diff --git a/oxlint.json b/oxlint.json
index 8749f00f9d..352d94e287 100644
--- a/oxlint.json
+++ b/oxlint.json
@@ -31,7 +31,8 @@
     "test/bundler/native-plugin.test.ts", // parser doesn't handle import metadata
     "test/bundler/transpiler/with-statement-works.js", // parser doesn't allow `with` statement
     "test/js/node/module/extensions-fixture", // these files are not meant to be linted
-    "test/cli/run/module-type-fixture"
+    "test/cli/run/module-type-fixture",
+    "test/bundler/transpiler/with-statement-works.js" // parser doesn't allow `with` statement
   ],
   "overrides": [
     {
diff --git a/src/bun.js/bindings/JSCommonJSExtensions.cpp b/src/bun.js/bindings/JSCommonJSExtensions.cpp
deleted file mode 100644
index d1c511847c..0000000000
--- a/src/bun.js/bindings/JSCommonJSExtensions.cpp
+++ /dev/null
@@ -1,181 +0,0 @@
-#include "JSCommonJSExtensions.h"
-#include "ZigGlobalObject.h"
-
-namespace Bun {
-using namespace JSC;
-
-const JSC::ClassInfo JSCommonJSExtensions::s_info = { "CommonJSExtensions"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSCommonJSExtensions) };
-
-// These functions are implemented as no-ops because it doesn't seem like any
-// projects call them directly. They are defined separately so that assigning
-// one to the other can be detected and use the corresponding loader.
-JSC_DEFINE_HOST_FUNCTION(jsLoaderJS, (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
-{
-    auto scope = DECLARE_THROW_SCOPE(globalObject->vm());
-    throwTypeError(globalObject, scope, "Calling Module._extensions[\".js\"] directly is not implemented."_s);
-    return JSValue::encode({});
-}
-JSC_DEFINE_HOST_FUNCTION(jsLoaderJSON, (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
-{
-    auto scope = DECLARE_THROW_SCOPE(globalObject->vm());
-    throwTypeError(globalObject, scope, "Calling Module._extensions[\".json\"] directly is not implemented."_s);
-    return JSValue::encode({});
-}
-JSC_DEFINE_HOST_FUNCTION(jsLoaderNode, (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
-{
-    auto scope = DECLARE_THROW_SCOPE(globalObject->vm());
-    throwTypeError(globalObject, scope, "Calling Module._extensions[\".node\"] directly is not implemented."_s);
-    return JSValue::encode({});
-}
-JSC_DEFINE_HOST_FUNCTION(jsLoaderTS, (JSC::JSGlobalObject * globalObject, JSC::CallFrame* callFrame))
-{
-    auto scope = DECLARE_THROW_SCOPE(globalObject->vm());
-    throwTypeError(globalObject, scope, "Calling Module._extensions[\".ts\"] directly is not implemented."_s);
-    return JSValue::encode({});
-}
-
-void JSCommonJSExtensions::finishCreation(JSC::VM& vm)
-{
-    Base::finishCreation(vm);
-    ASSERT(inherits(info()));
-
-    Zig::GlobalObject* global = defaultGlobalObject(globalObject());
-    JSC::JSFunction* fnLoadJS = JSC::JSFunction::create(
-        vm,
-        global,
-        2,
-        ""_s,
-        jsLoaderJS,
-        JSC::ImplementationVisibility::Public,
-        JSC::Intrinsic::NoIntrinsic,
-        JSC::callHostFunctionAsConstructor);
-    JSC::JSFunction* fnLoadJSON = JSC::JSFunction::create(
-        vm,
-        global,
-        2,
-        ""_s,
-        jsLoaderJSON,
-        JSC::ImplementationVisibility::Public,
-        JSC::Intrinsic::NoIntrinsic,
-        JSC::callHostFunctionAsConstructor);
-    JSC::JSFunction* fnLoadNode = JSC::JSFunction::create(
-        vm,
-        global,
-        2,
-        ""_s,
-        jsLoaderNode,
-        JSC::ImplementationVisibility::Public,
-        JSC::Intrinsic::NoIntrinsic,
-        JSC::callHostFunctionAsConstructor);
-    JSC::JSFunction* fnLoadTS = JSC::JSFunction::create(
-        vm,
-        global,
-        2,
-        ""_s,
-        jsLoaderTS,
-        JSC::ImplementationVisibility::Public,
-        JSC::Intrinsic::NoIntrinsic,
-        JSC::callHostFunctionAsConstructor);
-
-    this->putDirect(vm, JSC::Identifier::fromString(vm, ".js"_s), fnLoadJS, 0);
-    this->putDirect(vm, JSC::Identifier::fromString(vm, ".json"_s), fnLoadJSON, 0);
-    this->putDirect(vm, JSC::Identifier::fromString(vm, ".node"_s), fnLoadNode, 0);
-    this->putDirect(vm, JSC::Identifier::fromString(vm, ".ts"_s), fnLoadTS, 0);
-    this->putDirect(vm, JSC::Identifier::fromString(vm, ".cts"_s), fnLoadTS, 0);
-    this->putDirect(vm, JSC::Identifier::fromString(vm, ".mjs"_s), fnLoadJS, 0);
-    this->putDirect(vm, JSC::Identifier::fromString(vm, ".mts"_s), fnLoadTS, 0);
-}
-
-extern "C" void NodeModuleModule__onRequireExtensionModify(
-    Zig::GlobalObject* globalObject,
-    const BunString* key,
-    uint32_t kind,
-    JSC::JSValue value);
-
-void onAssign(Zig::GlobalObject* globalObject, JSC::PropertyName propertyName, JSC::JSValue value)
-{
-    if (propertyName.isSymbol()) return;
-    auto* name = propertyName.publicName();
-    if (!name->startsWith("."_s)) return;
-    BunString ext = Bun::toString(name);
-    uint32_t kind = 0;
-    if (value.isCallable()) {
-        JSC::CallData callData = JSC::getCallData(value);
-        if (callData.type == JSC::CallData::Type::Native) {
-            auto* untaggedPtr = callData.native.function.untaggedPtr();
-            if (untaggedPtr == &jsLoaderJS) {
-                kind = 1;
-            } else if (untaggedPtr == &jsLoaderJSON) {
-                kind = 2;
-            } else if (untaggedPtr == &jsLoaderNode) {
-                kind = 3;
-            } else if (untaggedPtr == &jsLoaderTS) {
-                kind = 4;
-            }
-        }
-    } else {
-        kind = -1;
-    }
-    NodeModuleModule__onRequireExtensionModify(globalObject, &ext, kind, value);
-}
-
-bool JSCommonJSExtensions::defineOwnProperty(JSC::JSObject* object, JSC::JSGlobalObject* globalObject, JSC::PropertyName propertyName, const JSC::PropertyDescriptor& descriptor, bool shouldThrow)
-{
-    JSValue value = descriptor.value();
-    if (value) {
-        onAssign(defaultGlobalObject(globalObject), propertyName, value);
-    } else {
-        onAssign(defaultGlobalObject(globalObject), propertyName, JSC::jsUndefined());
-    }
-    return Base::defineOwnProperty(object, globalObject, propertyName, descriptor, shouldThrow);
-}
-
-bool JSCommonJSExtensions::put(JSC::JSCell* cell, JSC::JSGlobalObject* globalObject, JSC::PropertyName propertyName, JSC::JSValue value, JSC::PutPropertySlot& slot)
-{
-    onAssign(defaultGlobalObject(globalObject), propertyName, value);
-    return Base::put(cell, globalObject, propertyName, value, slot);
-}
-
-bool JSCommonJSExtensions::deleteProperty(JSC::JSCell* cell, JSC::JSGlobalObject* globalObject, JSC::PropertyName propertyName, JSC::DeletePropertySlot& slot)
-{
-    bool deleted = Base::deleteProperty(cell, globalObject, propertyName, slot);
-    if (deleted) {
-        onAssign(defaultGlobalObject(globalObject), propertyName, JSC::jsUndefined());
-    }
-    return deleted;
-}
-
-extern "C" uint32_t JSCommonJSExtensions__appendFunction(Zig::GlobalObject* globalObject, JSC::JSValue value)
-{
-    JSCommonJSExtensions* extensions = globalObject->lazyRequireExtensionsObject();
-    extensions->m_registeredFunctions.append(JSC::WriteBarrier<Unknown>());
-    extensions->m_registeredFunctions.last().set(globalObject->vm(), extensions, value);
-    return extensions->m_registeredFunctions.size() - 1;
-}
-
-extern "C" void JSCommonJSExtensions__setFunction(Zig::GlobalObject* globalObject, uint32_t index, JSC::JSValue value)
-{
-    JSCommonJSExtensions* extensions = globalObject->lazyRequireExtensionsObject();
-    extensions->m_registeredFunctions[index].set(globalObject->vm(), globalObject, value);
-}
-
-extern "C" uint32_t JSCommonJSExtensions__swapRemove(Zig::GlobalObject* globalObject, uint32_t index)
-{
-    JSCommonJSExtensions* extensions = globalObject->lazyRequireExtensionsObject();
-    ASSERT(extensions->m_registeredFunctions.size() > 0);
-    if (extensions->m_registeredFunctions.size() == 1) {
-        extensions->m_registeredFunctions.clear();
-        return index;
-    }
-    ASSERT(index < extensions->m_registeredFunctions.size());
-    if (index < (extensions->m_registeredFunctions.size() - 1)) {
-        JSValue last = extensions->m_registeredFunctions.takeLast().get();
-        extensions->m_registeredFunctions[index].set(globalObject->vm(), globalObject, last);
-        return extensions->m_registeredFunctions.size();
-    } else {
-        extensions->m_registeredFunctions.removeLast();
-        return index;
-    }
-}
-
-} // namespace Bun
diff --git a/src/bun.js/bindings/JSCommonJSExtensions.h b/src/bun.js/bindings/JSCommonJSExtensions.h
deleted file mode 100644
index 1e7f13b1e7..0000000000
--- a/src/bun.js/bindings/JSCommonJSExtensions.h
+++ /dev/null
@@ -1,58 +0,0 @@
-#pragma once
-#include "root.h"
-#include "headers-handwritten.h"
-#include "BunClientData.h"
-
-namespace Bun {
-
-// require.extensions & Module._extensions
-class JSCommonJSExtensions : public JSC::JSDestructibleObject {
-public:
-    using Base = JSC::JSDestructibleObject;
-    static constexpr unsigned StructureFlags = Base::StructureFlags | JSC::OverridesPut;
-    ~JSCommonJSExtensions();
-
-    WTF::Vector<JSC::WriteBarrier<JSC::Unknown>> m_registeredFunctions;
-
-    static JSCommonJSExtensions* create(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::Structure* structure)
-    {
-        JSCommonJSExtensions* ptr = new (NotNull, JSC::allocateCell<JSCommonJSExtensions>(vm)) JSCommonJSExtensions(vm, structure);
-        ptr->finishCreation(vm);
-        return ptr;
-    }
-
-    DECLARE_INFO;
-
-    template<typename, JSC::SubspaceAccess mode>
-    static JSC::GCClient::IsoSubspace* subspaceFor(JSC::VM& vm)
-    {
-        if constexpr (mode == JSC::SubspaceAccess::Concurrently)
-            return nullptr;
-        return WebCore::subspaceForImpl<JSCommonJSExtensions, WebCore::UseCustomHeapCellType::No>(
-            vm,
-            [](auto& spaces) { return spaces.m_clientSubspaceForJSCommonJSExtensions.get(); },
-            [](auto& spaces, auto&& space) { spaces.m_clientSubspaceForJSCommonJSExtensions = std::forward<decltype(space)>(space); },
-            [](auto& spaces) { return spaces.m_subspaceForJSCommonJSExtensions.get(); },
-            [](auto& spaces, auto&& space) { spaces.m_subspaceForJSCommonJSExtensions = std::forward<decltype(space)>(space); });
-    }
-
-    static JSC::Structure* createStructure(JSC::VM& vm, JSC::JSGlobalObject* globalObject, JSC::JSValue prototype)
-    {
-        return JSC::Structure::create(vm, globalObject, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), info());
-    }
-
-protected:
-    static bool defineOwnProperty(JSC::JSObject*, JSC::JSGlobalObject*, JSC::PropertyName, const JSC::PropertyDescriptor&, bool shouldThrow);
-    static bool put(JSC::JSCell*, JSC::JSGlobalObject*, JSC::PropertyName, JSC::JSValue, JSC::PutPropertySlot&);
-    static bool deleteProperty(JSC::JSCell*, JSC::JSGlobalObject*, JSC::PropertyName, JSC::DeletePropertySlot&);
-
-private:
-    JSCommonJSExtensions(JSC::VM& vm, JSC::Structure* structure)
-        : Base(vm, structure)
-    {
-    }
-
-    void finishCreation(JSC::VM&);
-};
-
-} // namespace Bun
diff --git a/src/bun.js/bindings/JSCommonJSModule.cpp b/src/bun.js/bindings/JSCommonJSModule.cpp
index d22f0a78cb..6b200709e2 100644
--- a/src/bun.js/bindings/JSCommonJSModule.cpp
+++ b/src/bun.js/bindings/JSCommonJSModule.cpp
@@ -76,7 +76,6 @@
 #include "wtf/NakedPtr.h"
 #include "wtf/URL.h"
 #include "wtf/text/StringImpl.h"
-#include "JSCommonJSExtensions.h"
 
