programmatically adapt module to component in compiler

JS/wasm/crates/cli/Cargo.toml

@@ -13,8 +13,9 @@ path = "src/main.rs"
 [dependencies]
 wizer = { workspace = true }
 anyhow = { workspace = true }
-clap = { version = "4.1.4", features = [ "derive" ] }
+clap = { version = "4.1.4", features = ["derive"] }
 binaryen = { git = "https://github.com/pepyakin/binaryen-rs" }
+wit-component = { version = "0.208.1" }
 
 [build-dependencies]
 anyhow = "1.0.79"

JS/wasm/crates/cli/build.rs

@@ -7,6 +7,11 @@ use std::path::{Path, PathBuf};
 use anyhow::Result;
 
 fn main() -> Result<()> {
+    let out_dir = PathBuf::from(env::var("OUT_DIR")?);
+    // copy wasi_snapshot_preview1.reactor.wasm file from current directory to OUT_DIR
+    fs::copy("wasi_snapshot_preview1.reactor.wasm", out_dir.join("adapter.wasm"))?;
+    println!("cargo:rerun-if-changed=wasi_snapshot_preview1.reactor.wasm");
+    println!("cargo:warning=copied wasi_snapshot_preview1.reactor.wasm to adapter.wasm in OUT_DIR");
     if let Ok("cargo-clippy") = env::var("CARGO_CFG_FEATURE").as_ref().map(String::as_str) {
         stub_javy_core_for_clippy()
     } else {

JS/wasm/crates/cli/src/main.rs

@@ -9,6 +9,7 @@ use std::io::Read;
 use std::process::Command;
 use std::{env, fs::File, path::PathBuf};
 use wizer::Wizer;
+use wit_component::ComponentEncoder;
 
 const VERSION: &str = env!("CARGO_PKG_VERSION");
 
@@ -63,6 +64,14 @@ fn main() -> Result<()> {
             bail!("Unable to read wasm binary for wasm-opt optimizations");
         }
 
+        println!("Adapting module for component model");
+        let adapter_path = concat!(env!("OUT_DIR"), "/adapter.wasm");
+        wasm = ComponentEncoder::default()
+        .validate(true)
+        .module(&wasm)?
+        .adapter("wasi_snapshot_preview1", &fs::read(adapter_path).expect("Unable to read adapter"))?
+        .encode()?;
+
         fs::write(&opts.output, wasm)?;
         return Ok(());
     }