Add deno example with wasm-gc

examples/deno/README.md

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+# Deno with MoonBit wasm gc
+
+deno version of wasm-gc example
+
+## Deps
+
+This example works with the following versions of the environment.
+
+```bash
+moon 0.1.0 (ee9885e 2024-04-15)
+moonc 3b02f89 2024-04-15
+deno 1.42.4
+```
+
+## How to run
+
+```bash
+moon build --target wasm-gc
+deno run --allow-read run.ts
+```

examples/deno/main/main.mbt

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+fn main {
+  println("hello")
+}

examples/deno/main/moon.pkg.json

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+{
+  "is_main": true,
+  "import": {}
+}

examples/deno/moon.mod.json

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+{
+  "name": "hello"
+}

examples/deno/run.ts

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+let memory: WebAssembly.Memory;
+const [log, flush] = (() => {
+  let buffer: number[] = [];
+  function flush() {
+    if (buffer.length > 0) {
+      console.log(new TextDecoder("utf-16").decode(new Uint16Array(buffer).valueOf()));
+      buffer = [];
+    }
+  }
+  function log(ch: number) {
+    if (ch == '\n'.charCodeAt(0)) { flush(); }
+    else if (ch == '\r'.charCodeAt(0)) { /* noop */ }
+    else { buffer.push(ch); }
+  }
+  return [log, flush]
+})();
+
+const importObject = {
+  spectest: {
+    print_char: log
+  },
+  js_string: {
+    new: (offset: number, length: number) => {
+      const bytes = new Uint16Array(memory.buffer, offset, length);
+      const string = new TextDecoder("utf-16").decode(bytes);
+      return string
+    },
+    empty: () => { return "" },
+    log: (string: string) => { console.log(string) },
+    append: (s1: string, s2: string) => { return (s1 + s2) },
+  }
+};
+
+const { instance } = await WebAssembly.instantiateStreaming(
+  fetch(new URL("./target/wasm-gc/release/build/main/main.wasm", import.meta.url)),
+  importObject
+);
+memory = instance.exports["moonbit.memory"] as WebAssembly.Memory;
+// @ts-expect-error
+instance.exports._start();
+flush();

examples/deno/tsconfig.json

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+{
+  // just skip the type checking
+  "compilerOptions": {
+    "target": "esnext",
+    "module": "esnext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "noEmit": true,
+    "allowImportingTsExtensions": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true
+  }
+}