fully working example

build.zig

@@ -1,5 +1,5 @@
 const std = @import("std");
-const universal_lambda_build = @import("universal_lambda_build");
+const configureUniversalLambdaBuild = @import("universal_lambda_build").configureBuild;
 
 // Although this function looks imperative, note that its job is to
 // declaratively construct a build graph that will be executed by an external
@@ -25,7 +25,8 @@ pub fn build(b: *std.Build) !void {
         .optimize = optimize,
     });
 
-    try universal_lambda_build.configureBuild(b, exe);
+    // All modules should be added before this is called
+    try configureUniversalLambdaBuild(b, exe);
 
     // This declares intent for the executable to be installed into the
     // standard location when the user invokes the "install" step (the default

src/main.zig

@@ -5,9 +5,9 @@ pub fn main() !void {
     try universal_lambda.run(null, handler);
 }
 
-fn handler(allocator: std.mem.Allocator, event_data: []const u8, context: universal_lambda.Context) ![]const u8 {
-    _ = allocator;
+pub fn handler(allocator: std.mem.Allocator, event_data: []const u8, context: universal_lambda.Context) ![]const u8 {
     _ = event_data;
+    _ = allocator;
     _ = context;
     return "hello world";
 }