 extern "C" bool Bun__isBunMain(JSC::JSGlobalObject* global, const BunString*);
 
@@ -299,31 +298,12 @@ JSC_DEFINE_CUSTOM_SETTER(jsRequireCacheSetter,
     return true;
 }
 
-JSC_DEFINE_CUSTOM_GETTER(jsRequireExtensionsGetter, (JSC::JSGlobalObject * globalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
-{
-    Zig::GlobalObject* thisObject = jsCast<Zig::GlobalObject*>(globalObject);
-    return JSValue::encode(thisObject->lazyRequireExtensionsObject());
-}
-
-JSC_DEFINE_CUSTOM_SETTER(jsRequireExtensionsSetter,
-    (JSC::JSGlobalObject * globalObject, JSC::EncodedJSValue thisValue,
-        JSC::EncodedJSValue value, JSC::PropertyName propertyName))
-{
-    JSObject* thisObject = jsDynamicCast<JSObject*>(JSValue::decode(thisValue));
-    if (!thisObject)
-        return false;
-
-    thisObject->putDirect(globalObject->vm(), propertyName, JSValue::decode(value), 0);
-    return true;
-}
-
 static const HashTableValue RequireResolveFunctionPrototypeValues[] = {
     { "paths"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, requireResolvePathsFunction, 1 } },
 };
 
 static const HashTableValue RequireFunctionPrototypeValues[] = {
     { "cache"_s, static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor), NoIntrinsic, { HashTableValue::GetterSetterType, jsRequireCacheGetter, jsRequireCacheSetter } },
-    { "extensions"_s, static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor), NoIntrinsic, { HashTableValue::GetterSetterType, jsRequireExtensionsGetter, jsRequireExtensionsSetter } },
 };
 
 Structure* RequireFunctionPrototype::createStructure(
@@ -386,6 +366,13 @@ void RequireFunctionPrototype::finishCreation(JSC::VM& vm)
         JSC::Identifier::fromString(vm, "main"_s),
         JSC::GetterSetter::create(vm, globalObject, requireDotMainFunction, requireDotMainFunction),
         PropertyAttribute::Accessor | PropertyAttribute::ReadOnly | 0);
+
+    auto extensions = constructEmptyObject(globalObject);
+    extensions->putDirect(vm, JSC::Identifier::fromString(vm, ".js"_s), jsBoolean(true), 0);
+    extensions->putDirect(vm, JSC::Identifier::fromString(vm, ".json"_s), jsBoolean(true), 0);
+    extensions->putDirect(vm, JSC::Identifier::fromString(vm, ".node"_s), jsBoolean(true), 0);
+
+    this->putDirect(vm, JSC::Identifier::fromString(vm, "extensions"_s), extensions, 0);
 }
 
 JSC_DEFINE_CUSTOM_GETTER(getterFilename, (JSC::JSGlobalObject * globalObject, JSC::EncodedJSValue thisValue, JSC::PropertyName))
@@ -1164,6 +1151,7 @@ JSC_DEFINE_HOST_FUNCTION(jsFunctionRequireCommonJS, (JSGlobalObject * lexicalGlo
     // This is always a new JSCommonJSModule object; cast cannot fail.
     JSCommonJSModule* child = jsCast<JSCommonJSModule*>(callframe->uncheckedArgument(1));
 
+    BunString specifierStr = Bun::toString(specifier);
     BunString referrerStr = Bun::toString(referrer);
     BunString typeAttributeStr = { BunStringTag::Dead };
     String typeAttribute = String();
@@ -1194,7 +1182,7 @@ JSC_DEFINE_HOST_FUNCTION(jsFunctionRequireCommonJS, (JSGlobalObject * lexicalGlo
         globalObject,
         child,
         specifierValue,
-        specifier,
+        &specifierStr,
         &referrerStr,
         LIKELY(typeAttribute.isEmpty())
             ? nullptr
diff --git a/src/bun.js/bindings/ModuleLoader.cpp b/src/bun.js/bindings/ModuleLoader.cpp
index ab9c46271b..baa549bf91 100644
--- a/src/bun.js/bindings/ModuleLoader.cpp
+++ b/src/bun.js/bindings/ModuleLoader.cpp
@@ -37,8 +37,6 @@
 #include "JSCommonJSModule.h"
 #include "../modules/_NativeModule.h"
 
-#include "JSCommonJSExtensions.h"
-
 namespace Bun {
 using namespace JSC;
 using namespace Zig;
@@ -569,39 +567,11 @@ JSValue resolveAndFetchBuiltinModule(
     return {};
 }
 
-void evaluateCommonJSCustomExtension(
-    Zig::GlobalObject* globalObject,
-    JSCommonJSModule* target,
-    String filename,
-    JSValue filenameValue,
-    uint32_t extensionIndex)
-{
-    auto& vm = globalObject->vm();
-    auto scope = DECLARE_THROW_SCOPE(vm);
-    Bun::JSCommonJSExtensions* extensions = globalObject->lazyRequireExtensionsObject();
-    JSValue extension = extensions->m_registeredFunctions[extensionIndex].get();
-
-    if (!extension || !extension.isCallable()) {
-        throwTypeError(globalObject, scope, makeString("require.extension is not a function"_s));
-        return;
-    }
-    JSC::CallData callData = JSC::getCallData(extension.asCell());
-    if (callData.type == JSC::CallData::Type::None) {
-        throwTypeError(globalObject, scope, makeString("require.extension is not a function"_s));
-        return;
-    }
-    MarkedArgumentBuffer arguments;
-    arguments.append(target);
-    arguments.append(filenameValue);
-    JSC::profiledCall(globalObject, ProfilingReason::API, extension, callData, target, arguments);
-    RETURN_IF_EXCEPTION(scope, );
-}
-
 JSValue fetchCommonJSModule(
     Zig::GlobalObject* globalObject,
     JSCommonJSModule* target,
     JSValue specifierValue,
-    String specifierWtfString,
+    BunString* specifier,
     BunString* referrer,
     BunString* typeAttribute)
 {
@@ -614,15 +584,13 @@ JSValue fetchCommonJSModule(
     ErrorableResolvedSource* res = &resValue;
     ResolvedSourceCodeHolder sourceCodeHolder(res);
 
-    BunString specifier = Bun::toString(specifierWtfString);
-
     bool wasModuleMock = false;
 
     // When "bun test" is enabled, allow users to override builtin modules
     // This is important for being able to trivially mock things like the filesystem.
     if (isBunTest) {
-        if (JSC::JSValue virtualModuleResult = Bun::runVirtualModule(globalObject, &specifier, wasModuleMock)) {
-            JSValue promiseOrCommonJSModule = handleVirtualModuleResult<true>(globalObject, virtualModuleResult, res, &specifier, referrer, wasModuleMock, target);
+        if (JSC::JSValue virtualModuleResult = Bun::runVirtualModule(globalObject, specifier, wasModuleMock)) {
+            JSValue promiseOrCommonJSModule = handleVirtualModuleResult<true>(globalObject, virtualModuleResult, res, specifier, referrer, wasModuleMock, target);
             RETURN_IF_EXCEPTION(scope, {});
 
             // If we assigned module.exports to the virtual module, we're done here.
@@ -638,7 +606,7 @@ JSValue fetchCommonJSModule(
                 RELEASE_AND_RETURN(scope, JSValue {});
             }
             case JSPromise::Status::Pending: {
-                JSC::throwTypeError(globalObject, scope, makeString("require() async module \""_s, specifierWtfString, "\" is unsupported. use \"await import()\" instead."_s));
+                JSC::throwTypeError(globalObject, scope, makeString("require() async module \""_s, specifier->toWTFString(BunString::ZeroCopy), "\" is unsupported. use \"await import()\" instead."_s));
                 RELEASE_AND_RETURN(scope, JSValue {});
             }
             case JSPromise::Status::Fulfilled: {
@@ -657,7 +625,7 @@ JSValue fetchCommonJSModule(
         }
     }
 
-    if (auto builtin = fetchBuiltinModuleWithoutResolution(globalObject, &specifier, res)) {
+    if (auto builtin = fetchBuiltinModuleWithoutResolution(globalObject, specifier, res)) {
         if (!res->success) {
             RELEASE_AND_RETURN(scope, builtin);
         }
@@ -668,8 +636,8 @@ JSValue fetchCommonJSModule(
 
     // When "bun test" is NOT enabled, disable users from overriding builtin modules
     if (!isBunTest) {
-        if (JSC::JSValue virtualModuleResult = Bun::runVirtualModule(globalObject, &specifier, wasModuleMock)) {
-            JSValue promiseOrCommonJSModule = handleVirtualModuleResult<true>(globalObject, virtualModuleResult, res, &specifier, referrer, wasModuleMock, target);
+        if (JSC::JSValue virtualModuleResult = Bun::runVirtualModule(globalObject, specifier, wasModuleMock)) {
+            JSValue promiseOrCommonJSModule = handleVirtualModuleResult<true>(globalObject, virtualModuleResult, res, specifier, referrer, wasModuleMock, target);
             RETURN_IF_EXCEPTION(scope, {});
 
