderTestBp2BuildMutator: apex.ApexBundleBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "apex - default property values",
+		moduleTypeUnderTest:        "apex",
+		moduleTypeUnderTestFactory: apex.BundleFactory,
+		filesystem:                 map[string]string{},
 		blueprint: `
 apex {
 	name: "com.android.apogee",
@@ -166,11 +164,10 @@
 
 func TestApexBundleHasBazelModuleProps(t *testing.T) {
 	runApexTestCase(t, bp2buildTestCase{
-		description:                        "apex - has bazel module props",
-		moduleTypeUnderTest:                "apex",
-		moduleTypeUnderTestFactory:         apex.BundleFactory,
-		moduleTypeUnderTestBp2BuildMutator: apex.ApexBundleBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "apex - has bazel module props",
+		moduleTypeUnderTest:        "apex",
+		moduleTypeUnderTestFactory: apex.BundleFactory,
+		filesystem:                 map[string]string{},
 		blueprint: `
 apex {
 	name: "apogee",
diff --git a/bp2build/apex_key_conversion_test.go b/bp2build/apex_key_conversion_test.go
index 17f79a6..1d949901 100644
--- a/bp2build/apex_key_conversion_test.go
+++ b/bp2build/apex_key_conversion_test.go
@@ -31,11 +31,10 @@
 
 func TestApexKeySimple(t *testing.T) {
 	runApexKeyTestCase(t, bp2buildTestCase{
-		description:                        "apex key - simple example",
-		moduleTypeUnderTest:                "apex_key",
-		moduleTypeUnderTestFactory:         apex.ApexKeyFactory,
-		moduleTypeUnderTestBp2BuildMutator: apex.ApexKeyBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "apex key - simple example",
+		moduleTypeUnderTest:        "apex_key",
+		moduleTypeUnderTestFactory: apex.ApexKeyFactory,
+		filesystem:                 map[string]string{},
 		blueprint: `
 apex_key {
         name: "com.android.apogee.key",
diff --git a/bp2build/build_conversion_test.go b/bp2build/build_conversion_test.go
index 95a26a9..1440b6f 100644
--- a/bp2build/build_conversion_test.go
+++ b/bp2build/build_conversion_test.go
@@ -245,7 +245,7 @@
 		{
 			description: "string props",
 			blueprint: `custom {
-	name: "foo",
+  name: "foo",
     string_list_prop: ["a", "b"],
     string_ptr_prop: "a",
     bazel_module: { bp2build_available: true },
@@ -470,7 +470,7 @@
 			android.FailIfErrored(t, err)
 
 			if actualCount, expectedCount := len(bazelTargets), len(testCase.expectedBazelTargets); actualCount != expectedCount {
-				t.Errorf("Expected %d bazel target, got %d", expectedCount, actualCount)
+				t.Errorf("Expected %d bazel target (%s),\ngot %d (%s)", expectedCount, testCase.expectedBazelTargets, actualCount, bazelTargets)
 			} else {
 				for i, expectedBazelTarget := range testCase.expectedBazelTargets {
 					actualBazelTarget := bazelTargets[i]
@@ -596,6 +596,7 @@
 		{
 			bp: `custom {
     name: "bar",
+    one_to_many_prop: true,
     bazel_module: { bp2build_available: true  },
 }`,
 			expectedBazelTarget: `my_library(
@@ -620,7 +621,6 @@
 		config := android.TestConfig(buildDir, nil, testCase.bp, nil)
 		ctx := android.NewTestContext(config)
 		ctx.RegisterModuleType("custom", customModuleFactory)
-		ctx.RegisterBp2BuildMutator("custom", customBp2BuildMutatorFromStarlark)
 		ctx.RegisterForBazelConversion()
 
 		_, errs := ctx.ParseFileList(dir, []string{"Android.bp"})
@@ -658,10 +658,9 @@
 func TestModuleTypeBp2Build(t *testing.T) {
 	testCases := []bp2buildTestCase{
 		{
-			description:                        "filegroup with does not specify srcs",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "filegroup with does not specify srcs",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
     name: "fg_foo",
     bazel_module: { bp2build_available: true },
@@ -671,10 +670,9 @@
 			},
 		},
 		{
-			description:                        "filegroup with no srcs",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "filegroup with no srcs",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
     name: "fg_foo",
     srcs: [],
@@ -685,10 +683,9 @@
 			},
 		},
 		{
-			description:                        "filegroup with srcs",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "filegroup with srcs",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
     name: "fg_foo",
     srcs: ["a", "b"],
@@ -704,10 +701,9 @@
 			},
 		},
 		{
-			description:                        "filegroup with excludes srcs",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "filegroup with excludes srcs",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
     name: "fg_foo",
     srcs: ["a", "b"],
@@ -721,10 +717,9 @@
 			},
 		},
 		{
-			description:                        "filegroup with glob",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "filegroup with glob",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
     name: "fg_foo",
     srcs: ["**/*.txt"],
@@ -747,12 +742,10 @@
 			},
 		},
 		{
-			description:                        "filegroup with glob in subdir",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
-			blueprint:                          ``,
-			dir:                                "other",
+			description:                "filegroup with glob in subdir",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
+			dir:                        "other",
 			filesystem: map[string]string{
 				"other/Android.bp": `filegroup {
     name: "fg_foo",
@@ -775,10 +768,9 @@
 			},
 		},
 		{
-			description:                        "depends_on_other_dir_module",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "depends_on_other_dir_module",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
     name: "fg_foo",
     srcs: [
@@ -804,26 +796,25 @@
 			},
 		},
 		{
-			description:                        "depends_on_other_unconverted_module_error",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
-			unconvertedDepsMode:                errorModulesUnconvertedDeps,
-			filesystem: map[string]string{
-				"other/Android.bp": `filegroup {
-    name: "foo",
-    srcs: ["a", "b"],
-}`,
-			},
+			description:                "depends_on_other_unconverted_module_error",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
+			unconvertedDepsMode:        errorModulesUnconvertedDeps,
 			blueprint: `filegroup {
-    name: "fg_foo",
+    name: "foobar",
     srcs: [
         ":foo",
         "c",
     ],
     bazel_module: { bp2build_available: true },
 }`,
-			expectedErr: fmt.Errorf(`"fg_foo" depends on unconverted modules: foo`),
+			expectedErr: fmt.Errorf(`"foobar" depends on unconverted modules: foo`),
+			filesystem: map[string]string{
+				"other/Android.bp": `filegroup {
+    name: "foo",
+    srcs: ["a", "b"],
+}`,
+			},
 		},
 	}
 
@@ -838,18 +829,16 @@
 
 func TestAllowlistingBp2buildTargetsExplicitly(t *testing.T) {
 	testCases := []struct {
-		moduleTypeUnderTest                string
-		moduleTypeUnderTestFactory         android.ModuleFactory
-		moduleTypeUnderTestBp2BuildMutator bp2buildMutator
-		bp                                 string
-		expectedCount                      int
-		description                        string
+		moduleTypeUnderTest        string
+		moduleTypeUnderTestFactory android.ModuleFactory
+		bp                         string
+		expectedCount              int
+		description                string
 	}{
 		{
-			description:                        "explicitly unavailable",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "explicitly unavailable",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			bp: `filegroup {
     name: "foo",
     srcs: ["a", "b"],
@@ -858,10 +847,9 @@
 			expectedCount: 0,
 		},
 		{
-			description:                        "implicitly unavailable",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "implicitly unavailable",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			bp: `filegroup {
     name: "foo",
     srcs: ["a", "b"],
@@ -869,10 +857,9 @@
 			expectedCount: 0,
 		},
 		{
-			description:                        "explicitly available",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "explicitly available",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			bp: `filegroup {
     name: "foo",
     srcs: ["a", "b"],
@@ -881,12 +868,12 @@
 			expectedCount: 1,
 		},
 		{
-			description:                        "generates more than 1 target if needed",
-			moduleTypeUnderTest:                "custom",
-			moduleTypeUnderTestFactory:         customModuleFactory,
-			moduleTypeUnderTestBp2BuildMutator: customBp2BuildMutatorFromStarlark,
+			description:                "generates more than 1 target if needed",
+			moduleTypeUnderTest:        "custom",
+			moduleTypeUnderTestFactory: customModuleFactory,
 			bp: `custom {
     name: "foo",
+    one_to_many_prop: true,
     bazel_module: { bp2build_available: true },
 }`,
 			expectedCount: 3,
@@ -899,7 +886,6 @@
 			config := android.TestConfig(buildDir, nil, testCase.bp, nil)
 			ctx := android.NewTestContext(config)
 			ctx.RegisterModuleType(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestFactory)
-			ctx.RegisterBp2BuildMutator(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestBp2BuildMutator)
 			ctx.RegisterForBazelConversion()
 
