Prune unused code-mode globals (#20542)

Hide Atomics, SharedArrayBuffer, and WebAssembly from the code-mode
runtime since the harness does not expose worker support or need those
APIs.

codex-rs/code-mode/src/runtime/globals.rs

@@ -12,11 +12,10 @@ use super::callbacks::yield_control_callback;
 
 pub(super) fn install_globals(scope: &mut v8::PinScope<'_, '_>) -> Result<(), String> {
     let global = scope.get_current_context().global(scope);
-    let console = v8::String::new(scope, "console")
-        .ok_or_else(|| "failed to allocate global `console`".to_string())?;
-    if global.delete(scope, console.into()) != Some(true) {
-        return Err("failed to remove global `console`".to_string());
-    }
+    delete_global(scope, global, "console")?;
+    delete_global(scope, global, "Atomics")?;
+    delete_global(scope, global, "SharedArrayBuffer")?;
+    delete_global(scope, global, "WebAssembly")?;
 
     let tools = build_tools_object(scope)?;
     let all_tools = build_all_tools_value(scope)?;
@@ -142,3 +141,17 @@ fn set_global<'s>(
         Err(format!("failed to set global `{name}`"))
     }
 }
+
+fn delete_global<'s>(
+    scope: &mut v8::PinScope<'s, '_>,
+    global: v8::Local<'s, v8::Object>,
+    name: &str,
+) -> Result<(), String> {
+    let key = v8::String::new(scope, name)
+        .ok_or_else(|| format!("failed to allocate global `{name}`"))?;
+    if global.delete(scope, key.into()) == Some(true) {
+        Ok(())
+    } else {
+        Err(format!("failed to remove global `{name}`"))
+    }
+}

codex-rs/core/tests/suite/code_mode.rs

@@ -2371,7 +2371,6 @@ text(JSON.stringify(Object.getOwnPropertyNames(globalThis).sort()));
         "Array",
         "ArrayBuffer",
         "AsyncDisposableStack",
-        "Atomics",
         "BigInt",
         "BigInt64Array",
         "BigUint64Array",
@@ -2406,7 +2405,6 @@ text(JSON.stringify(Object.getOwnPropertyNames(globalThis).sort()));
         "Reflect",
         "RegExp",
         "Set",
-        "SharedArrayBuffer",
         "String",
         "SuppressedError",
         "Symbol",
@@ -2421,7 +2419,6 @@ text(JSON.stringify(Object.getOwnPropertyNames(globalThis).sort()));
         "WeakMap",
         "WeakRef",
         "WeakSet",
-        "WebAssembly",
         "__codexContentItems",
         "add_content",
         "decodeURI",