             // If we assigned module.exports to the virtual module, we're done here.
@@ -685,7 +653,7 @@ JSValue fetchCommonJSModule(
                 RELEASE_AND_RETURN(scope, JSValue {});
             }
             case JSPromise::Status::Pending: {
-                JSC::throwTypeError(globalObject, scope, makeString("require() async module \""_s, specifierWtfString, "\" is unsupported. use \"await import()\" instead."_s));
+                JSC::throwTypeError(globalObject, scope, makeString("require() async module \""_s, specifier->toWTFString(BunString::ZeroCopy), "\" is unsupported. use \"await import()\" instead."_s));
                 RELEASE_AND_RETURN(scope, JSValue {});
             }
             case JSPromise::Status::Fulfilled: {
@@ -721,9 +689,9 @@ JSValue fetchCommonJSModule(
         RELEASE_AND_RETURN(scope, jsNumber(-1));
     }
 
-    Bun__transpileFile(bunVM, globalObject, &specifier, referrer, typeAttribute, res, false, true);
+    Bun__transpileFile(bunVM, globalObject, specifier, referrer, typeAttribute, res, false);
     if (res->success && res->result.value.isCommonJSModule) {
-        target->evaluate(globalObject, specifierWtfString, res->result.value);
+        target->evaluate(globalObject, specifier->toWTFString(BunString::ZeroCopy), res->result.value);
         RETURN_IF_EXCEPTION(scope, {});
         RELEASE_AND_RETURN(scope, target);
     }
@@ -765,10 +733,6 @@ JSValue fetchCommonJSModule(
         target->putDirect(vm, WebCore::clientData(vm)->builtinNames().exportsPublicName(), value, 0);
         target->hasEvaluated = true;
         RELEASE_AND_RETURN(scope, target);
-    } else if (res->result.value.tag == SyntheticModuleType::CommonJSCustomExtension) {
-        evaluateCommonJSCustomExtension(globalObject, target, specifierWtfString, specifierValue, res->result.value.cjsCustomExtensionIndex);
-        RETURN_IF_EXCEPTION(scope, {});
-        RELEASE_AND_RETURN(scope, target);
     }
 
     auto&& provider = Zig::SourceProvider::create(globalObject, res->result.value);
@@ -896,12 +860,12 @@ static JSValue fetchESMSourceCode(
     }
 
     if constexpr (allowPromise) {
-        auto* pendingCtx = Bun__transpileFile(bunVM, globalObject, specifier, referrer, typeAttribute, res, true, false);
+        auto* pendingCtx = Bun__transpileFile(bunVM, globalObject, specifier, referrer, typeAttribute, res, true);
         if (pendingCtx) {
             return pendingCtx;
         }
     } else {
-        Bun__transpileFile(bunVM, globalObject, specifier, referrer, typeAttribute, res, false, false);
+        Bun__transpileFile(bunVM, globalObject, specifier, referrer, typeAttribute, res, false);
     }
 
     if (res->success && res->result.value.isCommonJSModule) {
diff --git a/src/bun.js/bindings/ModuleLoader.h b/src/bun.js/bindings/ModuleLoader.h
index 4bcb48018a..6285d428a2 100644
--- a/src/bun.js/bindings/ModuleLoader.h
+++ b/src/bun.js/bindings/ModuleLoader.h
@@ -110,7 +110,7 @@ JSValue fetchCommonJSModule(
     Zig::GlobalObject* globalObject,
     JSCommonJSModule* moduleObject,
     JSValue specifierValue,
-    String specifier,
+    BunString* specifier,
     BunString* referrer,
     BunString* typeAttribute);
 
diff --git a/src/bun.js/bindings/NodeModuleModule.zig b/src/bun.js/bindings/NodeModuleModule.zig
index 1da4932984..b5f66759b1 100644
--- a/src/bun.js/bindings/NodeModuleModule.zig
+++ b/src/bun.js/bindings/NodeModuleModule.zig
@@ -81,154 +81,3 @@ pub fn _stat(path: []const u8) i32 {
         .directory => 1, // Returns 1 for directories.
     };
 }
-
-pub const CustomLoader = union(enum) {
-    loader: bun.options.Loader,
-    /// Retrieve via WriteBarrier in `global->lazyRequireExtensionsObject().get(index)`
-    custom: u32,
-
-    pub const Packed = enum(u32) {
-        const loader_start: u32 = std.math.maxInt(u32) - 4;
-        js = loader_start,
-        json = loader_start + 1,
-        napi = loader_start + 2,
-        ts = loader_start + 3,
-        /// custom
-        _,
-
-        pub fn pack(loader: CustomLoader) Packed {
-            return switch (loader) {
-                .loader => |basic| switch (basic) {
-                    .js => .js,
-                    .json => .json,
-                    .napi => .napi,
-                    .ts => .ts,
-                    else => brk: {
-                        bun.debugAssert(false);
-                        break :brk .js;
-                    },
-                },
-                .custom => |custom| @enumFromInt(custom),
-            };
-        }
-
-        pub fn unpack(self: Packed) CustomLoader {
-            return switch (self) {
-                .js => .{ .loader = .js },
-                .json => .{ .loader = .json },
-                .napi => .{ .loader = .napi },
-                .ts => .{ .loader = .ts },
-                _ => .{ .custom = @intFromEnum(self) },
-            };
-        }
-    };
-};
-
-extern fn JSCommonJSExtensions__appendFunction(global: *JSC.JSGlobalObject, value: JSC.JSValue) u32;
-extern fn JSCommonJSExtensions__setFunction(global: *JSC.JSGlobalObject, index: u32, value: JSC.JSValue) void;
-/// Returns the index of the last value, which must have it's references updated to `index`
-extern fn JSCommonJSExtensions__swapRemove(global: *JSC.JSGlobalObject, index: u32) u32;
-
-// Memory management is complicated because JSValues are stored in gc-visitable
-// WriteBarriers in C++ but the hash map for extensions is in Zig for flexibility.
-fn onRequireExtensionModify(global: *JSC.JSGlobalObject, str: []const u8, kind: i32, value: JSC.JSValue) !void {
-    bun.assert(kind >= -1 and kind <= 4);
-    const vm = global.bunVM();
-    const list = &vm.commonjs_custom_extensions;
-    defer vm.transpiler.resolver.opts.extra_cjs_extensions = list.keys();
-    const is_built_in = bun.options.defaultLoaders.get(str) != null;
-    if (kind >= 0) {
-        const loader: CustomLoader = switch (kind) {
-            1 => .{ .loader = .js },
-            2 => .{ .loader = .json },
-            3 => .{ .loader = .napi },
-            4 => .{ .loader = .ts },
-            else => .{ .custom = undefined }, // to be filled in later
-        };
-        const gop = try list.getOrPut(bun.default_allocator, str);
-        if (!gop.found_existing) {
-            const dupe = try bun.default_allocator.dupe(u8, str);
-            errdefer bun.default_allocator.free(dupe);
-            gop.key_ptr.* = dupe;
-            if (is_built_in) {
-                vm.has_mutated_built_in_extensions += 1;
-            }
-            gop.value_ptr.* = .pack(switch (loader) {
-                .loader => loader,
-                .custom => .{
-                    .custom = JSCommonJSExtensions__appendFunction(global, value),
-                },
-            });
-        } else {
-            const existing = gop.value_ptr.*.unpack();
-            if (existing == .custom and loader != .custom) {
-                swapRemoveExtension(vm, existing.custom);
-            }
-            gop.value_ptr.* = .pack(switch (loader) {
-                .loader => loader,
-                .custom => .{
-                    .custom = if (existing == .custom) new: {
-                        JSCommonJSExtensions__setFunction(global, existing.custom, value);
-                        break :new existing.custom;
-                    } else JSCommonJSExtensions__appendFunction(global, value),
-                },
-            });
-        }
-    } else if (list.fetchSwapRemove(str)) |prev| {
-        bun.default_allocator.free(prev.key);
-        if (is_built_in) {
-            vm.has_mutated_built_in_extensions -= 1;
-        }
-        switch (prev.value.unpack()) {
-            .loader => {},
-            .custom => |index| swapRemoveExtension(vm, index),
-        }
-    }
-}
-
-fn swapRemoveExtension(vm: *JSC.VirtualMachine, index: u32) void {
-    const last_index = JSCommonJSExtensions__swapRemove(vm.global, index);
-    if (last_index == index) return;
-    // Find and rewrite the last index to the new index.
-    // Since packed structs are sugar over the backing int, this code can use
-    // the simd path in the standard library search.
-    const find: u32 = @intFromEnum(CustomLoader.Packed.pack(.{ .custom = last_index }));
-    const values = vm.commonjs_custom_extensions.values();
-    const values_reinterpret = bun.reinterpretSlice(u32, values);
-    const i = std.mem.indexOfScalar(u32, values_reinterpret, find) orelse
-        return bun.debugAssert(false);
-    values[i] = .pack(.{ .custom = last_index });
-}
-
-pub fn findLongestRegisteredExtension(vm: *JSC.VirtualMachine, filename: []const u8) ?CustomLoader {
-    const basename = std.fs.path.basename(filename);
-    var next: usize = 0;
-    while (bun.strings.indexOfCharPos(basename, '.', next)) |i| {
-        next = i + 1;
-        if (i == 0) continue;
-        const ext = basename[i..];
-        if (vm.commonjs_custom_extensions.get(ext)) |value| {
-            return value.unpack();
-        }
-    }
-    return null;
-}
-
-fn onRequireExtensionModifyBinding(
-    global: *JSC.JSGlobalObject,
-    str: *const bun.String,
-    kind: i32,
-    value: JSC.JSValue,
-) callconv(.c) void {
-    var sfa_state = std.heap.stackFallback(8192, bun.default_allocator);
-    const alloc = sfa_state.get();
-    const str_slice = str.toUTF8(alloc);
-    defer str_slice.deinit();
-    onRequireExtensionModify(global, str_slice.slice(), kind, value) catch |err| switch (err) {
-        error.OutOfMemory => bun.outOfMemory(),
-    };
-}
-
-comptime {
-    @export(&onRequireExtensionModifyBinding, .{ .name = "NodeModuleModule__onRequireExtensionModify" });
-}
diff --git a/src/bun.js/bindings/ResolvedSource.zig b/src/bun.js/bindings/ResolvedSource.zig
index f8f43999e0..ed35ac3fc1 100644
--- a/src/bun.js/bindings/ResolvedSource.zig
+++ b/src/bun.js/bindings/ResolvedSource.zig
@@ -13,15 +13,13 @@ pub const ResolvedSource = extern struct {
 
     is_commonjs_module: bool = false,
 
-    /// When .tag is .common_js_custom_extension, this is special-cased to hold
-    /// the index of the extension, since the module is stored in a WriteBarrier.
-    cjs_custom_extension_index: u32 = 0,
+    hash: u32 = 0,
 
     allocator: ?*anyopaque = null,
 
     jsvalue_for_export: JSValue = .zero,
 
-    tag: Tag = .javascript,
+    tag: Tag = Tag.javascript,
 
     /// This is for source_code
     source_code_needs_deref: bool = true,
diff --git a/src/bun.js/bindings/ZigGlobalObject.cpp b/src/bun.js/bindings/ZigGlobalObject.cpp
index 3e2397f1d8..1df8ff2512 100644
--- a/src/bun.js/bindings/ZigGlobalObject.cpp
+++ b/src/bun.js/bindings/ZigGlobalObject.cpp
@@ -2938,6 +2938,18 @@ void GlobalObject::finishCreation(VM& vm)
             init.set(crypto);
         });
 