 			_, errs := ctx.ParseFileList(dir, []string{"Android.bp"})
@@ -919,20 +905,18 @@
 
 func TestAllowlistingBp2buildTargetsWithConfig(t *testing.T) {
 	testCases := []struct {
-		moduleTypeUnderTest                string
-		moduleTypeUnderTestFactory         android.ModuleFactory
-		moduleTypeUnderTestBp2BuildMutator bp2buildMutator
-		expectedCount                      map[string]int
-		description                        string
-		bp2buildConfig                     android.Bp2BuildConfig
-		checkDir                           string
-		fs                                 map[string]string
+		moduleTypeUnderTest        string
+		moduleTypeUnderTestFactory android.ModuleFactory
+		expectedCount              map[string]int
+		description                string
+		bp2buildConfig             android.Bp2BuildConfig
+		checkDir                   string
+		fs                         map[string]string
 	}{
 		{
-			description:                        "test bp2build config package and subpackages config",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "test bp2build config package and subpackages config",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			expectedCount: map[string]int{
 				"migrated":                           1,
 				"migrated/but_not_really":            0,
@@ -954,10 +938,9 @@
 			},
 		},
 		{
-			description:                        "test bp2build config opt-in and opt-out",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "test bp2build config opt-in and opt-out",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			expectedCount: map[string]int{
 				"package-opt-in":             2,
 				"package-opt-in/subpackage":  0,
@@ -1008,7 +991,6 @@
 		config := android.TestConfig(buildDir, nil, "", fs)
 		ctx := android.NewTestContext(config)
 		ctx.RegisterModuleType(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestFactory)
-		ctx.RegisterBp2BuildMutator(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestBp2BuildMutator)
 		ctx.RegisterBp2BuildConfig(testCase.bp2buildConfig)
 		ctx.RegisterForBazelConversion()
 
@@ -1039,10 +1021,9 @@
 func TestCombineBuildFilesBp2buildTargets(t *testing.T) {
 	testCases := []bp2buildTestCase{
 		{
-			description:                        "filegroup bazel_module.label",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "filegroup bazel_module.label",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
     name: "fg_foo",
     bazel_module: { label: "//other:fg_foo" },
@@ -1055,19 +1036,18 @@
 			},
 		},
 		{
-			description:                        "multiple bazel_module.label same BUILD",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "multiple bazel_module.label same BUILD",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
-		    name: "fg_foo",
-		    bazel_module: { label: "//other:fg_foo" },
-		}
+        name: "fg_foo",
+        bazel_module: { label: "//other:fg_foo" },
+    }
 
-		filegroup {
-		    name: "foo",
-		    bazel_module: { label: "//other:foo" },
-		}`,
+    filegroup {
+        name: "foo",
+        bazel_module: { label: "//other:foo" },
+    }`,
 			expectedBazelTargets: []string{
 				`// BUILD file`,
 			},
@@ -1076,25 +1056,24 @@
 			},
 		},
 		{
-			description:                        "filegroup bazel_module.label and bp2build in subdir",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
-			dir:                                "other",
-			blueprint:                          ``,
+			description:                "filegroup bazel_module.label and bp2build in subdir",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
+			dir:                        "other",
+			blueprint:                  ``,
 			filesystem: map[string]string{
 				"other/Android.bp": `filegroup {
-				name: "fg_foo",
-				bazel_module: {
-					bp2build_available: true,
-				},
-			}
-			filegroup {
-				name: "fg_bar",
-				bazel_module: {
-					label: "//other:fg_bar"
-				},
-			}`,
+        name: "fg_foo",
+        bazel_module: {
+          bp2build_available: true,
+        },
+      }
+      filegroup {
+        name: "fg_bar",
+        bazel_module: {
+          label: "//other:fg_bar"
+        },
+      }`,
 				"other/BUILD.bazel": `// definition for fg_bar`,
 			},
 			expectedBazelTargets: []string{
@@ -1103,26 +1082,26 @@
 			},
 		},
 		{
-			description:                        "filegroup bazel_module.label and filegroup bp2build",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "filegroup bazel_module.label and filegroup bp2build",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
+
 			filesystem: map[string]string{
 				"other/BUILD.bazel": `// BUILD file`,
 			},
 			blueprint: `filegroup {
-		    name: "fg_foo",
-		    bazel_module: {
-		      label: "//other:fg_foo",
-		    },
-		}
+        name: "fg_foo",
+        bazel_module: {
+          label: "//other:fg_foo",
+        },
+    }
 
-		filegroup {
-		    name: "fg_bar",
-		    bazel_module: {
-		      bp2build_available: true,
-		    },
-		}`,
+    filegroup {
+        name: "fg_bar",
+        bazel_module: {
+          bp2build_available: true,
+        },
+    }`,
 			expectedBazelTargets: []string{
 				makeBazelTarget("filegroup", "fg_bar", map[string]string{}),
 				`// BUILD file`,
@@ -1146,7 +1125,6 @@
 			config := android.TestConfig(buildDir, nil, testCase.blueprint, fs)
 			ctx := android.NewTestContext(config)
 			ctx.RegisterModuleType(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestFactory)
-			ctx.RegisterBp2BuildMutator(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestBp2BuildMutator)
 			ctx.RegisterForBazelConversion()
 
