From 5bd94b8f47efab5ca736e6ec76b72e991df1da11 Mon Sep 17 00:00:00 2001
From: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
Date: Sun, 25 Jun 2023 11:43:54 -0700
Subject: Add `process.mainModule`

---
 src/bun.js/bindings/Process.cpp        | 12 ++++++++++++
 test/cli/run/require-cache-fixture.cjs |  5 +++++
 2 files changed, 17 insertions(+)

diff --git a/src/bun.js/bindings/Process.cpp b/src/bun.js/bindings/Process.cpp
index 69ee11e60..a369faee2 100644
--- a/src/bun.js/bindings/Process.cpp
+++ b/src/bun.js/bindings/Process.cpp
@@ -10,6 +10,7 @@
 #include "ImportMetaObject.h"
 #include <sys/stat.h>
 #include "ZigConsoleClient.h"
+#include <JavaScriptCore/GetterSetter.h>
 #pragma mark - Node.js Process
 
 namespace Zig {
@@ -787,6 +788,17 @@ void Process::finishCreation(JSC::VM& vm)
 
     this->putDirectNativeFunction(vm, globalObject, JSC::Identifier::fromString(this->vm(), "emitWarning"_s),
         1, Process_emitWarning, ImplementationVisibility::Public, NoIntrinsic, 0);
+
+    JSC::JSFunction* requireDotMainFunction = JSFunction::create(
+        vm,
+        moduleMainCodeGenerator(vm),
+        globalObject->globalScope());
+    // https://nodejs.org/api/process.html#processmainmodule
+    this->putDirect(
+        vm,
+        JSC::Identifier::fromString(vm, "mainModule"_s),
+        JSC::GetterSetter::create(vm, globalObject, requireDotMainFunction, JSValue()),
+        PropertyAttribute::Builtin | PropertyAttribute::Accessor | PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum | 0);
 }
 
 const JSC::ClassInfo Process::s_info = { "Process"_s, &Base::s_info, nullptr, nullptr,
diff --git a/test/cli/run/require-cache-fixture.cjs b/test/cli/run/require-cache-fixture.cjs
index ce02b86d7..838be9ceb 100644
--- a/test/cli/run/require-cache-fixture.cjs
+++ b/test/cli/run/require-cache-fixture.cjs
@@ -8,6 +8,11 @@ if (require.main !== module) {
   throw new Error("require.main !== module");
 }
 
+if (process.mainModule !== module) {
+  console.error(__filename, module.id);
+  throw new Error("process.mainModule !== module");
+}
+
 if (__filename !== resolve(module.filename)) {
   console.error(__filename, module.id);
   throw new Error("__filename !== module.id");
-- 
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