Refactor RubyVM initialization to require Bundler setup conditionally

Author: ledsun

packages/npm-packages/ruby-wasm-wasi/src/vm.ts

@@ -331,13 +331,13 @@ export class RubyVM {
   initialize(args: string[] = ["ruby.wasm", "-EUTF-8", "-e_=0"]) {
     const c_args = args.map((arg) => arg + "\0");
     this.guest.rubyInit(c_args);
-        try {
-            this.eval(`
-        # Ruby can expose Gem before rubygems.rb finishes setting up its API.
-        # Load RubyGems explicitly so Bundler standalone does not see a partial Gem module.
-        require "rubygems" if defined?(Gem) && !Gem.respond_to?(:ruby_api_version)
+    try {
+      this.eval(`
         # Require Bundler standalone setup
         if File.exist?("/bundle/bundler/setup.rb")
+          # Ruby can expose Gem before rubygems.rb finishes setting up its API.
+          # Load RubyGems explicitly so Bundler standalone does not see a partial Gem module.
+          require "rubygems" if defined?(Gem) && !Gem.respond_to?(:ruby_api_version)
           require "/bundle/bundler/setup.rb"
         elsif File.exist?("/bundle/setup.rb")
           # For non-CM builds, which doesn't use Bundler's standalone mode