 			_, errs := ctx.ParseFileList(dir, toParse)
@@ -1192,10 +1170,9 @@
 func TestGlobExcludeSrcs(t *testing.T) {
 	testCases := []bp2buildTestCase{
 		{
-			description:                        "filegroup top level exclude_srcs",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "filegroup top level exclude_srcs",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: `filegroup {
     name: "fg_foo",
     srcs: ["**/*.txt"],
@@ -1222,12 +1199,11 @@
 			},
 		},
 		{
-			description:                        "filegroup in subdir exclude_srcs",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
-			blueprint:                          "",
-			dir:                                "dir",
+			description:                "filegroup in subdir exclude_srcs",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
+			blueprint:                  "",
+			dir:                        "dir",
 			filesystem: map[string]string{
 				"dir/Android.bp": `filegroup {
     name: "fg_foo",
@@ -1264,10 +1240,9 @@
 func TestCommonBp2BuildModuleAttrs(t *testing.T) {
 	testCases := []bp2buildTestCase{
 		{
-			description:                        "Required into data test",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "Required into data test",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: simpleModuleDoNotConvertBp2build("filegroup", "reqd") + `
 filegroup {
     name: "fg_foo",
@@ -1281,21 +1256,20 @@
 			},
 		},
 		{
-			description:                        "Required via arch into data test",
-			moduleTypeUnderTest:                "python_library",
-			moduleTypeUnderTestFactory:         python.PythonLibraryFactory,
-			moduleTypeUnderTestBp2BuildMutator: python.PythonLibraryBp2Build,
+			description:                "Required via arch into data test",
+			moduleTypeUnderTest:        "python_library",
+			moduleTypeUnderTestFactory: python.PythonLibraryFactory,
 			blueprint: simpleModuleDoNotConvertBp2build("python_library", "reqdx86") +
 				simpleModuleDoNotConvertBp2build("python_library", "reqdarm") + `
 python_library {
     name: "fg_foo",
     arch: {
-			 arm: {
-				 required: ["reqdarm"],
-			 },
-			 x86: {
-				 required: ["reqdx86"],
-			 },
+       arm: {
+         required: ["reqdarm"],
+       },
+       x86: {
+         required: ["reqdx86"],
+       },
     },
     bazel_module: { bp2build_available: true },
 }`,
@@ -1311,10 +1285,9 @@
 			},
 		},
 		{
-			description:                        "Required appended to data test",
-			moduleTypeUnderTest:                "python_library",
-			moduleTypeUnderTestFactory:         python.PythonLibraryFactory,
-			moduleTypeUnderTestBp2BuildMutator: python.PythonLibraryBp2Build,
+			description:                "Required appended to data test",
+			moduleTypeUnderTest:        "python_library",
+			moduleTypeUnderTestFactory: python.PythonLibraryFactory,
 			filesystem: map[string]string{
 				"data.bin": "",
 				"src.py":   "",
@@ -1337,10 +1310,9 @@
 			},
 		},
 		{
-			description:                        "All props-to-attrs at once together test",
-			moduleTypeUnderTest:                "filegroup",
-			moduleTypeUnderTestFactory:         android.FileGroupFactory,
-			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			description:                "All props-to-attrs at once together test",
+			moduleTypeUnderTest:        "filegroup",
+			moduleTypeUnderTestFactory: android.FileGroupFactory,
 			blueprint: simpleModuleDoNotConvertBp2build("filegroup", "reqd") + `
 filegroup {
     name: "fg_foo",
diff --git a/bp2build/bzl_conversion_test.go b/bp2build/bzl_conversion_test.go
index 1e78c0e..f3345a6 100644
--- a/bp2build/bzl_conversion_test.go
+++ b/bp2build/bzl_conversion_test.go
@@ -100,6 +100,7 @@
         # nested_props_ptr start
 #         "nested_prop": attr.string(),
         # nested_props_ptr end
+        "one_to_many_prop": attr.bool(),
         "other_embedded_prop": attr.string(),
         "string_list_prop": attr.string_list(),
         "string_prop": attr.string(),
@@ -128,6 +129,7 @@
         # nested_props_ptr start
 #         "nested_prop": attr.string(),
         # nested_props_ptr end
+        "one_to_many_prop": attr.bool(),
         "other_embedded_prop": attr.string(),
         "string_list_prop": attr.string_list(),
         "string_prop": attr.string(),
@@ -156,6 +158,7 @@
         # nested_props_ptr start
 #         "nested_prop": attr.string(),
         # nested_props_ptr end
+        "one_to_many_prop": attr.bool(),
         "other_embedded_prop": attr.string(),
         "string_list_prop": attr.string_list(),
         "string_prop": attr.string(),
diff --git a/bp2build/cc_binary_conversion_test.go b/bp2build/cc_binary_conversion_test.go
index b46248f..a156480 100644
--- a/bp2build/cc_binary_conversion_test.go
+++ b/bp2build/cc_binary_conversion_test.go
@@ -68,14 +68,14 @@
 	t.Helper()
 	moduleTypeUnderTest := "cc_binary"
 	testCase := bp2buildTestCase{
-		expectedBazelTargets:               generateBazelTargetsForTest(tc.targets),
-		moduleTypeUnderTest:                moduleTypeUnderTest,
-		moduleTypeUnderTestFactory:         cc.BinaryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.BinaryBp2build,
-		description:                        fmt.Sprintf("%s %s", moduleTypeUnderTest, tc.description),
-		blueprint:                          binaryReplacer.Replace(tc.blueprint),
+		expectedBazelTargets:       generateBazelTargetsForTest(tc.targets),
+		moduleTypeUnderTest:        moduleTypeUnderTest,
+		moduleTypeUnderTestFactory: cc.BinaryFactory,
+		description:                fmt.Sprintf("%s %s", moduleTypeUnderTest, tc.description),
+		blueprint:                  binaryReplacer.Replace(tc.blueprint),
 	}
 	t.Run(testCase.description, func(t *testing.T) {
+		t.Helper()
 		runBp2BuildTestCase(t, registerCcBinaryModuleTypes, testCase)
 	})
 }
@@ -96,12 +96,11 @@
 	moduleTypeUnderTest := "cc_binary_host"
 	t.Run(testCase.description, func(t *testing.T) {
 		runBp2BuildTestCase(t, registerCcBinaryModuleTypes, bp2buildTestCase{
-			expectedBazelTargets:               generateBazelTargetsForTest(testCase.targets),
-			moduleTypeUnderTest:                moduleTypeUnderTest,
-			moduleTypeUnderTestFactory:         cc.BinaryHostFactory,
-			moduleTypeUnderTestBp2BuildMutator: cc.BinaryHostBp2build,
-			description:                        fmt.Sprintf("%s %s", moduleTypeUnderTest, tc.description),
-			blueprint:                          hostBinaryReplacer.Replace(testCase.blueprint),
+			expectedBazelTargets:       generateBazelTargetsForTest(testCase.targets),
+			moduleTypeUnderTest:        moduleTypeUnderTest,
+			moduleTypeUnderTestFactory: cc.BinaryHostFactory,
+			description:                fmt.Sprintf("%s %s", moduleTypeUnderTest, tc.description),
+			blueprint:                  hostBinaryReplacer.Replace(testCase.blueprint),
 		})
 	})
 }
@@ -258,11 +257,13 @@
 genrule {
     name: "generated_hdr",
     cmd: "nothing to see here",
+    bazel_module: { bp2build_available: false },
 }
 
 genrule {
     name: "export_generated_hdr",
     cmd: "nothing to see here",
+    bazel_module: { bp2build_available: false },
 }
 
 {rule_name} {
diff --git a/bp2build/cc_genrule_conversion_test.go b/bp2build/cc_genrule_conversion_test.go
index b3624dd..440b462 100644
--- a/bp2build/cc_genrule_conversion_test.go
+++ b/bp2build/cc_genrule_conversion_test.go
@@ -19,7 +19,6 @@
 
 	"android/soong/android"
 	"android/soong/cc"
-	"android/soong/genrule"
 )
 
 var otherCcGenruleBp = map[string]string{
@@ -41,7 +40,6 @@
 	t.Helper()
 	(&tc).moduleTypeUnderTest = "cc_genrule"
 	(&tc).moduleTypeUnderTestFactory = cc.GenRuleFactory
-	(&tc).moduleTypeUnderTestBp2BuildMutator = genrule.CcGenruleBp2Build
 	runBp2BuildTestCase(t, func(ctx android.RegistrationContext) {}, tc)
 }
 
diff --git a/bp2build/cc_library_conversion_test.go b/bp2build/cc_library_conversion_test.go
index dcbe326..b4eb28f 100644
--- a/bp2build/cc_library_conversion_test.go
+++ b/bp2build/cc_library_conversion_test.go
@@ -70,10 +70,9 @@
 
 func TestCcLibrarySimple(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library - simple example",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library - simple example",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"android.cpp": "",
 			"bionic.cpp":  "",
@@ -159,10 +158,9 @@
 
 func TestCcLibraryTrimmedLdAndroid(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library - trimmed example of //bionic/linker:ld-android",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library - trimmed example of //bionic/linker:ld-android",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"ld-android.cpp":           "",
 			"linked_list.h":            "",
@@ -170,8 +168,8 @@
 			"linker_block_allocator.h": "",
 			"linker_cfi.h":             "",
 		},
-		blueprint: soongCcLibraryPreamble + `
-cc_library_headers { name: "libc_headers" }
+		blueprint: soongCcLibraryPreamble +
+			simpleModuleDoNotConvertBp2build("cc_library_headers", "libc_headers") + `
 cc_library {
     name: "fake-ld-android",
     srcs: ["ld_android.cpp"],
@@ -228,11 +226,10 @@
 
 func TestCcLibraryExcludeSrcs(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library exclude_srcs - trimmed example of //external/arm-optimized-routines:libarm-optimized-routines-math",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
-		dir:                                "external",
+		description:                "cc_library exclude_srcs - trimmed example of //external/arm-optimized-routines:libarm-optimized-routines-math",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
+		dir:                        "external",
 		filesystem: map[string]string{
 			"external/math/cosf.c":      "",
 			"external/math/erf.c":       "",
@@ -280,10 +277,9 @@
 
 func TestCcLibrarySharedStaticProps(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library shared/static props",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library shared/static props",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"both.cpp":       "",
 			"sharedonly.cpp": "",
@@ -409,10 +405,9 @@
 
 func TestCcLibraryDeps(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library shared/static props",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library shared/static props",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"both.cpp":       "",
 			"sharedonly.cpp": "",
@@ -537,10 +532,9 @@
 
 func TestCcLibraryWholeStaticLibsAlwaysLink(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
-		dir:                                "foo/bar",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
+		dir:                        "foo/bar",
 		filesystem: map[string]string{
 			"foo/bar/Android.bp": `
 cc_library {
@@ -584,11 +578,10 @@
 
 func TestCcLibrarySharedStaticPropsInArch(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library shared/static props in arch",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
-		dir:                                "foo/bar",
+		description:                "cc_library shared/static props in arch",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
+		dir:                        "foo/bar",
 		filesystem: map[string]string{
 			"foo/bar/arm.cpp":        "",
 			"foo/bar/x86.cpp":        "",
@@ -735,11 +728,10 @@
 
 func TestCcLibrarySharedStaticPropsWithMixedSources(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library shared/static props with c/cpp/s mixed sources",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
-		dir:                                "foo/bar",
+		description:                "cc_library shared/static props with c/cpp/s mixed sources",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
+		dir:                        "foo/bar",
 		filesystem: map[string]string{
 			"foo/bar/both_source.cpp":   "",
 			"foo/bar/both_source.cc":    "",
@@ -868,11 +860,10 @@
 
 func TestCcLibraryNonConfiguredVersionScript(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library non-configured version script",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
-		dir:                                "foo/bar",
+		description:                "cc_library non-configured version script",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
+		dir:                        "foo/bar",
 		filesystem: map[string]string{
 			"foo/bar/Android.bp": `
 cc_library {
@@ -896,11 +887,10 @@
 
 func TestCcLibraryConfiguredVersionScript(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library configured version script",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
-		dir:                                "foo/bar",
+		description:                "cc_library configured version script",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
+		dir:                        "foo/bar",
 		filesystem: map[string]string{
 			"foo/bar/Android.bp": `
 cc_library {
@@ -940,10 +930,9 @@
 
 func TestCcLibrarySharedLibs(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library shared_libs",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library shared_libs",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "mylib",
@@ -994,10 +983,9 @@
 	})...)
 