+    m_lazyRequireCacheObject.initLater(
+        [](const Initializer<JSObject>& init) {
+            JSC::VM& vm = init.vm;
+            JSC::JSGlobalObject* globalObject = init.owner;
+
+            auto* function = JSFunction::create(vm, globalObject, static_cast<JSC::FunctionExecutable*>(commonJSCreateRequireCacheCodeGenerator(vm)), globalObject);
+
+            NakedPtr<JSC::Exception> returnedException = nullptr;
+            auto result = JSC::profiledCall(globalObject, ProfilingReason::API, function, JSC::getCallData(function), globalObject, ArgList(), returnedException);
+            init.set(result.toObject(globalObject));
+        });
+
     m_lazyTestModuleObject.initLater(
         [](const Initializer<JSObject>& init) {
             JSC::JSGlobalObject* globalObject = init.owner;
diff --git a/src/bun.js/bindings/ZigGlobalObject.h b/src/bun.js/bindings/ZigGlobalObject.h
index af5aaf95fe..7fa6cf7da1 100644
--- a/src/bun.js/bindings/ZigGlobalObject.h
+++ b/src/bun.js/bindings/ZigGlobalObject.h
@@ -56,13 +56,6 @@ class GlobalInternals;
 #include <js_native_api.h>
 #include <node_api.h>
 
-namespace Bun {
-class JSCommonJSExtensions;
-class InternalModuleRegistry;
-class JSMockModule;
-class JSMockFunction;
-}
-
 namespace WebCore {
 class WorkerGlobalScope;
 class SubtleCrypto;
@@ -269,7 +262,6 @@ public:
     JSObject* processBindingFs() const { return m_processBindingFs.getInitializedOnMainThread(this); }
 
     JSObject* lazyRequireCacheObject() const { return m_lazyRequireCacheObject.getInitializedOnMainThread(this); }
-    Bun::JSCommonJSExtensions* lazyRequireExtensionsObject() const { return m_lazyRequireExtensionsObject.getInitializedOnMainThread(this); }
 
     Structure* NodeVMGlobalObjectStructure() const { return m_cachedNodeVMGlobalObjectStructure.getInitializedOnMainThread(this); }
     Structure* globalProxyStructure() const { return m_cachedGlobalProxyStructure.getInitializedOnMainThread(this); }
@@ -594,7 +586,6 @@ public:
     LazyProperty<JSGlobalObject, Structure> m_JSResizableOrGrowableSharedBufferSubclassStructure;
     LazyProperty<JSGlobalObject, JSWeakMap> m_vmModuleContextMap;
     LazyProperty<JSGlobalObject, JSObject> m_lazyRequireCacheObject;
-    LazyProperty<JSGlobalObject, Bun::JSCommonJSExtensions> m_lazyRequireExtensionsObject;
     LazyProperty<JSGlobalObject, JSObject> m_lazyTestModuleObject;
     LazyProperty<JSGlobalObject, JSObject> m_lazyPreloadTestModuleObject;
     LazyProperty<JSGlobalObject, JSObject> m_testMatcherUtilsObject;
diff --git a/src/bun.js/bindings/bindings.zig b/src/bun.js/bindings/bindings.zig
index 9633829240..a44efc4450 100644
--- a/src/bun.js/bindings/bindings.zig
+++ b/src/bun.js/bindings/bindings.zig
@@ -342,30 +342,30 @@ pub fn initialize(eval_mode: bool) void {
     JSCInitialize(
         std.os.environ.ptr,
         std.os.environ.len,
-        onJSCInvalidEnvVar,
+        struct {
+            pub fn callback(name: [*]const u8, len: usize) callconv(.C) void {
+                Output.prettyErrorln(
+                    \\<r><red>error<r><d>:<r> invalid JSC environment variable
+                    \\
+                    \\    <b>{s}<r>
+                    \\
+                    \\For a list of options, see this file:
+                    \\
+                    \\    https://github.com/oven-sh/webkit/blob/main/Source/JavaScriptCore/runtime/OptionsList.h
+                    \\
+                    \\Environment variables must be prefixed with "BUN_JSC_". This code runs before .env files are loaded, so those won't work here.
+                    \\
+                    \\Warning: options change between releases of Bun and WebKit without notice. This is not a stable API, you should not rely on it beyond debugging something, and it may be removed entirely in a future version of Bun.
+                ,
+                    .{name[0..len]},
+                );
+                bun.Global.exit(1);
+            }
+        }.callback,
         eval_mode,
     );
 }
 
-pub fn onJSCInvalidEnvVar(name: [*]const u8, len: usize) callconv(.C) void {
-    Output.prettyErrorln(
-        \\<r><red>error<r><d>:<r> invalid JSC environment variable
-        \\
-        \\    <b>{s}<r>
-        \\
-        \\For a list of options, see this file:
-        \\
-        \\    https://github.com/oven-sh/webkit/blob/main/Source/JavaScriptCore/runtime/OptionsList.h
-        \\
-        \\Environment variables must be prefixed with "BUN_JSC_". This code runs before .env files are loaded, so those won't work here.
-        \\
-        \\Warning: options change between releases of Bun and WebKit without notice. This is not a stable API, you should not rely on it beyond debugging something, and it may be removed entirely in a future version of Bun.
-    ,
-        .{name[0..len]},
-    );
-    bun.Global.exit(1);
-}
-
 /// Returns null on error. Use windows API to lookup the actual error.
 /// The reason this function is in zig is so that we can use our own utf16-conversion functions.
 ///
diff --git a/src/bun.js/bindings/headers-handwritten.h b/src/bun.js/bindings/headers-handwritten.h
index 3662a5452e..55710a0ebf 100644
--- a/src/bun.js/bindings/headers-handwritten.h
+++ b/src/bun.js/bindings/headers-handwritten.h
@@ -106,7 +106,7 @@ typedef struct ResolvedSource {
     BunString source_code;
     BunString source_url;
     bool isCommonJSModule;
-    uint32_t cjsCustomExtensionIndex;
+    uint32_t hash;
     void* allocator;
     JSC::EncodedJSValue jsvalue_for_export;
     uint32_t tag;
@@ -347,9 +347,7 @@ extern "C" JSC::JSInternalPromise* Bun__transpileFile(
     BunString* specifier,
     BunString* referrer,
     const BunString* typeAttribute,
-    ErrorableResolvedSource* result,
-    bool allowPromise,
-    bool isCommonJSRequire);
+    ErrorableResolvedSource* result, bool allowPromise);
 
 extern "C" bool Bun__fetchBuiltinModule(
     void* bunVM,
diff --git a/src/bun.js/bindings/webcore/DOMClientIsoSubspaces.h b/src/bun.js/bindings/webcore/DOMClientIsoSubspaces.h
index 159d2417cd..21a4ed1392 100644
--- a/src/bun.js/bindings/webcore/DOMClientIsoSubspaces.h
+++ b/src/bun.js/bindings/webcore/DOMClientIsoSubspaces.h
@@ -37,7 +37,6 @@ public:
     std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForBundlerPlugin;
     std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForNodeVMScript;
     std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForJSCommonJSModule;
-    std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForJSCommonJSExtensions;
     std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForJSMockImplementation;
     std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForJSModuleMock;
     std::unique_ptr<GCClient::IsoSubspace> m_clientSubspaceForJSMockFunction;
diff --git a/src/bun.js/bindings/webcore/DOMIsoSubspaces.h b/src/bun.js/bindings/webcore/DOMIsoSubspaces.h
index 6b64f5d0f3..ea657733a0 100644
--- a/src/bun.js/bindings/webcore/DOMIsoSubspaces.h
+++ b/src/bun.js/bindings/webcore/DOMIsoSubspaces.h
@@ -37,7 +37,6 @@ public:
     std::unique_ptr<IsoSubspace> m_subspaceForBundlerPlugin;
     std::unique_ptr<IsoSubspace> m_subspaceForNodeVMScript;
     std::unique_ptr<IsoSubspace> m_subspaceForJSCommonJSModule;
-    std::unique_ptr<IsoSubspace> m_subspaceForJSCommonJSExtensions;
     std::unique_ptr<IsoSubspace> m_subspaceForJSMockImplementation;
     std::unique_ptr<IsoSubspace> m_subspaceForJSModuleMock;
     std::unique_ptr<IsoSubspace> m_subspaceForJSMockFunction;
diff --git a/src/bun.js/javascript.zig b/src/bun.js/javascript.zig
index 7c4ea3f710..d72798803b 100644
--- a/src/bun.js/javascript.zig
+++ b/src/bun.js/javascript.zig
@@ -74,7 +74,6 @@ const PackageManager = @import("../install/install.zig").PackageManager;
 const IPC = @import("ipc.zig");
 const DNSResolver = @import("api/bun/dns_resolver.zig").DNSResolver;
 const Watcher = bun.Watcher;
-const node_module_module = @import("./bindings/NodeModuleModule.zig");
 
 const ModuleLoader = JSC.ModuleLoader;
 const FetchFlags = JSC.FetchFlags;
@@ -901,7 +900,7 @@ pub const VirtualMachine = struct {
 
     is_inside_deferred_task_queue: bool = false,
 
-    // defaults off. .on("message") will set it to true unless overridden
+    // defaults off. .on("message") will set it to true unles overridden
     // process.channel.unref() will set it to false and mark it overridden
     // on disconnect it will be disabled
     channel_ref: bun.Async.KeepAlive = .{},
@@ -910,18 +909,6 @@ pub const VirtualMachine = struct {
     // if one disconnect event listener should be ignored
     channel_ref_should_ignore_one_disconnect_event_listener: bool = false,
 
