diff --git a/apex/bp2build.go b/apex/bp2build.go
index d28f512..a3dda83 100644
--- a/apex/bp2build.go
+++ b/apex/bp2build.go
@@ -15,16 +15,22 @@
 
 import (
 	"android/soong/android"
+	"encoding/json"
 	"strings"
 )
 
 // This file contains the bp2build integration for the apex package.
 
 // Export constants as Starlark using bp2build to Bazel.
-func BazelApexToolchainVars() string {
+func BazelApexToolchainVars() (string, error) {
+	marshalled, err := json.Marshal(apexAvailBaseline)
+	if err != nil {
+		return "", err
+	}
 	content := []string{
 		"# GENERATED BY SOONG. DO NOT EDIT.",
 		"default_manifest_version = " + android.DefaultUpdatableModuleVersion, // constants.go is different in every branch.
+		"apex_available_baseline = json.decode('''" + string(marshalled) + "''')",
 	}
-	return strings.Join(content, "\n")
+	return strings.Join(content, "\n"), nil
 }
diff --git a/bp2build/bp2build.go b/bp2build/bp2build.go
index 86b9b27..062eba8 100644
--- a/bp2build/bp2build.go
+++ b/bp2build/bp2build.go
@@ -45,8 +45,12 @@
 	bp2buildFiles := CreateBazelFiles(ctx.Config(), nil, res.buildFileToTargets, ctx.mode)
 	writeFiles(ctx, bp2buildDir, bp2buildFiles)
 
-	soongInjectionDir := android.PathForOutput(ctx, bazel.SoongInjectionDirName)
-	writeFiles(ctx, soongInjectionDir, CreateSoongInjectionDirFiles(ctx, res.metrics))
+	injectionFiles, err := CreateSoongInjectionDirFiles(ctx, res.metrics)
+	if err != nil {
+		fmt.Printf("%s\n", err.Error())
+		os.Exit(1)
+	}
+	writeFiles(ctx, android.PathForOutput(ctx, bazel.SoongInjectionDirName), injectionFiles)
 
 	return &res.metrics
 }
@@ -55,17 +59,20 @@
 // This includes
 // 1. config value(s) that are hardcoded in Soong
 // 2. product_config variables
-func CreateSoongInjectionDirFiles(ctx *CodegenContext, metrics CodegenMetrics) []BazelFile {
+func CreateSoongInjectionDirFiles(ctx *CodegenContext, metrics CodegenMetrics) ([]BazelFile, error) {
 	var ret []BazelFile
 
 	productConfigFiles, err := CreateProductConfigFiles(ctx)
 	if err != nil {
-		fmt.Printf("ERROR: %s", err.Error())
-		os.Exit(1)
+		return nil, err
 	}
 	ret = append(ret, productConfigFiles...)
-	ret = append(ret, soongInjectionFiles(ctx.Config(), metrics)...)
-	return ret
+	injectionFiles, err := soongInjectionFiles(ctx.Config(), metrics)
+	if err != nil {
+		return nil, err
+	}
+	ret = append(ret, injectionFiles...)
+	return ret, nil
 }
 
 // Get the output directory and create it if it doesn't exist.
diff --git a/bp2build/conversion.go b/bp2build/conversion.go
index 5b3e19f..73df675 100644
--- a/bp2build/conversion.go
+++ b/bp2build/conversion.go
@@ -22,7 +22,7 @@
 }
 
 // PRIVATE: Use CreateSoongInjectionDirFiles instead
-func soongInjectionFiles(cfg android.Config, metrics CodegenMetrics) []BazelFile {
+func soongInjectionFiles(cfg android.Config, metrics CodegenMetrics) ([]BazelFile, error) {
 	var files []BazelFile
 
 	files = append(files, newFile("android", GeneratedBuildFileName, "")) // Creates a //cc_toolchain package.
@@ -36,7 +36,11 @@
 	files = append(files, newFile("java_toolchain", "constants.bzl", java_config.BazelJavaToolchainVars(cfg)))
 
 	files = append(files, newFile("apex_toolchain", GeneratedBuildFileName, "")) // Creates a //apex_toolchain package.
-	files = append(files, newFile("apex_toolchain", "constants.bzl", apex.BazelApexToolchainVars()))
+	apexToolchainVars, err := apex.BazelApexToolchainVars()
+	if err != nil {
+		return nil, err
+	}
+	files = append(files, newFile("apex_toolchain", "constants.bzl", apexToolchainVars))
 
 	files = append(files, newFile("metrics", "converted_modules.txt", strings.Join(metrics.Serialize().ConvertedModules, "\n")))
 
@@ -52,7 +56,7 @@
 
 	apiLevelsContent, err := json.Marshal(android.GetApiLevelsMap(cfg))
 	if err != nil {
-		panic(err)
+		return nil, err
 	}
 	files = append(files, newFile("api_levels", GeneratedBuildFileName, `exports_files(["api_levels.json"])`))
 	files = append(files, newFile("api_levels", "api_levels.json", string(apiLevelsContent)))
@@ -64,7 +68,7 @@
 	files = append(files, newFile("allowlists", "mixed_build_prod_allowlist.txt", strings.Join(android.GetBazelEnabledModules(android.BazelProdMode), "\n")+"\n"))
 	files = append(files, newFile("allowlists", "mixed_build_staging_allowlist.txt", strings.Join(android.GetBazelEnabledModules(android.BazelStagingMode), "\n")+"\n"))
 
-	return files
+	return files, nil
 }
 
 func CreateBazelFiles(
diff --git a/bp2build/conversion_test.go b/bp2build/conversion_test.go
index 8c24093..8c1d2ae 100644
--- a/bp2build/conversion_test.go
+++ b/bp2build/conversion_test.go
@@ -84,8 +84,10 @@
 
 func TestCreateBazelFiles_Bp2Build_CreatesDefaultFiles(t *testing.T) {
 	testConfig := android.TestConfig("", make(map[string]string), "", make(map[string][]byte))
-	files := soongInjectionFiles(testConfig, CreateCodegenMetrics())
-
+	files, err := soongInjectionFiles(testConfig, CreateCodegenMetrics())
+	if err != nil {
+		t.Error(err)
+	}
 	expectedFilePaths := []bazelFilepath{
 		{
 			dir:      "android",
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index c005f7c..5f27fa7 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -178,7 +178,8 @@
 	ninjaDeps = append(ninjaDeps, codegenContext.AdditionalNinjaDeps()...)
 
 	// Create soong_injection repository
-	soongInjectionFiles := bp2build.CreateSoongInjectionDirFiles(codegenContext, bp2build.CreateCodegenMetrics())
+	soongInjectionFiles, err := bp2build.CreateSoongInjectionDirFiles(codegenContext, bp2build.CreateCodegenMetrics())
+	maybeQuit(err, "")
 	absoluteSoongInjectionDir := shared.JoinPath(topDir, ctx.Config().SoongOutDir(), bazel.SoongInjectionDirName)
 	for _, file := range soongInjectionFiles {
 		// The API targets in api_bp2build workspace do not have any dependency on api_bp2build.