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library pack_relocations test",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library pack_relocations test",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "a",
@@ -1036,10 +1024,9 @@
 
 func TestCcLibrarySpacesInCopts(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library spaces in copts",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library spaces in copts",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "a",
@@ -1059,10 +1046,9 @@
 
 func TestCcLibraryCppFlagsGoesIntoCopts(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library cppflags usage",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library cppflags usage",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `cc_library {
     name: "a",
     srcs: ["a.cpp"],
@@ -1104,10 +1090,9 @@
 
 func TestCcLibraryExcludeLibs(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
-		filesystem:                         map[string]string{},
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
+		filesystem:                 map[string]string{},
 		blueprint: soongCcLibraryStaticPreamble + `
 cc_library {
     name: "foo_static",
@@ -1212,10 +1197,9 @@
 
 func TestCCLibraryNoCrtTrue(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library - nocrt: true emits attribute",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library - nocrt: true emits attribute",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"impl.cpp": "",
 		},
@@ -1237,10 +1221,9 @@
 
 func TestCCLibraryNoCrtFalse(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library - nocrt: false - does not emit attribute",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library - nocrt: false - does not emit attribute",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"impl.cpp": "",
 		},
@@ -1260,10 +1243,9 @@
 
 func TestCCLibraryNoCrtArchVariant(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library - nocrt in select",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library - nocrt in select",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"impl.cpp": "",
 		},
@@ -1288,15 +1270,12 @@
 
 func TestCCLibraryNoLibCrtTrue(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library - simple example",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"impl.cpp": "",
 		},
 		blueprint: soongCcLibraryPreamble + `
-cc_library_headers { name: "some-headers" }
 cc_library {
     name: "foo-lib",
     srcs: ["impl.cpp"],
@@ -1337,14 +1316,12 @@
 
 func TestCCLibraryNoLibCrtFalse(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"impl.cpp": "",
 		},
 		blueprint: soongCcLibraryPreamble + `
-cc_library_headers { name: "some-headers" }
 cc_library {
     name: "foo-lib",
     srcs: ["impl.cpp"],
@@ -1361,9 +1338,8 @@
 
 func TestCCLibraryNoLibCrtArchVariant(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		filesystem: map[string]string{
 			"impl.cpp": "",
 		},
@@ -1423,10 +1399,9 @@
 	expectedTargets = append(expectedTargets, makeCcLibraryTargets("nothing", attrNameToString{})...)
 
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library strip args",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library strip args",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "nothing",
@@ -1474,10 +1449,9 @@
 
 func TestCcLibraryStripWithArch(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library strip args",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library strip args",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "multi-arch",
@@ -1528,10 +1502,9 @@
 
 func TestCcLibrary_SystemSharedLibsRootEmpty(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library system_shared_libs empty at root",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library system_shared_libs empty at root",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "root_empty",
@@ -1548,10 +1521,9 @@
 
 func TestCcLibrary_SystemSharedLibsStaticEmpty(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library system_shared_libs empty for static variant",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library system_shared_libs empty for static variant",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "static_empty",
@@ -1572,10 +1544,9 @@
 
 func TestCcLibrary_SystemSharedLibsSharedEmpty(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library system_shared_libs empty for shared variant",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library system_shared_libs empty for shared variant",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "shared_empty",
@@ -1596,10 +1567,9 @@
 
 func TestCcLibrary_SystemSharedLibsSharedBionicEmpty(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library system_shared_libs empty for shared, bionic variant",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library system_shared_libs empty for shared, bionic variant",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "shared_empty",
@@ -1628,10 +1598,9 @@
 	// only for linux_bionic, but `android` had `["libc", "libdl", "libm"].
 	// b/195791252 tracks the fix.
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library system_shared_libs empty for linux_bionic variant",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library system_shared_libs empty for linux_bionic variant",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "target_linux_bionic_empty",
@@ -1652,10 +1621,9 @@
 
 func TestCcLibrary_SystemSharedLibsBionicEmpty(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library system_shared_libs empty for bionic variant",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library system_shared_libs empty for bionic variant",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "target_bionic_empty",
@@ -1676,10 +1644,9 @@
 
 func TestCcLibrary_SystemSharedLibsSharedAndRoot(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library system_shared_libs set for shared and root",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		description:                "cc_library system_shared_libs set for shared and root",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcLibraryPreamble + `
 cc_library {
     name: "libc",
@@ -1715,13 +1682,11 @@
 
 func TestCcLibraryOsSelects(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		description:                        "cc_library - selects for all os targets",
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "cc_library - selects for all os targets",
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
+		filesystem:                 map[string]string{},
 		blueprint: soongCcLibraryPreamble + `
-cc_library_headers { name: "some-headers" }
 cc_library {
     name: "foo-lib",
     srcs: ["base.cpp"],
@@ -1861,10 +1826,9 @@
 
 		runCcLibraryTestCase(t, bp2buildTestCase{
 			description: fmt.Sprintf(
-				"cc_library with c_std: %s, cpp_std: %s and gnu_extensions: %s", tc.c_std, tc.cpp_std, tc.gnu_extensions),
-			moduleTypeUnderTest:                "cc_library",
-			moduleTypeUnderTestFactory:         cc.LibraryFactory,
-			moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+				"cc_library with cpp_std: %s and gnu_extensions: %s", tc.cpp_std, tc.gnu_extensions),
+			moduleTypeUnderTest:        "cc_library",
+			moduleTypeUnderTestFactory: cc.LibraryFactory,
 			blueprint: soongCcLibraryPreamble + fmt.Sprintf(`
 cc_library {
 	name: "%s_full",
@@ -1879,10 +1843,9 @@
 
 		runCcLibraryStaticTestCase(t, bp2buildTestCase{
 			description: fmt.Sprintf(
-				"cc_library_static with c_std: %s, cpp_std: %s and gnu_extensions: %s", tc.c_std, tc.cpp_std, tc.gnu_extensions),
-			moduleTypeUnderTest:                "cc_library_static",
-			moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-			moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
+				"cc_library_static with cpp_std: %s and gnu_extensions: %s", tc.cpp_std, tc.gnu_extensions),
+			moduleTypeUnderTest:        "cc_library_static",
+			moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
 			blueprint: soongCcLibraryPreamble + fmt.Sprintf(`
 cc_library_static {
 	name: "%s_static",
@@ -1899,10 +1862,9 @@
 
 		runCcLibrarySharedTestCase(t, bp2buildTestCase{
 			description: fmt.Sprintf(
-				"cc_library_shared with c_std: %s, cpp_std: %s and gnu_extensions: %s", tc.c_std, tc.cpp_std, tc.gnu_extensions),
-			moduleTypeUnderTest:                "cc_library_shared",
-			moduleTypeUnderTestFactory:         cc.LibrarySharedFactory,
-			moduleTypeUnderTestBp2BuildMutator: cc.CcLibrarySharedBp2Build,
+				"cc_library_shared with cpp_std: %s and gnu_extensions: %s", tc.cpp_std, tc.gnu_extensions),
+			moduleTypeUnderTest:        "cc_library_shared",
+			moduleTypeUnderTestFactory: cc.LibrarySharedFactory,
 			blueprint: soongCcLibraryPreamble + fmt.Sprintf(`
 cc_library_shared {
 	name: "%s_shared",
@@ -1921,9 +1883,8 @@
 
 func TestCcLibraryProtoSimple(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcProtoPreamble + `cc_library {
 	name: "foo",
 	srcs: ["foo.proto"],
@@ -1947,9 +1908,8 @@
 
 func TestCcLibraryProtoNoCanonicalPathFromRoot(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcProtoPreamble + `cc_library {
 	name: "foo",
 	srcs: ["foo.proto"],
@@ -1973,9 +1933,8 @@
 
 func TestCcLibraryProtoExplicitCanonicalPathFromRoot(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcProtoPreamble + `cc_library {
 	name: "foo",
 	srcs: ["foo.proto"],
@@ -2000,9 +1959,8 @@
 
 func TestCcLibraryProtoFull(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcProtoPreamble + `cc_library {
 	name: "foo",
 	srcs: ["foo.proto"],
@@ -2029,9 +1987,8 @@
 