-    /// A set of extensions that exist in the require.extensions map. Keys
-    /// contain the leading '.'. Value is either a loader for built in
-    /// functions, or an index into JSCommonJSExtensions.
-    ///
-    /// `.keys() == transpiler.resolver.opts.extra_cjs_extensions`, so
-    /// mutations in this map must update the resolver.
-    commonjs_custom_extensions: bun.StringArrayHashMapUnmanaged(node_module_module.CustomLoader.Packed) = .empty,
-    /// Incremented when the `require.extensions` for a built-in extension is mutated.
-    /// An example is mutating `require.extensions['.js']` to intercept all '.js' files.
-    /// The value is decremented when defaults are restored.
-    has_mutated_built_in_extensions: u32 = 0,
-
     pub const OnUnhandledRejection = fn (*VirtualMachine, globalObject: *JSGlobalObject, JSValue) void;
 
     pub const OnException = fn (*ZigException) void;
@@ -2380,6 +2367,7 @@ pub const VirtualMachine = struct {
                 .source_code = bun.String.init(""),
                 .specifier = specifier,
                 .source_url = specifier.createIfDifferent(source_url),
+                .hash = 0,
                 .allocator = null,
                 .source_code_needs_deref = false,
             };
@@ -2394,6 +2382,7 @@ pub const VirtualMachine = struct {
             .source_code = bun.String.init(source.impl),
             .specifier = specifier,
             .source_url = specifier.createIfDifferent(source_url),
+            .hash = source.hash,
             .allocator = source,
             .source_code_needs_deref = false,
         };
diff --git a/src/bun.js/module_loader.zig b/src/bun.js/module_loader.zig
index 71360430ce..9ffcd0798a 100644
--- a/src/bun.js/module_loader.zig
+++ b/src/bun.js/module_loader.zig
@@ -42,7 +42,6 @@ const JSC = bun.JSC;
 const MarkedArrayBuffer = @import("./base.zig").MarkedArrayBuffer;
 const getAllocator = @import("./base.zig").getAllocator;
 const JSValue = bun.JSC.JSValue;
-const node_module_module = @import("./bindings/NodeModuleModule.zig");
 
 const JSGlobalObject = bun.JSC.JSGlobalObject;
 const ExceptionValueRef = bun.JSC.ExceptionValueRef;
@@ -79,6 +78,7 @@ inline fn jsSyntheticModule(name: ResolvedSource.Tag, specifier: String) Resolve
         .source_code = bun.String.empty,
         .specifier = specifier,
         .source_url = bun.String.static(@tagName(name)),
+        .hash = 0,
         .tag = name,
         .source_code_needs_deref = false,
     };
@@ -568,6 +568,7 @@ pub const RuntimeTranspilerStore = struct {
                             break :brk result;
                         },
                     },
+                    .hash = 0,
                     .is_commonjs_module = entry.metadata.module_type == .cjs,
                     .tag = this.resolved_source.tag,
                 };
@@ -581,6 +582,7 @@ pub const RuntimeTranspilerStore = struct {
                     .allocator = null,
                     .source_code = bun.String.createLatin1(parse_result.source.contents),
                     .already_bundled = true,
+                    .hash = 0,
                     .bytecode_cache = if (bytecode_slice.len > 0) bytecode_slice.ptr else null,
                     .bytecode_cache_size = bytecode_slice.len,
                     .is_commonjs_module = parse_result.already_bundled.isCommonJS(),
@@ -682,6 +684,7 @@ pub const RuntimeTranspilerStore = struct {
                 .allocator = null,
                 .source_code = source_code,
                 .is_commonjs_module = parse_result.ast.has_commonjs_export_names or parse_result.ast.exports_kind == .cjs,
+                .hash = 0,
                 .tag = this.resolved_source.tag,
             };
         }
@@ -1444,6 +1447,8 @@ pub const ModuleLoader = struct {
                 .specifier = String.init(specifier),
                 .source_url = String.init(path.text),
                 .is_commonjs_module = parse_result.ast.has_commonjs_export_names or parse_result.ast.exports_kind == .cjs,
+
+                .hash = 0,
             };
         }
 
@@ -1504,6 +1509,7 @@ pub const ModuleLoader = struct {
                     .source_code = bun.String.empty,
                     .specifier = input_specifier,
                     .source_url = input_specifier.createIfDifferent(path.text),
+                    .hash = 0,
                 };
             }
         }
@@ -1735,6 +1741,8 @@ pub const ModuleLoader = struct {
                         .source_code = bun.String.createUTF8(parse_result.source.contents),
                         .specifier = input_specifier,
                         .source_url = input_specifier.createIfDifferent(path.text),
+
+                        .hash = 0,
                         .tag = ResolvedSource.Tag.json_for_object_loader,
                     };
                 }
@@ -1749,6 +1757,7 @@ pub const ModuleLoader = struct {
                         },
                         .specifier = input_specifier,
                         .source_url = input_specifier.createIfDifferent(path.text),
+                        .hash = 0,
                     };
                 }
 
@@ -1758,6 +1767,7 @@ pub const ModuleLoader = struct {
                             .allocator = null,
                             .specifier = input_specifier,
                             .source_url = input_specifier.createIfDifferent(path.text),
+                            .hash = 0,
                             .jsvalue_for_export = JSValue.createEmptyObject(jsc_vm.global, 0),
                             .tag = .exports_object,
                         };
@@ -1767,6 +1777,7 @@ pub const ModuleLoader = struct {
                         .allocator = null,
                         .specifier = input_specifier,
                         .source_url = input_specifier.createIfDifferent(path.text),
+                        .hash = 0,
                         .jsvalue_for_export = parse_result.ast.parts.@"[0]"().stmts[0].data.s_expr.value.toJS(allocator, globalObject orelse jsc_vm.global) catch |e| panic("Unexpected JS error: {s}", .{@errorName(e)}),
                         .tag = .exports_object,
                     };
@@ -1780,6 +1791,7 @@ pub const ModuleLoader = struct {
                         .specifier = input_specifier,
                         .source_url = input_specifier.createIfDifferent(path.text),
                         .already_bundled = true,
+                        .hash = 0,
                         .bytecode_cache = if (bytecode_slice.len > 0) bytecode_slice.ptr else null,
                         .bytecode_cache_size = bytecode_slice.len,
                         .is_commonjs_module = parse_result.already_bundled.isCommonJS(),
@@ -1798,6 +1810,7 @@ pub const ModuleLoader = struct {
                             .specifier = input_specifier,
                             .source_url = input_specifier.createIfDifferent(path.text),
                             .is_commonjs_module = true,
+                            .hash = 0,
                             .tag = .javascript,
                         };
                     }
@@ -1826,6 +1839,7 @@ pub const ModuleLoader = struct {
                         },
                         .specifier = input_specifier,
                         .source_url = input_specifier.createIfDifferent(path.text),
+                        .hash = 0,
                         .is_commonjs_module = entry.metadata.module_type == .cjs,
                         .tag = brk: {
                             if (entry.metadata.module_type == .cjs and parse_result.source.path.isFile()) {
@@ -1956,6 +1970,7 @@ pub const ModuleLoader = struct {
                     .specifier = input_specifier,
                     .source_url = input_specifier.createIfDifferent(path.text),
                     .is_commonjs_module = parse_result.ast.has_commonjs_export_names or parse_result.ast.exports_kind == .cjs,
+                    .hash = 0,
                     .tag = tag,
                 };
             },
@@ -1998,6 +2013,7 @@ pub const ModuleLoader = struct {
             //         .source_code = ZigString.init(jsc_vm.allocator.dupe(u8, parse_result.source.contents) catch unreachable),
             //         .specifier = ZigString.init(specifier),
             //         .source_url = input_specifier.createIfDifferent(path.text),
+            //         .hash = 0,
             //         .tag = ResolvedSource.Tag.wasm,
             //     };
             // },
@@ -2023,6 +2039,7 @@ pub const ModuleLoader = struct {
                         .specifier = input_specifier,
                         .source_url = input_specifier.createIfDifferent(path.text),
                         .tag = .esm,
+                        .hash = 0,
                     };
                 }
 
@@ -2082,6 +2099,7 @@ pub const ModuleLoader = struct {
                     .specifier = input_specifier,
                     .source_url = input_specifier.createIfDifferent(path.text),
                     .tag = .esm,
+                    .hash = 0,
                 };
             },
 
@@ -2092,6 +2110,7 @@ pub const ModuleLoader = struct {
                         .source_code = bun.String.empty,
                         .specifier = input_specifier,
                         .source_url = input_specifier.createIfDifferent(path.text),
+                        .hash = 0,
                         .tag = .esm,
                     };
                 }
@@ -2106,6 +2125,7 @@ pub const ModuleLoader = struct {
                     .jsvalue_for_export = html_bundle.toJS(globalObject.?),
                     .specifier = input_specifier,
                     .source_url = input_specifier.createIfDifferent(path.text),
+                    .hash = 0,
                     .tag = .export_default_object,
                 };
             },
@@ -2117,6 +2137,7 @@ pub const ModuleLoader = struct {
                         .source_code = bun.String.empty,
                         .specifier = input_specifier,
                         .source_url = input_specifier.createIfDifferent(path.text),
+                        .hash = 0,
                         .tag = .esm,
                     };
                 }
@@ -2188,6 +2209,7 @@ pub const ModuleLoader = struct {
                     .jsvalue_for_export = value,
                     .specifier = input_specifier,
                     .source_url = input_specifier.createIfDifferent(path.text),
+                    .hash = 0,
                     .tag = .export_default_object,
                 };
             },
@@ -2255,7 +2277,6 @@ pub const ModuleLoader = struct {
         type_attribute: ?*const bun.String,
         ret: *JSC.ErrorableResolvedSource,
         allow_promise: bool,
-        is_commonjs_require: bool,
     ) ?*anyopaque {
         JSC.markBinding(@src());
         var log = logger.Log.init(jsc_vm.transpiler.allocator);
@@ -2273,63 +2294,13 @@ pub const ModuleLoader = struct {
 
         var virtual_source_to_use: ?logger.Source = null;
         var blob_to_deinit: ?JSC.WebCore.Blob = null;
-        var lr = options.getLoaderAndVirtualSource(_specifier.slice(), jsc_vm, &virtual_source_to_use, &blob_to_deinit, type_attribute_str) catch {
+        const lr = options.getLoaderAndVirtualSource(_specifier.slice(), jsc_vm, &virtual_source_to_use, &blob_to_deinit, type_attribute_str) catch {
             ret.* = JSC.ErrorableResolvedSource.err(error.JSErrorObject, globalObject.MODULE_NOT_FOUND("Blob not found", .{}).toJS().asVoid());
             return null;
         };
         defer if (blob_to_deinit) |*blob| blob.deinit();
 
