Set JS runtime config from CLI for static modules (#736)

crates/cli/Cargo.toml

@@ -33,6 +33,7 @@ convert_case = "0.6.0"
 wasm-opt = "0.116.1"
 tempfile = { workspace = true }
 clap = { version = "4.5.15", features = ["derive"] }
+javy-config = { workspace = true }
 
 [dev-dependencies]
 serde_json = "1.0"

crates/cli/src/codegen/static.rs

@@ -1,6 +1,7 @@
 use std::{collections::HashMap, fs, rc::Rc, sync::OnceLock};
 
 use anyhow::Result;
+use javy_config::Config;
 use walrus::{DataKind, ExportItem, FunctionBuilder, FunctionId, MemoryId, ValType};
 use wasi_common::{pipe::ReadPipe, sync::WasiCtxBuilder, WasiCtx};
 use wasm_opt::{OptimizationOptions, ShrinkLevel};
@@ -69,6 +70,10 @@ impl CodeGen for StaticGenerator {
             WASI.get_mut()
                 .unwrap()
                 .set_stdin(Box::new(ReadPipe::from(js.as_bytes())));
+
+            WASI.get_mut()
+                .unwrap()
+                .push_env("JS_RUNTIME_CONFIG", &Config::all().bits().to_string())?;
         };
 
         let wasm = Wizer::new()

crates/core/src/main.rs

@@ -2,9 +2,9 @@ use anyhow::anyhow;
 use javy::Runtime;
 use once_cell::sync::OnceCell;
 use std::io::{self, Read};
-use std::slice;
 use std::str;
 use std::string::String;
+use std::{env, slice};
 
 use javy_config::Config;
 mod execution;
@@ -19,7 +19,15 @@ static mut BYTECODE: OnceCell<Vec<u8>> = OnceCell::new();
 pub extern "C" fn init() {
     let _wasm_ctx = WasmCtx::new();
 
-    let runtime = runtime::new(Config::all()).unwrap();
+    let js_runtime_config = Config::from_bits(
+        env::var("JS_RUNTIME_CONFIG")
+            .expect("JS_RUNTIME_CONFIG should be set")
+            .parse()
+            .expect("JS_RUNTIME_CONFIG should be a u32"),
+    )
+    .expect("JS_RUNTIME_CONFIG should only contain valid flags");
+
+    let runtime = runtime::new(js_runtime_config).unwrap();
 
     let mut contents = String::new();
     io::stdin().read_to_string(&mut contents).unwrap();