 func TestCcLibraryProtoLite(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcProtoPreamble + `cc_library {
 	name: "foo",
 	srcs: ["foo.proto"],
@@ -2058,9 +2015,8 @@
 
 func TestCcLibraryProtoExportHeaders(t *testing.T) {
 	runCcLibraryTestCase(t, bp2buildTestCase{
-		moduleTypeUnderTest:                "cc_library",
-		moduleTypeUnderTestFactory:         cc.LibraryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		moduleTypeUnderTest:        "cc_library",
+		moduleTypeUnderTestFactory: cc.LibraryFactory,
 		blueprint: soongCcProtoPreamble + `cc_library {
 	name: "foo",
 	srcs: ["foo.proto"],
diff --git a/bp2build/cc_library_headers_conversion_test.go b/bp2build/cc_library_headers_conversion_test.go
index 76fdab2..594c050 100644
--- a/bp2build/cc_library_headers_conversion_test.go
+++ b/bp2build/cc_library_headers_conversion_test.go
@@ -78,10 +78,9 @@
 
 func TestCcLibraryHeadersSimple(t *testing.T) {
 	runCcLibraryHeadersTestCase(t, bp2buildTestCase{
-		description:                        "cc_library_headers test",
-		moduleTypeUnderTest:                "cc_library_headers",
-		moduleTypeUnderTestFactory:         cc.LibraryHeaderFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryHeadersBp2Build,
+		description:                "cc_library_headers test",
+		moduleTypeUnderTest:        "cc_library_headers",
+		moduleTypeUnderTestFactory: cc.LibraryHeaderFactory,
 		filesystem: map[string]string{
 			"lib-1/lib1a.h":                        "",
 			"lib-1/lib1b.h":                        "",
@@ -150,11 +149,10 @@
 
 func TestCcLibraryHeadersOsSpecificHeader(t *testing.T) {
 	runCcLibraryHeadersTestCase(t, bp2buildTestCase{
-		description:                        "cc_library_headers test with os-specific header_libs props",
-		moduleTypeUnderTest:                "cc_library_headers",
-		moduleTypeUnderTestFactory:         cc.LibraryHeaderFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryHeadersBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "cc_library_headers test with os-specific header_libs props",
+		moduleTypeUnderTest:        "cc_library_headers",
+		moduleTypeUnderTestFactory: cc.LibraryHeaderFactory,
+		filesystem:                 map[string]string{},
 		blueprint: soongCcLibraryPreamble + `
 cc_library_headers {
     name: "android-lib",
@@ -209,11 +207,10 @@
 
 func TestCcLibraryHeadersOsSpecficHeaderLibsExportHeaderLibHeaders(t *testing.T) {
 	runCcLibraryHeadersTestCase(t, bp2buildTestCase{
-		description:                        "cc_library_headers test with os-specific header_libs and export_header_lib_headers props",
-		moduleTypeUnderTest:                "cc_library_headers",
-		moduleTypeUnderTestFactory:         cc.LibraryHeaderFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryHeadersBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "cc_library_headers test with os-specific header_libs and export_header_lib_headers props",
+		moduleTypeUnderTest:        "cc_library_headers",
+		moduleTypeUnderTestFactory: cc.LibraryHeaderFactory,
+		filesystem:                 map[string]string{},
 		blueprint: soongCcLibraryPreamble + `
 cc_library_headers {
     name: "android-lib",
@@ -250,11 +247,10 @@
 
 func TestCcLibraryHeadersArchAndTargetExportSystemIncludes(t *testing.T) {
 	runCcLibraryHeadersTestCase(t, bp2buildTestCase{
-		description:                        "cc_library_headers test with arch-specific and target-specific export_system_include_dirs props",
-		moduleTypeUnderTest:                "cc_library_headers",
-		moduleTypeUnderTestFactory:         cc.LibraryHeaderFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryHeadersBp2Build,
-		filesystem:                         map[string]string{},
+		description:                "cc_library_headers test with arch-specific and target-specific export_system_include_dirs props",
+		moduleTypeUnderTest:        "cc_library_headers",
+		moduleTypeUnderTestFactory: cc.LibraryHeaderFactory,
+		filesystem:                 map[string]string{},
 		blueprint: soongCcLibraryPreamble + `cc_library_headers {
     name: "foo_headers",
     export_system_include_dirs: [
@@ -310,10 +306,9 @@
 
 func TestCcLibraryHeadersNoCrtIgnored(t *testing.T) {
 	runCcLibraryHeadersTestCase(t, bp2buildTestCase{
-		description:                        "cc_library_headers test",
-		moduleTypeUnderTest:                "cc_library_headers",
-		moduleTypeUnderTestFactory:         cc.LibraryHeaderFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryHeadersBp2Build,
+		description:                "cc_library_headers test",
+		moduleTypeUnderTest:        "cc_library_headers",
+		moduleTypeUnderTestFactory: cc.LibraryHeaderFactory,
 		filesystem: map[string]string{
 			"lib-1/lib1a.h":                        "",
 			"lib-1/lib1b.h":                        "",
diff --git a/bp2build/cc_library_shared_conversion_test.go b/bp2build/cc_library_shared_conversion_test.go
index 64f368e..97a600a 100644
--- a/bp2build/cc_library_shared_conversion_test.go
+++ b/bp2build/cc_library_shared_conversion_test.go
@@ -40,7 +40,6 @@
 	t.Helper()
 	(&tc).moduleTypeUnderTest = "cc_library_shared"
 	(&tc).moduleTypeUnderTestFactory = cc.LibrarySharedFactory
-	(&tc).moduleTypeUnderTestBp2BuildMutator = cc.CcLibrarySharedBp2Build
 	runBp2BuildTestCase(t, registerCcLibrarySharedModuleTypes, tc)
 }
 
diff --git a/bp2build/cc_library_static_conversion_test.go b/bp2build/cc_library_static_conversion_test.go
index fff0b4e..e2e55dd 100644
--- a/bp2build/cc_library_static_conversion_test.go
+++ b/bp2build/cc_library_static_conversion_test.go
@@ -82,7 +82,6 @@
 
 	(&tc).moduleTypeUnderTest = "cc_library_static"
 	(&tc).moduleTypeUnderTestFactory = cc.LibraryStaticFactory
-	(&tc).moduleTypeUnderTestBp2BuildMutator = cc.CcLibraryStaticBp2Build
 	runBp2BuildTestCase(t, registerCcLibraryStaticModuleTypes, tc)
 }
 
@@ -954,11 +953,13 @@
 genrule {
     name: "generated_hdr",
     cmd: "nothing to see here",
+    bazel_module: { bp2build_available: false },
 }
 
 genrule {
     name: "export_generated_hdr",
     cmd: "nothing to see here",
+    bazel_module: { bp2build_available: false },
 }
 