-        if (is_commonjs_require and jsc_vm.has_mutated_built_in_extensions > 0) brk: {
-            @branchHint(.unlikely);
-            if (node_module_module.findLongestRegisteredExtension(jsc_vm, _specifier.slice())) |entry| {
-                switch (entry) {
-                    .loader => |loader| {
-                        lr.loader = loader;
-                        break :brk;
-                    },
-                    .custom => |index| {
-                        ret.* = JSC.ErrorableResolvedSource.ok(ResolvedSource{
-                            .allocator = null,
-                            .source_code = bun.String.empty,
-                            .specifier = .empty,
-                            .source_url = .empty,
-                            .cjs_custom_extension_index = index,
-                            .tag = .common_js_custom_extension,
-                        });
-                        return null;
-                    },
-                }
-            }
-        }
-
-        const module_type: options.ModuleType = brk: {
-            const ext = lr.path.name.ext;
-            // regular expression /.[cm][jt]s$/
-            if (ext.len == ".cjs".len) {
-                if (strings.eqlComptimeIgnoreLen(ext, ".cjs"))
-                    break :brk .cjs;
-                if (strings.eqlComptimeIgnoreLen(ext, ".mjs"))
-                    break :brk .esm;
-                if (strings.eqlComptimeIgnoreLen(ext, ".cts"))
-                    break :brk .cjs;
-                if (strings.eqlComptimeIgnoreLen(ext, ".mts"))
-                    break :brk .esm;
-            }
-            // regular expression /.[jt]s$/
-            if (ext.len == ".ts".len) {
-                if (strings.eqlComptimeIgnoreLen(ext, ".js") or
-                    strings.eqlComptimeIgnoreLen(ext, ".ts"))
-                {
-                    // Use the package.json module type if it exists
-                    break :brk if (lr.package_json) |pkg|
-                        pkg.module_type
-                    else
-                        .unknown;
-                }
-            }
-            // For JSX TSX and other extensions, let the file contents.
-            break :brk .unknown;
-        };
+        const module_type: options.ModuleType = if (lr.package_json) |pkg| pkg.module_type else .unknown;
         const pkg_name: ?[]const u8 = if (lr.package_json) |pkg|
             if (pkg.name.len > 0) pkg.name else null
         else
@@ -2396,48 +2367,19 @@ pub const ModuleLoader = struct {
             }
         }
 
-        const synchronous_loader: options.Loader = lr.loader orelse loader: {
+        const synchronous_loader = lr.loader orelse loader: {
             if (jsc_vm.has_loaded or jsc_vm.is_in_preload) {
                 // Extensionless files in this context are treated as the JS loader
                 if (lr.path.name.ext.len == 0) {
-                    break :loader .tsx;
+                    break :loader options.Loader.tsx;
                 }
 
                 // Unknown extensions are to be treated as file loader
-                if (is_commonjs_require) {
-                    if (jsc_vm.commonjs_custom_extensions.entries.len > 0 and
-                        jsc_vm.has_mutated_built_in_extensions == 0)
-                    {
-                        @branchHint(.unlikely);
-                        if (node_module_module.findLongestRegisteredExtension(jsc_vm, lr.path.text)) |entry| {
-                            switch (entry) {
-                                .loader => |loader| break :loader loader,
-                                .custom => |index| {
-                                    ret.* = JSC.ErrorableResolvedSource.ok(ResolvedSource{
-                                        .allocator = null,
-                                        .source_code = bun.String.empty,
-                                        .specifier = .empty,
-                                        .source_url = .empty,
-                                        .cjs_custom_extension_index = index,
-                                        .tag = .common_js_custom_extension,
-                                    });
-                                    return null;
-                                },
-                            }
-                        }
-                    }
-
-                    // For Node.js compatibility, requiring a file with an
-                    // unknown extension will be treated as a JS file
-                    break :loader .ts;
-                }
-
-                // For ESM, Bun treats unknown extensions as file loader
-                break :loader .file;
+                break :loader options.Loader.file;
             } else {
                 // Unless it's potentially the main module
                 // This is important so that "bun run ./foo-i-have-no-extension" works
-                break :loader .tsx;
+                break :loader options.Loader.tsx;
             }
         };
 
@@ -2509,6 +2451,7 @@ pub const ModuleLoader = struct {
                 .source_code = bun.String.createUTF8(jsc_vm.entry_point.source.contents),
                 .specifier = specifier,
                 .source_url = specifier,
+                .hash = 0,
                 .tag = .esm,
                 .source_code_needs_deref = true,
             },
@@ -2524,6 +2467,7 @@ pub const ModuleLoader = struct {
                 .source_code = String.init(Runtime.Runtime.sourceCode()),
                 .specifier = specifier,
                 .source_url = specifier,
+                .hash = Runtime.Runtime.versionHash(),
             },
             inline else => |tag| jsSyntheticModule(@field(ResolvedSource.Tag, @tagName(tag)), specifier),
         };
@@ -2543,6 +2487,7 @@ pub const ModuleLoader = struct {
                     .source_code = bun.String.createUTF8(entry.source.contents),
                     .specifier = specifier,
                     .source_url = specifier.dupeRef(),
+                    .hash = 0,
                 };
             }
         } else if (jsc_vm.standalone_module_graph) |graph| {
@@ -2564,6 +2509,7 @@ pub const ModuleLoader = struct {
                         .source_code = bun.String.static(code),
                         .specifier = specifier,
                         .source_url = specifier.dupeRef(),
+                        .hash = 0,
                         .source_code_needs_deref = false,
                     };
                 }
@@ -2573,6 +2519,7 @@ pub const ModuleLoader = struct {
                     .source_code = file.toWTFString(),
                     .specifier = specifier,
                     .source_url = specifier.dupeRef(),
+                    .hash = 0,
                     .source_code_needs_deref = false,
                     .bytecode_cache = if (file.bytecode.len > 0) file.bytecode.ptr else null,
                     .bytecode_cache_size = file.bytecode.len,
diff --git a/src/bun.js/modules/NodeModuleModule.cpp b/src/bun.js/modules/NodeModuleModule.cpp
index f25ce59988..e14600539a 100644
--- a/src/bun.js/modules/NodeModuleModule.cpp
+++ b/src/bun.js/modules/NodeModuleModule.cpp
@@ -12,7 +12,6 @@
 #include <JavaScriptCore/JSInternalPromise.h>
 #include "JavaScriptCore/Completion.h"
 #include "JavaScriptCore/JSNativeStdFunction.h"
-#include "JSCommonJSExtensions.h"
 
 #include "PathInlines.h"
 #include "ZigGlobalObject.h"
@@ -563,12 +562,6 @@ static JSValue getModuleCacheObject(VM& vm, JSObject* moduleObject)
         ->lazyRequireCacheObject();
 }
 
-static JSValue getModuleExtensionsObject(VM& vm, JSObject* moduleObject)
-{
-    return jsCast<Zig::GlobalObject*>(moduleObject->globalObject())
-        ->lazyRequireExtensionsObject();
-}
-
 static JSValue getModuleDebugObject(VM& vm, JSObject* moduleObject)
 {
     return JSC::constructEmptyObject(moduleObject->globalObject());
@@ -581,6 +574,13 @@ static JSValue getPathCacheObject(VM& vm, JSObject* moduleObject)
         vm, globalObject->nullPrototypeObjectStructure());
 }
 
+static JSValue getModuleExtensionsObject(VM& vm, JSObject* moduleObject)
+{
+    auto* globalObject = defaultGlobalObject(moduleObject->globalObject());
+    return globalObject->requireFunctionUnbound()->getIfPropertyExists(
+        globalObject, Identifier::fromString(vm, "extensions"_s));
+}
+
 static JSValue getSourceMapFunction(VM& vm, JSObject* moduleObject)
 {
     auto* globalObject = defaultGlobalObject(moduleObject->globalObject());
@@ -951,27 +951,6 @@ void addNodeModuleConstructorProperties(JSC::VM& vm,
                 JSC::NoIntrinsic, jsFunctionResolveFileName);
             init.set(resolveFilenameFunction);
         });
-
-    globalObject->m_lazyRequireCacheObject.initLater(
-        [](const Zig::GlobalObject::Initializer<JSObject>& init) {
-            JSC::VM& vm = init.vm;
-            JSC::JSGlobalObject* globalObject = init.owner;
-
-            auto* function = JSFunction::create(vm, globalObject, static_cast<JSC::FunctionExecutable*>(commonJSCreateRequireCacheCodeGenerator(vm)), globalObject);
-
-            NakedPtr<JSC::Exception> returnedException = nullptr;
-            auto result = JSC::profiledCall(globalObject, ProfilingReason::API, function, JSC::getCallData(function), globalObject, ArgList(), returnedException);
-            ASSERT(!returnedException);
-            init.set(result.toObject(globalObject));
-        });
-
-    globalObject->m_lazyRequireExtensionsObject.initLater(
-        [](const Zig::GlobalObject::Initializer<Bun::JSCommonJSExtensions>& init) {
-            JSC::VM& vm = init.vm;
-            JSC::JSGlobalObject* globalObject = init.owner;
-
-            init.set(JSCommonJSExtensions::create(vm, globalObject, JSCommonJSExtensions::createStructure(vm, globalObject, globalObject->nullPrototype())));
-        });
 }
 
 JSC_DEFINE_HOST_FUNCTION(jsFunctionIsModuleResolveFilenameSlowPathEnabled,
diff --git a/src/codegen/bundle-modules.ts b/src/codegen/bundle-modules.ts
index 4e954e76bd..44db6f130c 100644
--- a/src/codegen/bundle-modules.ts
+++ b/src/codegen/bundle-modules.ts
@@ -395,6 +395,7 @@ writeIfNotChanged(
   path.join(CODEGEN_DIR, "ResolvedSourceTag.zig"),
   `// zig fmt: off
 pub const ResolvedSourceTag = enum(u32) {
+    // Predefined
     javascript = 0,
     package_json_type_module = 1,
     package_json_type_commonjs = 2,
@@ -403,12 +404,11 @@ pub const ResolvedSourceTag = enum(u32) {
     file = 5,
     esm = 6,
     json_for_object_loader = 7,
-    /// Generate an object with "default" set to all the exports, including a "default" property
+    /// Generate an object with "default" set to all the exports, including a "default" propert
     exports_object = 8,
+
     /// Generate a module that only exports default the input JSValue
     export_default_object = 9,
-    /// Signal upwards that the matching value in 'require.extensions' should be used.
-    common_js_custom_extension = 10,
 
     // Built in modules are loaded through InternalModuleRegistry by numerical ID.
     // In this enum are represented as \`(1 << 9) & id\`
@@ -438,7 +438,6 @@ writeIfNotChanged(
     JSONForObjectLoader = 7,
     ExportsObject = 8,
     ExportDefaultObject = 9,
-    CommonJSCustomExtension = 10,
     // Built in modules are loaded through InternalModuleRegistry by numerical ID.
     // In this enum are represented as \`(1 << 9) & id\`
     InternalModuleRegistryFlag = 1 << 9,
diff --git a/src/js/builtins.d.ts b/src/js/builtins.d.ts
index d3a34cffec..f6ae715204 100644
--- a/src/js/builtins.d.ts
+++ b/src/js/builtins.d.ts
@@ -484,7 +484,7 @@ declare function $createCommonJSModule(
   id: string,
   exports: any,
   hasEvaluated: boolean,
-  parent: JSCommonJSModule | undefined,
+  parent: ?JSCommonJSModule,
 ): JSCommonJSModule;
 declare function $evaluateCommonJSModule(
   moduleToEvaluate: JSCommonJSModule,
diff --git a/src/js_parser.zig b/src/js_parser.zig
index 93ffd6fdca..081e6ae040 100644
--- a/src/js_parser.zig
+++ b/src/js_parser.zig
@@ -3590,6 +3590,9 @@ pub const Parser = struct {
             }
         }
 
