build a smaller wasm file

README.md

@@ -33,7 +33,7 @@ ruby -run -e httpd . -p 8080
 
 ## Todo
 - [x] explain how to add  code outside gems to the image
-- [ ] show how to shrink/compress the ruby.wasm file (currently 51MB with debug info, but can be about 10mb or less.)
+- [X] ~~show how to shrink/compress the ruby.wasm file (currently 51MB with debug info, but can be about 10mb or less.)~~
 - [ ] license + explanation
 - [ ] ask upstream if they can make a javascript file that doesnt have the .wasm file path hardcoded. 
 - [ ] docker file
@@ -54,6 +54,7 @@ ruby -run -e httpd . -p 8080
 - [ruby.wasmでrequire_relativeを使えるようにしたい #Ruby - Qiita](https://qiita.com/ledsun/items/3f8ba1ee2699d546c18c#fetch%E3%81%8C%E9%9D%9E%E5%90%8C%E6%9C%9F%E9%96%A2%E6%95%B0)
 - [RubyでWebAssemblyを試してみよう #ruby #WebAssembly #WASM #WASI - クリエーションライン株式会社](https://www.creationline.com/tech-blog/60328)
 - [how_to_use_bundler_and_rubygems_on_wasm.md](https://gist.github.com/kateinoigakukun/5caf3b83b2732b1653e91b0e75ce3390)
+- [TODO: Shrinking .wasm Size](https://rustwasm.github.io/docs/book/reference/code-size.html)
 - see contributing.md in ruby.wasm repo
 
 ## GPT to convert JavaScript to Ruby code:

browser.script.iife.js

@@ -2100,8 +2100,7 @@ SOFTWARE.
        * an array of strings starting with the Ruby program name.
        */
       initialize(args = ["ruby.wasm", "-EUTF-8", "-e_=0"]) {
-          console.log("tests");
-            const c_args = args.map((arg) => arg + "\0");
+        const c_args = args.map((arg) => arg + "\0");
           this.guest.rubyInit();
           this.guest.rubySysinit(c_args);
           this.guest.rubyOptions(c_args);

build.sh

@@ -4,4 +4,8 @@ cd ruby.wasm
 bundle exec rake compile
 rake install
 cd ..
-bundle exec rbwasm --log-level debug build --ruby-version 3.3 --target wasm32-unknown-wasi --build-profile full  -o ruby-app.wasm
+bundle exec rbwasm --log-level debug build --ruby-version 3.3 --target wasm32-unknown-wasi --build-profile full  -o ruby-app.wasm
+# Remove the debug info
+wasm-opt --strip-debug ruby-app.wasm -o ruby-app.wasm
+# Optimize for size without hurting speed as much.
+wasm-opt ruby-app.wasm -Os -o ruby-app.wasm