 cc_library_static {
@@ -998,48 +999,17 @@
 			"for-x86.cpp":            "",
 			"not-for-x86.cpp":        "",
 			"not-for-everything.cpp": "",
-			"dep/Android.bp": `
-genrule {
-  name: "generated_src_other_pkg",
-  cmd: "nothing to see here",
-}
-
-genrule {
-  name: "generated_hdr_other_pkg",
-  cmd: "nothing to see here",
-}
-
-genrule {
-  name: "generated_hdr_other_pkg_x86",
-  cmd: "nothing to see here",
-}
-
-genrule {
-  name: "generated_hdr_other_pkg_android",
-  cmd: "nothing to see here",
-}`,
+			"dep/Android.bp": simpleModuleDoNotConvertBp2build("genrule", "generated_src_other_pkg") +
+				simpleModuleDoNotConvertBp2build("genrule", "generated_hdr_other_pkg") +
+				simpleModuleDoNotConvertBp2build("genrule", "generated_src_other_pkg_x86") +
+				simpleModuleDoNotConvertBp2build("genrule", "generated_hdr_other_pkg_x86") +
+				simpleModuleDoNotConvertBp2build("genrule", "generated_hdr_other_pkg_android"),
 		},
-		blueprint: soongCcLibraryStaticPreamble + `
-genrule {
-    name: "generated_src",
-    cmd: "nothing to see here",
-}
-
-genrule {
-    name: "generated_src_not_x86",
-    cmd: "nothing to see here",
-}
-
-genrule {
-    name: "generated_src_android",
-    cmd: "nothing to see here",
-}
-
-genrule {
-    name: "generated_hdr",
-    cmd: "nothing to see here",
-}
-
+		blueprint: soongCcLibraryStaticPreamble +
+			simpleModuleDoNotConvertBp2build("genrule", "generated_src") +
+			simpleModuleDoNotConvertBp2build("genrule", "generated_src_not_x86") +
+			simpleModuleDoNotConvertBp2build("genrule", "generated_src_android") +
+			simpleModuleDoNotConvertBp2build("genrule", "generated_hdr") + `
 cc_library_static {
     name: "foo_static",
     srcs: ["common.cpp", "not-for-*.cpp"],
@@ -1373,9 +1343,8 @@
 func TestStaticLibrary_SystemSharedLibsBionic(t *testing.T) {
 	runCcLibraryStaticTestCase(t, bp2buildTestCase{
 		description: "cc_library_static system_shared_libs set for bionic variant",
-		blueprint: soongCcLibraryStaticPreamble + `
-cc_library{name: "libc"}
-
+		blueprint: soongCcLibraryStaticPreamble +
+			simpleModuleDoNotConvertBp2build("cc_library", "libc") + `
 cc_library_static {
     name: "target_bionic",
     target: {
@@ -1401,10 +1370,9 @@
 func TestStaticLibrary_SystemSharedLibsLinuxRootAndLinuxBionic(t *testing.T) {
 	runCcLibraryStaticTestCase(t, bp2buildTestCase{
 		description: "cc_library_static system_shared_libs set for root and linux_bionic variant",
-		blueprint: soongCcLibraryStaticPreamble + `
-cc_library{name: "libc"}
-cc_library{name: "libm"}
-
+		blueprint: soongCcLibraryStaticPreamble +
+			simpleModuleDoNotConvertBp2build("cc_library", "libc") +
+			simpleModuleDoNotConvertBp2build("cc_library", "libm") + `
 cc_library_static {
     name: "target_linux_bionic",
     system_shared_libs: ["libc"],
diff --git a/bp2build/cc_object_conversion_test.go b/bp2build/cc_object_conversion_test.go
index 5ab9129..0a6c317 100644
--- a/bp2build/cc_object_conversion_test.go
+++ b/bp2build/cc_object_conversion_test.go
@@ -30,7 +30,6 @@
 	t.Helper()
 	(&tc).moduleTypeUnderTest = "cc_object"
 	(&tc).moduleTypeUnderTestFactory = cc.ObjectFactory
-	(&tc).moduleTypeUnderTestBp2BuildMutator = cc.ObjectBp2Build
 	runBp2BuildTestCase(t, registerCcObjectModuleTypes, tc)
 }
 
diff --git a/bp2build/cc_prebuilt_library_shared_test.go b/bp2build/cc_prebuilt_library_shared_test.go
index bac3908..ef2fddc 100644
--- a/bp2build/cc_prebuilt_library_shared_test.go
+++ b/bp2build/cc_prebuilt_library_shared_test.go
@@ -9,10 +9,9 @@
 func TestSharedPrebuiltLibrary(t *testing.T) {
 	runBp2BuildTestCaseSimple(t,
 		bp2buildTestCase{
-			description:                        "prebuilt library shared simple",
-			moduleTypeUnderTest:                "cc_prebuilt_library_shared",
-			moduleTypeUnderTestFactory:         cc.PrebuiltSharedLibraryFactory,
-			moduleTypeUnderTestBp2BuildMutator: cc.PrebuiltLibrarySharedBp2Build,
+			description:                "prebuilt library shared simple",
+			moduleTypeUnderTest:        "cc_prebuilt_library_shared",
+			moduleTypeUnderTestFactory: cc.PrebuiltSharedLibraryFactory,
 			filesystem: map[string]string{
 				"libf.so": "",
 			},
@@ -33,10 +32,9 @@
 func TestSharedPrebuiltLibraryWithArchVariance(t *testing.T) {
 	runBp2BuildTestCaseSimple(t,
 		bp2buildTestCase{
-			description:                        "prebuilt library shared with arch variance",
-			moduleTypeUnderTest:                "cc_prebuilt_library_shared",
-			moduleTypeUnderTestFactory:         cc.PrebuiltSharedLibraryFactory,
-			moduleTypeUnderTestBp2BuildMutator: cc.PrebuiltLibrarySharedBp2Build,
+			description:                "prebuilt library shared with arch variance",
+			moduleTypeUnderTest:        "cc_prebuilt_library_shared",
+			moduleTypeUnderTestFactory: cc.PrebuiltSharedLibraryFactory,
 			filesystem: map[string]string{
 				"libf.so": "",
 				"libg.so": "",
diff --git a/bp2build/filegroup_conversion_test.go b/bp2build/filegroup_conversion_test.go
index 9f4add2..b43cf53 100644
--- a/bp2build/filegroup_conversion_test.go
+++ b/bp2build/filegroup_conversion_test.go
@@ -25,7 +25,6 @@
 	t.Helper()
 	(&tc).moduleTypeUnderTest = "filegroup"
 	(&tc).moduleTypeUnderTestFactory = android.FileGroupFactory
-	(&tc).moduleTypeUnderTestBp2BuildMutator = android.FilegroupBp2Build
 	runBp2BuildTestCase(t, registerFilegroupModuleTypes, tc)
 }
 
diff --git a/bp2build/genrule_conversion_test.go b/bp2build/genrule_conversion_test.go
index 5976666..fd631a5 100644
--- a/bp2build/genrule_conversion_test.go
+++ b/bp2build/genrule_conversion_test.go
@@ -28,7 +28,6 @@
 	t.Helper()
 	(&tc).moduleTypeUnderTest = "genrule"
 	(&tc).moduleTypeUnderTestFactory = genrule.GenRuleFactory
-	(&tc).moduleTypeUnderTestBp2BuildMutator = genrule.GenruleBp2Build
 	runBp2BuildTestCase(t, registerGenruleModuleTypes, tc)
 }
 
diff --git a/bp2build/prebuilt_etc_conversion_test.go b/bp2build/prebuilt_etc_conversion_test.go
index 1189309..5065893 100644
--- a/bp2build/prebuilt_etc_conversion_test.go
+++ b/bp2build/prebuilt_etc_conversion_test.go
@@ -25,7 +25,6 @@
 	t.Helper()
 	(&tc).moduleTypeUnderTest = "prebuilt_etc"
 	(&tc).moduleTypeUnderTestFactory = etc.PrebuiltEtcFactory
-	(&tc).moduleTypeUnderTestBp2BuildMutator = etc.PrebuiltEtcBp2Build
 	runBp2BuildTestCase(t, registerPrebuiltEtcModuleTypes, tc)
 }
 
diff --git a/bp2build/python_binary_conversion_test.go b/bp2build/python_binary_conversion_test.go
index 01b6aa2..40c8ba1 100644
--- a/bp2build/python_binary_conversion_test.go
+++ b/bp2build/python_binary_conversion_test.go
@@ -17,10 +17,9 @@
 
 func TestPythonBinaryHostSimple(t *testing.T) {
 	runBp2BuildTestCaseWithPythonLibraries(t, bp2buildTestCase{
-		description:                        "simple python_binary_host converts to a native py_binary",
-		moduleTypeUnderTest:                "python_binary_host",
-		moduleTypeUnderTestFactory:         python.PythonBinaryHostFactory,
-		moduleTypeUnderTestBp2BuildMutator: python.PythonBinaryBp2Build,
+		description:                "simple python_binary_host converts to a native py_binary",
+		moduleTypeUnderTest:        "python_binary_host",
+		moduleTypeUnderTestFactory: python.PythonBinaryHostFactory,
 		filesystem: map[string]string{
 			"a.py":           "",
 			"b/c.py":         "",
@@ -40,7 +39,7 @@
     python_library_host {
       name: "bar",
       srcs: ["b/e.py"],
-      bazel_module: { bp2build_available: true },
+      bazel_module: { bp2build_available: false },
     }`,
 		expectedBazelTargets: []string{
 			makeBazelTarget("py_binary", "foo", attrNameToString{
@@ -59,10 +58,9 @@
 
 func TestPythonBinaryHostPy2(t *testing.T) {
 	runBp2BuildTestCaseSimple(t, bp2buildTestCase{
-		description:                        "py2 python_binary_host",
-		moduleTypeUnderTest:                "python_binary_host",
-		moduleTypeUnderTestFactory:         python.PythonBinaryHostFactory,
-		moduleTypeUnderTestBp2BuildMutator: python.PythonBinaryBp2Build,
+		description:                "py2 python_binary_host",
+		moduleTypeUnderTest:        "python_binary_host",
+		moduleTypeUnderTestFactory: python.PythonBinaryHostFactory,
 		blueprint: `python_binary_host {
     name: "foo",
     srcs: ["a.py"],
@@ -89,10 +87,9 @@
 