+        const did_import_fast_refresh = false;
+        _ = did_import_fast_refresh;
+
         // This is a workaround for broken module environment checks in packages like lodash-es
         // https://github.com/lodash/lodash/issues/5660
         var force_esm = false;
@@ -3961,13 +3964,7 @@ pub const Parser = struct {
             switch (p.options.module_type) {
                 // ".cjs" or ".cts" or ("type: commonjs" and (".js" or ".jsx" or ".ts" or ".tsx"))
                 .cjs => {
-                    // There are no commonjs-only features used (require is allowed in ESM)
-                    bun.assert(!uses_exports_ref and
-                        !uses_module_ref and
-                        !p.has_top_level_return and
-                        !p.has_with_scope);
-                    // Use ESM if the file has ES module syntax (import)
-                    exports_kind = if (p.has_es_module_syntax) .esm else .cjs;
+                    exports_kind = .cjs;
                 },
                 .esm => {
                     exports_kind = .esm;
diff --git a/src/options.zig b/src/options.zig
index f6ceb6c525..982b128bb7 100644
--- a/src/options.zig
+++ b/src/options.zig
@@ -80,9 +80,9 @@ pub fn stringHashMapFromArrays(comptime t: type, allocator: std.mem.Allocator, k
 }
 
 pub const ExternalModules = struct {
-    node_modules: std.BufSet,
-    abs_paths: std.BufSet,
-    patterns: []const WildcardPattern,
+    node_modules: std.BufSet = undefined,
+    abs_paths: std.BufSet = undefined,
+    patterns: []const WildcardPattern = undefined,
 
     pub const WildcardPattern = struct {
         prefix: string,
@@ -1700,7 +1700,7 @@ pub const BundleOptions = struct {
     main_fields: []const string = Target.DefaultMainFields.get(Target.browser),
     /// TODO: remove this in favor accessing bundler.log
     log: *logger.Log,
-    external: ExternalModules,
+    external: ExternalModules = ExternalModules{},
     entry_points: []const string,
     entry_naming: []const u8 = "",
     asset_naming: []const u8 = "",
@@ -1708,9 +1708,6 @@ pub const BundleOptions = struct {
     public_path: []const u8 = "",
     extension_order: ResolveFileExtensions = .{},
     main_field_extension_order: []const string = &Defaults.MainFieldExtensionOrder,
-    /// This list applies to all extension resolution cases. The runtime uses
-    /// this for implementing `require.extensions`
-    extra_cjs_extensions: []const []const u8 = &.{},
     out_extensions: bun.StringHashMap(string),
     import_path_format: ImportPathFormat = ImportPathFormat.relative,
     defines_loaded: bool = false,
diff --git a/src/resolver/package_json.zig b/src/resolver/package_json.zig
index 7095b69572..7e86224048 100644
--- a/src/resolver/package_json.zig
+++ b/src/resolver/package_json.zig
@@ -604,7 +604,7 @@ pub const PackageJSON = struct {
             null,
         ) catch |err| {
             if (err != error.IsDir) {
-                r.log.addErrorFmt(null, logger.Loc.Empty, allocator, "Cannot read file \"{s}\": {s}", .{ input_path, @errorName(err) }) catch unreachable;
+                r.log.addErrorFmt(null, logger.Loc.Empty, allocator, "Cannot read file \"{s}\": {s}", .{ r.prettyPath(fs.Path.init(input_path)), @errorName(err) }) catch unreachable;
             }
 
             return null;
@@ -618,7 +618,7 @@ pub const PackageJSON = struct {
         const key_path = fs.Path.init(package_json_path);
 
         var json_source = logger.Source.initPathString(key_path.text, entry.contents);
-        json_source.path.pretty = json_source.path.text;
+        json_source.path.pretty = r.prettyPath(json_source.path);
 
         const json: js_ast.Expr = (r.caches.json.parsePackageJSON(r.log, json_source, allocator, true) catch |err| {
             if (Environment.isDebug) {
diff --git a/src/resolver/resolver.zig b/src/resolver/resolver.zig
index c46514b3db..d8e01b1896 100644
--- a/src/resolver/resolver.zig
+++ b/src/resolver/resolver.zig
@@ -2565,6 +2565,11 @@ pub const Resolver = struct {
         return result;
     }
 
+    // TODO:
+    pub fn prettyPath(_: *ThisResolver, path: Path) string {
+        return path.text;
+    }
+
     pub fn binDirs(_: *const ThisResolver) []const string {
         if (!bin_folders_loaded) return &[_]string{};
         return bin_folders.constSlice();
@@ -2828,7 +2833,7 @@ pub const Resolver = struct {
                         r.dir_cache.markNotFound(queue_top.result);
                         rfs.entries.markNotFound(cached_dir_entry_result);
                         if (comptime enable_logging) {
-                            const pretty = queue_top.unsafe_path;
+                            const pretty = r.prettyPath(Path.init(queue_top.unsafe_path));
 
                             r.log.addErrorFmt(
                                 null,
@@ -3466,68 +3471,54 @@ pub const Resolver = struct {
     }
 
     pub fn loadAsIndex(r: *ThisResolver, dir_info: *DirInfo, extension_order: []const string) ?MatchResult {
+        const rfs = &r.fs.fs;
         // Try the "index" file with extensions
         for (extension_order) |ext| {
-            if (loadIndexWithExtension(r, dir_info, ext)) |result| {
-                return result;
-            }
-        }
-        for (r.opts.extra_cjs_extensions) |ext| {
-            if (loadIndexWithExtension(r, dir_info, ext)) |result| {
-                return result;
-            }
-        }
+            var ext_buf = bufs(.extension_path);
 
-        return null;
-    }
+            var base = ext_buf[0 .. "index".len + ext.len];
+            base[0.."index".len].* = "index".*;
+            bun.copy(u8, base["index".len..], ext);
 
-    fn loadIndexWithExtension(r: *ThisResolver, dir_info: *DirInfo, ext: string) ?MatchResult {
-        const rfs = &r.fs.fs;
+            if (dir_info.getEntries(r.generation)) |entries| {
+                if (entries.get(base)) |lookup| {
+                    if (lookup.entry.kind(rfs, r.store_fd) == .file) {
+                        const out_buf = brk: {
+                            if (lookup.entry.abs_path.isEmpty()) {
+                                const parts = [_]string{ dir_info.abs_path, base };
+                                const out_buf_ = r.fs.absBuf(&parts, bufs(.index));
+                                lookup.entry.abs_path =
+                                    PathString.init(r.fs.dirname_store.append(@TypeOf(out_buf_), out_buf_) catch unreachable);
+                            }
+                            break :brk lookup.entry.abs_path.slice();
+                        };
 
-        var ext_buf = bufs(.extension_path);
-
-        var base = ext_buf[0 .. "index".len + ext.len];
-        base[0.."index".len].* = "index".*;
-        bun.copy(u8, base["index".len..], ext);
-
-        if (dir_info.getEntries(r.generation)) |entries| {
-            if (entries.get(base)) |lookup| {
-                if (lookup.entry.kind(rfs, r.store_fd) == .file) {
-                    const out_buf = brk: {
-                        if (lookup.entry.abs_path.isEmpty()) {
-                            const parts = [_]string{ dir_info.abs_path, base };
-                            const out_buf_ = r.fs.absBuf(&parts, bufs(.index));
-                            lookup.entry.abs_path =
-                                PathString.init(r.fs.dirname_store.append(@TypeOf(out_buf_), out_buf_) catch unreachable);
+                        if (r.debug_logs) |*debug| {
+                            debug.addNoteFmt("Found file: \"{s}\"", .{out_buf});
                         }
-                        break :brk lookup.entry.abs_path.slice();
-                    };
 
-                    if (r.debug_logs) |*debug| {
-                        debug.addNoteFmt("Found file: \"{s}\"", .{out_buf});
-                    }
+                        if (dir_info.package_json) |package_json| {
+                            return MatchResult{
+                                .path_pair = .{ .primary = Path.init(out_buf) },
+                                .diff_case = lookup.diff_case,
+                                .package_json = package_json,
+                                .dirname_fd = dir_info.getFileDescriptor(),
+                            };
+                        }
 
-                    if (dir_info.package_json) |package_json| {
                         return MatchResult{
                             .path_pair = .{ .primary = Path.init(out_buf) },
                             .diff_case = lookup.diff_case,
-                            .package_json = package_json,
+
                             .dirname_fd = dir_info.getFileDescriptor(),
                         };
                     }
-
-                    return MatchResult{
-                        .path_pair = .{ .primary = Path.init(out_buf) },
-                        .diff_case = lookup.diff_case,
-
-                        .dirname_fd = dir_info.getFileDescriptor(),
-                    };
                 }
             }
-        }
 
-        if (r.debug_logs) |*debug| {
-            debug.addNoteFmt("Failed to find file: \"{s}/{s}\"", .{ dir_info.abs_path, base });
+            if (r.debug_logs) |*debug| {
+                debug.addNoteFmt("Failed to find file: \"{s}/{s}\"", .{ dir_info.abs_path, base });
+            }
         }
 
         return null;
@@ -3751,7 +3742,7 @@ pub const Resolver = struct {
     }
 
     pub fn loadAsFile(r: *ThisResolver, path: string, extension_order: []const string) ?LoadResult {
-        const rfs: *Fs.FileSystem.RealFS = &r.fs.fs;
+        var rfs: *Fs.FileSystem.RealFS = &r.fs.fs;
 
         if (r.debug_logs) |*debug| {
             debug.addNoteFmt("Attempting to load \"{s}\" as a file", .{path});
@@ -3783,7 +3774,7 @@ pub const Resolver = struct {
                     r.allocator,
                     "Cannot read directory \"{s}\": {s}",
                     .{
-                        dir_path,
+                        r.prettyPath(Path.init(dir_path)),
                         @errorName(dir_entry.err.original_err),
                     },
                 ) catch {};
@@ -3827,14 +3818,35 @@ pub const Resolver = struct {
         // Try the path with extensions
         bun.copy(u8, bufs(.load_as_file), path);
         for (extension_order) |ext| {
-            if (loadExtension(r, base, path, ext, entries)) |result| {
-                return result;
-            }
-        }
+            var buffer = bufs(.load_as_file)[0 .. path.len + ext.len];
+            bun.copy(u8, buffer[path.len..], ext);
+            const file_name = buffer[path.len - base.len .. buffer.len];
 
-        for (r.opts.extra_cjs_extensions) |ext| {
-            if (loadExtension(r, base, path, ext, entries)) |result| {
-                return result;
+            if (r.debug_logs) |*debug| {
+                debug.addNoteFmt("Checking for file \"{s}\" ", .{buffer});
+            }
+
+            if (entries.get(file_name)) |query| {
+                if (query.entry.kind(rfs, r.store_fd) == .file) {
+                    if (r.debug_logs) |*debug| {
+                        debug.addNoteFmt("Found file \"{s}\" ", .{buffer});
+                    }
+
+                    // now that we've found it, we allocate it.
+                    return LoadResult{
+                        .path = brk: {
+                            query.entry.abs_path = if (query.entry.abs_path.isEmpty())
+                                PathString.init(r.fs.dirname_store.append(@TypeOf(buffer), buffer) catch unreachable)
+                            else
+                                query.entry.abs_path;
+
+                            break :brk query.entry.abs_path.slice();
+                        },
+                        .diff_case = query.diff_case,
+                        .dirname_fd = entries.fd,
+                        .file_fd = query.entry.cache.fd,
+                    };
+                }
             }
         }
 