 func TestPythonBinaryHostPy3(t *testing.T) {
 	runBp2BuildTestCaseSimple(t, bp2buildTestCase{
-		description:                        "py3 python_binary_host",
-		moduleTypeUnderTest:                "python_binary_host",
-		moduleTypeUnderTestFactory:         python.PythonBinaryHostFactory,
-		moduleTypeUnderTestBp2BuildMutator: python.PythonBinaryBp2Build,
+		description:                "py3 python_binary_host",
+		moduleTypeUnderTest:        "python_binary_host",
+		moduleTypeUnderTestFactory: python.PythonBinaryHostFactory,
 		blueprint: `python_binary_host {
     name: "foo",
     srcs: ["a.py"],
@@ -119,10 +116,9 @@
 
 func TestPythonBinaryHostArchVariance(t *testing.T) {
 	runBp2BuildTestCaseSimple(t, bp2buildTestCase{
-		description:                        "test arch variants",
-		moduleTypeUnderTest:                "python_binary_host",
-		moduleTypeUnderTestFactory:         python.PythonBinaryHostFactory,
-		moduleTypeUnderTestBp2BuildMutator: python.PythonBinaryBp2Build,
+		description:                "test arch variants",
+		moduleTypeUnderTest:        "python_binary_host",
+		moduleTypeUnderTestFactory: python.PythonBinaryHostFactory,
 		filesystem: map[string]string{
 			"dir/arm.py": "",
 			"dir/x86.py": "",
diff --git a/bp2build/python_library_conversion_test.go b/bp2build/python_library_conversion_test.go
index e334592..6b26105 100644
--- a/bp2build/python_library_conversion_test.go
+++ b/bp2build/python_library_conversion_test.go
@@ -18,7 +18,6 @@
 	testCase.blueprint = fmt.Sprintf(testCase.blueprint, "python_library")
 	testCase.moduleTypeUnderTest = "python_library"
 	testCase.moduleTypeUnderTestFactory = python.PythonLibraryFactory
-	testCase.moduleTypeUnderTestBp2BuildMutator = python.PythonLibraryBp2Build
 	runBp2BuildTestCaseSimple(t, testCase)
 }
 
@@ -29,7 +28,6 @@
 	testCase.blueprint = fmt.Sprintf(testCase.blueprint, "python_library_host")
 	testCase.moduleTypeUnderTest = "python_library_host"
 	testCase.moduleTypeUnderTestFactory = python.PythonLibraryHostFactory
-	testCase.moduleTypeUnderTestBp2BuildMutator = python.PythonLibraryHostBp2Build
 	runBp2BuildTestCase(t, func(ctx android.RegistrationContext) {
 		ctx.RegisterModuleType("python_library", python.PythonLibraryFactory)
 	},
diff --git a/bp2build/sh_conversion_test.go b/bp2build/sh_conversion_test.go
index 0d87c8d..f6d2a20 100644
--- a/bp2build/sh_conversion_test.go
+++ b/bp2build/sh_conversion_test.go
@@ -55,10 +55,9 @@
 
 func TestShBinarySimple(t *testing.T) {
 	runShBinaryTestCase(t, bp2buildTestCase{
-		description:                        "sh_binary test",
-		moduleTypeUnderTest:                "sh_binary",
-		moduleTypeUnderTestFactory:         sh.ShBinaryFactory,
-		moduleTypeUnderTestBp2BuildMutator: sh.ShBinaryBp2Build,
+		description:                "sh_binary test",
+		moduleTypeUnderTest:        "sh_binary",
+		moduleTypeUnderTestFactory: sh.ShBinaryFactory,
 		blueprint: `sh_binary {
     name: "foo",
     src: "foo.sh",
diff --git a/bp2build/soong_config_module_type_conversion_test.go b/bp2build/soong_config_module_type_conversion_test.go
index d21db04..f1489aa 100644
--- a/bp2build/soong_config_module_type_conversion_test.go
+++ b/bp2build/soong_config_module_type_conversion_test.go
@@ -61,11 +61,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - soong_config_module_type is supported in bp2build",
-		moduleTypeUnderTest:                "cc_library_static",
-		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
-		blueprint:                          bp,
+		description:                "soong config variables - soong_config_module_type is supported in bp2build",
+		moduleTypeUnderTest:        "cc_library_static",
+		moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
+		blueprint:                  bp,
 		expectedBazelTargets: []string{`cc_library_static(
     name = "foo",
     copts = select({
@@ -107,10 +106,9 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - soong_config_module_type_import is supported in bp2build",
-		moduleTypeUnderTest:                "cc_library_static",
-		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
+		description:                "soong config variables - soong_config_module_type_import is supported in bp2build",
+		moduleTypeUnderTest:        "cc_library_static",
+		moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
 		filesystem: map[string]string{
 			"foo/bar/SoongConfig.bp": configBp,
 		},
@@ -161,11 +159,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - generates selects for string vars",
-		moduleTypeUnderTest:                "cc_library_static",
-		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
-		blueprint:                          bp,
+		description:                "soong config variables - generates selects for string vars",
+		moduleTypeUnderTest:        "cc_library_static",
+		moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
+		blueprint:                  bp,
 		expectedBazelTargets: []string{`cc_library_static(
     name = "foo",
     copts = select({
@@ -232,11 +229,10 @@
 }`
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - generates selects for multiple variable types",
-		moduleTypeUnderTest:                "cc_library_static",
-		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
-		blueprint:                          bp,
+		description:                "soong config variables - generates selects for multiple variable types",
+		moduleTypeUnderTest:        "cc_library_static",
+		moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
+		blueprint:                  bp,
 		expectedBazelTargets: []string{`cc_library_static(
     name = "foo",
     copts = select({
@@ -298,11 +294,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - generates selects for label list attributes",
-		moduleTypeUnderTest:                "cc_library_static",
-		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
-		blueprint:                          bp,
+		description:                "soong config variables - generates selects for label list attributes",
+		moduleTypeUnderTest:        "cc_library_static",
+		moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
+		blueprint:                  bp,
 		filesystem: map[string]string{
 			"foo/bar/Android.bp": otherDeps,
 		},
@@ -365,11 +360,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - defaults with a single namespace",
-		moduleTypeUnderTest:                "cc_library_static",
-		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
-		blueprint:                          bp,
+		description:                "soong config variables - defaults with a single namespace",
+		moduleTypeUnderTest:        "cc_library_static",
+		moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
+		blueprint:                  bp,
 		expectedBazelTargets: []string{`cc_library_static(
     name = "lib",
     copts = select({
@@ -445,11 +439,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - multiple defaults with a single namespace",
-		moduleTypeUnderTest:                "cc_library_static",
-		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
-		blueprint:                          bp,
+		description:                "soong config variables - multiple defaults with a single namespace",
+		moduleTypeUnderTest:        "cc_library_static",
+		moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
+		blueprint:                  bp,
 		expectedBazelTargets: []string{`cc_library_static(
     name = "lib",
     asflags = select({
@@ -561,11 +554,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - defaults with multiple namespaces",
-		moduleTypeUnderTest:                "cc_library_static",
-		moduleTypeUnderTestFactory:         cc.LibraryStaticFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryStaticBp2Build,
-		blueprint:                          bp,
+		description:                "soong config variables - defaults with multiple namespaces",
+		moduleTypeUnderTest:        "cc_library_static",
+		moduleTypeUnderTestFactory: cc.LibraryStaticFactory,
+		blueprint:                  bp,
 		expectedBazelTargets: []string{`cc_library_static(
     name = "lib",
     copts = select({
@@ -652,11 +644,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - generates selects for library_linking_strategy",
-		moduleTypeUnderTest:                "cc_binary",
-		moduleTypeUnderTestFactory:         cc.BinaryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.BinaryBp2build,
-		blueprint:                          bp,
+		description:                "soong config variables - generates selects for library_linking_strategy",
+		moduleTypeUnderTest:        "cc_binary",
+		moduleTypeUnderTestFactory: cc.BinaryFactory,
+		blueprint:                  bp,
 		filesystem: map[string]string{
 			"foo/bar/Android.bp": otherDeps,
 		},
@@ -733,11 +724,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - generates selects for library_linking_strategy",
-		moduleTypeUnderTest:                "cc_binary",
-		moduleTypeUnderTestFactory:         cc.BinaryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.BinaryBp2build,
-		blueprint:                          bp,
+		description:                "soong config variables - generates selects for library_linking_strategy",
+		moduleTypeUnderTest:        "cc_binary",
+		moduleTypeUnderTestFactory: cc.BinaryFactory,
+		blueprint:                  bp,
 		filesystem: map[string]string{
 			"foo/bar/Android.bp": otherDeps,
 		},
@@ -821,11 +811,10 @@
 `
 
 	runSoongConfigModuleTypeTest(t, bp2buildTestCase{
-		description:                        "soong config variables - generates selects for library_linking_strategy",
-		moduleTypeUnderTest:                "cc_binary",
-		moduleTypeUnderTestFactory:         cc.BinaryFactory,
-		moduleTypeUnderTestBp2BuildMutator: cc.BinaryBp2build,
-		blueprint:                          bp,
+		description:                "soong config variables - generates selects for library_linking_strategy",
+		moduleTypeUnderTest:        "cc_binary",
+		moduleTypeUnderTestFactory: cc.BinaryFactory,
+		blueprint:                  bp,
 		filesystem: map[string]string{
 			"foo/bar/Android.bp": otherDeps,
 		},
diff --git a/bp2build/testing.go b/bp2build/testing.go
index cd84519..15cf486 100644
--- a/bp2build/testing.go
+++ b/bp2build/testing.go
@@ -74,16 +74,15 @@
 }
 
 type bp2buildTestCase struct {
-	description                        string
-	moduleTypeUnderTest                string
-	moduleTypeUnderTestFactory         android.ModuleFactory
-	moduleTypeUnderTestBp2BuildMutator func(android.TopDownMutatorContext)
-	blueprint                          string
-	expectedBazelTargets               []string
-	filesystem                         map[string]string
-	dir                                string
-	expectedErr                        error
-	unconvertedDepsMode                unconvertedDepsMode
+	description                string
+	moduleTypeUnderTest        string
+	moduleTypeUnderTestFactory android.ModuleFactory
+	blueprint                  string
+	expectedBazelTargets       []string
+	filesystem                 map[string]string
+	dir                        string
+	expectedErr                error
+	unconvertedDepsMode        unconvertedDepsMode
 }
 
 func runBp2BuildTestCase(t *testing.T, registerModuleTypes func(ctx android.RegistrationContext), tc bp2buildTestCase) {
@@ -105,7 +104,6 @@
 	registerModuleTypes(ctx)
 	ctx.RegisterModuleType(tc.moduleTypeUnderTest, tc.moduleTypeUnderTestFactory)
 	ctx.RegisterBp2BuildConfig(bp2buildConfig)
-	ctx.RegisterBp2BuildMutator(tc.moduleTypeUnderTest, tc.moduleTypeUnderTestBp2BuildMutator)
 	ctx.RegisterForBazelConversion()
 
 	_, parseErrs := ctx.ParseFileList(dir, toParse)
@@ -178,6 +176,9 @@
 
 	Arch_paths         []string `android:"path,arch_variant"`
 	Arch_paths_exclude []string `android:"path,arch_variant"`
+
+	// Prop used to indicate this conversion should be 1 module -> multiple targets
+	One_to_many_prop *bool
 }
 
 type customModule struct {
@@ -277,71 +278,65 @@
 	Arch_paths       bazel.LabelListAttribute
 }
 
-func customBp2BuildMutator(ctx android.TopDownMutatorContext) {
-	if m, ok := ctx.Module().(*customModule); ok {
-		if !m.ConvertWithBp2build(ctx) {
-			return
-		}
+func (m *customModule) ConvertWithBp2build(ctx android.TopDownMutatorContext) {
+	paths := bazel.LabelListAttribute{}
 
-		paths := bazel.LabelListAttribute{}
+	if p := m.props.One_to_many_prop; p != nil && *p {
+		customBp2buildOneToMany(ctx, m)
+		return
+	}
 
-		for axis, configToProps := range m.GetArchVariantProperties(ctx, &customProps{}) {
-			for config, props := range configToProps {
-				if archProps, ok := props.(*customProps); ok && archProps.Arch_paths != nil {
-					paths.SetSelectValue(axis, config, android.BazelLabelForModuleSrcExcludes(ctx, archProps.Arch_paths, archProps.Arch_paths_exclude))
-				}
+	for axis, configToProps := range m.GetArchVariantProperties(ctx, &customProps{}) {
+		for config, props := range configToProps {
+			if archProps, ok := props.(*customProps); ok && archProps.Arch_paths != nil {
+				paths.SetSelectValue(axis, config, android.BazelLabelForModuleSrcExcludes(ctx, archProps.Arch_paths, archProps.Arch_paths_exclude))
 			}
 		}
-
-		paths.ResolveExcludes()
-
-		attrs := &customBazelModuleAttributes{
-			String_ptr_prop:  m.props.String_ptr_prop,
-			String_list_prop: m.props.String_list_prop,
-			Arch_paths:       paths,
-		}
-		attrs.Embedded_attr = m.props.Embedded_prop
-		if m.props.OtherEmbeddedProps != nil {
-			attrs.OtherEmbeddedAttr = &OtherEmbeddedAttr{Other_embedded_attr: m.props.OtherEmbeddedProps.Other_embedded_prop}
-		}
-
-		props := bazel.BazelTargetModuleProperties{
-			Rule_class: "custom",
-		}
-
-		ctx.CreateBazelTargetModule(props, android.CommonAttributes{Name: m.Name()}, attrs)
 	}
+
+	paths.ResolveExcludes()
+
+	attrs := &customBazelModuleAttributes{
+		String_ptr_prop:  m.props.String_ptr_prop,
+		String_list_prop: m.props.String_list_prop,
+		Arch_paths:       paths,
+	}
+	attrs.Embedded_attr = m.props.Embedded_prop
+	if m.props.OtherEmbeddedProps != nil {
+		attrs.OtherEmbeddedAttr = &OtherEmbeddedAttr{Other_embedded_attr: m.props.OtherEmbeddedProps.Other_embedded_prop}
+	}
+
+	props := bazel.BazelTargetModuleProperties{
+		Rule_class: "custom",
+	}
+
+	ctx.CreateBazelTargetModule(props, android.CommonAttributes{Name: m.Name()}, attrs)
 }
 
 // A bp2build mutator that uses load statements and creates a 1:M mapping from
 // module to target.
-func customBp2BuildMutatorFromStarlark(ctx android.TopDownMutatorContext) {
-	if m, ok := ctx.Module().(*customModule); ok {
-		if !m.ConvertWithBp2build(ctx) {
-			return
-		}
+func customBp2buildOneToMany(ctx android.TopDownMutatorContext, m *customModule) {
 
-		baseName := m.Name()
-		attrs := &customBazelModuleAttributes{}
+	baseName := m.Name()
+	attrs := &customBazelModuleAttributes{}
 
-		myLibraryProps := bazel.BazelTargetModuleProperties{
-			Rule_class:        "my_library",
-			Bzl_load_location: "//build/bazel/rules:rules.bzl",
-		}
-		ctx.CreateBazelTargetModule(myLibraryProps, android.CommonAttributes{Name: baseName}, attrs)
-
-		protoLibraryProps := bazel.BazelTargetModuleProperties{
-			Rule_class:        "proto_library",
-			Bzl_load_location: "//build/bazel/rules:proto.bzl",
-		}
-		ctx.CreateBazelTargetModule(protoLibraryProps, android.CommonAttributes{Name: baseName + "_proto_library_deps"}, attrs)
-
-		myProtoLibraryProps := bazel.BazelTargetModuleProperties{
-			Rule_class:        "my_proto_library",
-			Bzl_load_location: "//build/bazel/rules:proto.bzl",
-		}
-		ctx.CreateBazelTargetModule(myProtoLibraryProps, android.CommonAttributes{Name: baseName + "_my_proto_library_deps"}, attrs)
+	myLibraryProps := bazel.BazelTargetModuleProperties{
+		Rule_class:        "my_library",
+		Bzl_load_location: "//build/bazel/rules:rules.bzl",
 	}
+	ctx.CreateBazelTargetModule(myLibraryProps, android.CommonAttributes{Name: baseName}, attrs)
+
+	protoLibraryProps := bazel.BazelTargetModuleProperties{
+		Rule_class:        "proto_library",
+		Bzl_load_location: "//build/bazel/rules:proto.bzl",
+	}
+	ctx.CreateBazelTargetModule(protoLibraryProps, android.CommonAttributes{Name: baseName + "_proto_library_deps"}, attrs)
+
+	myProtoLibraryProps := bazel.BazelTargetModuleProperties{
+		Rule_class:        "my_proto_library",
+		Bzl_load_location: "//build/bazel/rules:proto.bzl",
+	}
+	ctx.CreateBazelTargetModule(myProtoLibraryProps, android.CommonAttributes{Name: baseName + "_my_proto_library_deps"}, attrs)
 }
 
 // Helper method for tests to easily access the targets in a dir.
@@ -353,7 +348,6 @@
 
 func registerCustomModuleForBp2buildConversion(ctx *android.TestContext) {
 	ctx.RegisterModuleType("custom", customModuleFactory)
-	ctx.RegisterBp2BuildMutator("custom", customBp2BuildMutator)
 	ctx.RegisterForBazelConversion()
 }