@@ -3919,42 +3931,6 @@ pub const Resolver = struct {
         return null;
     }
 
-    fn loadExtension(r: *ThisResolver, base: string, path: string, ext: string, entries: *Fs.FileSystem.DirEntry) ?LoadResult {
-        const rfs: *Fs.FileSystem.RealFS = &r.fs.fs;
-        const buffer = bufs(.load_as_file)[0 .. path.len + ext.len];
-        bun.copy(u8, buffer[path.len..], ext);
-        const file_name = buffer[path.len - base.len .. buffer.len];
-
-        if (r.debug_logs) |*debug| {
-            debug.addNoteFmt("Checking for file \"{s}\" ", .{buffer});
-        }
-
-        if (entries.get(file_name)) |query| {
-            if (query.entry.kind(rfs, r.store_fd) == .file) {
-                if (r.debug_logs) |*debug| {
-                    debug.addNoteFmt("Found file \"{s}\" ", .{buffer});
-                }
-
-                // now that we've found it, we allocate it.
-                return .{
-                    .path = brk: {
-                        query.entry.abs_path = if (query.entry.abs_path.isEmpty())
-                            PathString.init(r.fs.dirname_store.append(@TypeOf(buffer), buffer) catch unreachable)
-                        else
-                            query.entry.abs_path;
-
-                        break :brk query.entry.abs_path.slice();
-                    },
-                    .diff_case = query.diff_case,
-                    .dirname_fd = entries.fd,
-                    .file_fd = query.entry.cache.fd,
-                };
-            }
-        }
-
-        return null;
-    }
-
     fn dirInfoUncached(
         r: *ThisResolver,
         info: *DirInfo,
@@ -4162,7 +4138,8 @@ pub const Resolver = struct {
                     tsconfigpath,
                     if (FeatureFlags.store_file_descriptors) fd else .zero,
                 ) catch |err| brk: {
-                    const pretty = tsconfigpath;
+                    const pretty = r.prettyPath(Path.init(tsconfigpath));
+
                     if (err == error.ENOENT or err == error.FileNotFound) {
                         r.log.addErrorFmt(null, logger.Loc.Empty, r.allocator, "Cannot find tsconfig file {}", .{bun.fmt.QuotedFormatter{ .text = pretty }}) catch {};
                     } else if (err != error.ParseErrorAlreadyLogged and err != error.IsDir and err != error.EISDIR) {
diff --git a/src/transpiler.zig b/src/transpiler.zig
index 8d821df180..60470cfdf7 100644
--- a/src/transpiler.zig
+++ b/src/transpiler.zig
@@ -1177,21 +1177,21 @@ pub const Transpiler = struct {
                     transpiler.log,
                     &source,
                 ) catch null) orelse return null) {
-                    .ast => |value| .{
+                    .ast => |value| ParseResult{
                         .ast = value,
                         .source = source,
                         .loader = loader,
                         .input_fd = input_fd,
                         .runtime_transpiler_cache = this_parse.runtime_transpiler_cache,
                     },
-                    .cached => .{
+                    .cached => ParseResult{
                         .ast = undefined,
                         .runtime_transpiler_cache = this_parse.runtime_transpiler_cache,
                         .source = source,
                         .loader = loader,
                         .input_fd = input_fd,
                     },
-                    .already_bundled => |already_bundled| .{
+                    .already_bundled => |already_bundled| ParseResult{
                         .ast = undefined,
                         .already_bundled = switch (already_bundled) {
                             .bun => .source_code,
diff --git a/test/cli/run/module-type-fixture/cjs/hello.cjs b/test/cli/run/module-type-fixture/cjs/hello.cjs
deleted file mode 100644
index 248453e484..0000000000
--- a/test/cli/run/module-type-fixture/cjs/hello.cjs
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
diff --git a/test/cli/run/module-type-fixture/cjs/hello.cts b/test/cli/run/module-type-fixture/cjs/hello.cts
deleted file mode 100644
index 248453e484..0000000000
--- a/test/cli/run/module-type-fixture/cjs/hello.cts
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
diff --git a/test/cli/run/module-type-fixture/cjs/hello.js b/test/cli/run/module-type-fixture/cjs/hello.js
deleted file mode 100644
index 72c037e9a6..0000000000
--- a/test/cli/run/module-type-fixture/cjs/hello.js
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
\ No newline at end of file
diff --git a/test/cli/run/module-type-fixture/cjs/hello.jsx b/test/cli/run/module-type-fixture/cjs/hello.jsx
deleted file mode 100644
index 72c037e9a6..0000000000
--- a/test/cli/run/module-type-fixture/cjs/hello.jsx
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
\ No newline at end of file
diff --git a/test/cli/run/module-type-fixture/cjs/hello.mjs b/test/cli/run/module-type-fixture/cjs/hello.mjs
deleted file mode 100644
index 248453e484..0000000000
--- a/test/cli/run/module-type-fixture/cjs/hello.mjs
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
diff --git a/test/cli/run/module-type-fixture/cjs/hello.mts b/test/cli/run/module-type-fixture/cjs/hello.mts
deleted file mode 100644
index 248453e484..0000000000
--- a/test/cli/run/module-type-fixture/cjs/hello.mts
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
diff --git a/test/cli/run/module-type-fixture/cjs/hello.ts b/test/cli/run/module-type-fixture/cjs/hello.ts
deleted file mode 100644
index 72c037e9a6..0000000000
--- a/test/cli/run/module-type-fixture/cjs/hello.ts
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
\ No newline at end of file
diff --git a/test/cli/run/module-type-fixture/cjs/hello.tsx b/test/cli/run/module-type-fixture/cjs/hello.tsx
deleted file mode 100644
index 72c037e9a6..0000000000
--- a/test/cli/run/module-type-fixture/cjs/hello.tsx
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
\ No newline at end of file
diff --git a/test/cli/run/module-type-fixture/cjs/import.cjs b/test/cli/run/module-type-fixture/cjs/import.cjs
deleted file mode 100644
index 08c3035d60..0000000000
--- a/test/cli/run/module-type-fixture/cjs/import.cjs
+++ /dev/null
@@ -1,3 +0,0 @@
-import * as fs from "node:fs";
-console.log(eval("typeof module === 'undefined'"));
-+fs;
diff --git a/test/cli/run/module-type-fixture/cjs/package.json b/test/cli/run/module-type-fixture/cjs/package.json
deleted file mode 100644
index 5bbefffbab..0000000000
--- a/test/cli/run/module-type-fixture/cjs/package.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "type": "commonjs"
-}
diff --git a/test/cli/run/module-type-fixture/esm/hello.cjs b/test/cli/run/module-type-fixture/esm/hello.cjs
deleted file mode 100644
index 248453e484..0000000000
--- a/test/cli/run/module-type-fixture/esm/hello.cjs
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
diff --git a/test/cli/run/module-type-fixture/esm/hello.cts b/test/cli/run/module-type-fixture/esm/hello.cts
deleted file mode 100644
index 248453e484..0000000000
--- a/test/cli/run/module-type-fixture/esm/hello.cts
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
diff --git a/test/cli/run/module-type-fixture/esm/hello.js b/test/cli/run/module-type-fixture/esm/hello.js
deleted file mode 100644
index 72c037e9a6..0000000000
--- a/test/cli/run/module-type-fixture/esm/hello.js
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
\ No newline at end of file
diff --git a/test/cli/run/module-type-fixture/esm/hello.jsx b/test/cli/run/module-type-fixture/esm/hello.jsx
deleted file mode 100644
index 72c037e9a6..0000000000
--- a/test/cli/run/module-type-fixture/esm/hello.jsx
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
\ No newline at end of file
diff --git a/test/cli/run/module-type-fixture/esm/hello.mjs b/test/cli/run/module-type-fixture/esm/hello.mjs
deleted file mode 100644
index 248453e484..0000000000
--- a/test/cli/run/module-type-fixture/esm/hello.mjs
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
diff --git a/test/cli/run/module-type-fixture/esm/hello.mts b/test/cli/run/module-type-fixture/esm/hello.mts
deleted file mode 100644
index 248453e484..0000000000
--- a/test/cli/run/module-type-fixture/esm/hello.mts
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
diff --git a/test/cli/run/module-type-fixture/esm/hello.ts b/test/cli/run/module-type-fixture/esm/hello.ts
deleted file mode 100644
index 72c037e9a6..0000000000
--- a/test/cli/run/module-type-fixture/esm/hello.ts
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
\ No newline at end of file
diff --git a/test/cli/run/module-type-fixture/esm/hello.tsx b/test/cli/run/module-type-fixture/esm/hello.tsx
deleted file mode 100644
index 72c037e9a6..0000000000
--- a/test/cli/run/module-type-fixture/esm/hello.tsx
+++ /dev/null
@@ -1 +0,0 @@
-console.log(eval("typeof module === 'undefined'"));
\ No newline at end of file
diff --git a/test/cli/run/module-type-fixture/esm/import.cjs b/test/cli/run/module-type-fixture/esm/import.cjs
deleted file mode 100644
index 08c3035d60..0000000000
--- a/test/cli/run/module-type-fixture/esm/import.cjs
+++ /dev/null
@@ -1,3 +0,0 @@
-import * as fs from "node:fs";
-console.log(eval("typeof module === 'undefined'"));
-+fs;
diff --git a/test/cli/run/module-type-fixture/esm/package.json b/test/cli/run/module-type-fixture/esm/package.json
deleted file mode 100644
index 3dbc1ca591..0000000000
--- a/test/cli/run/module-type-fixture/esm/package.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "type": "module"
-}
diff --git a/test/cli/run/run-detect-module-type.ts b/test/cli/run/run-detect-module-type.ts
deleted file mode 100644
index e9b447a198..0000000000
--- a/test/cli/run/run-detect-module-type.ts
+++ /dev/null
@@ -1,54 +0,0 @@
-import { bunEnv, bunExe } from "harness";
-import { join } from "path";
-import { expect, test } from "bun:test";
-
-// module type -> file extensions -> expected module type
-const table = {
-  cjs: {
-    'hello.cjs': 'commonjs',
-    'hello.js': 'commonjs',
-    'hello.mjs': 'module',
-    'hello.ts': 'commonjs',
-    'hello.tsx': 'module',
-    'hello.cts': 'commonjs',
-    'hello.jsx': 'module',
-    'hello.mts': 'module',
-    // files using ES import and no exports will be detected as module
-    "import.cjs": "module",
-  },
-  esm: {
-    'hello.cjs': 'commonjs',
-    'hello.js': 'module',
-    'hello.mjs': 'module',
-    'hello.ts': 'module',
-    'hello.tsx': 'module',
-    'hello.cts': 'commonjs',
-    'hello.jsx': 'module',
-    'hello.mts': 'module',
-    // files using ES import and no exports will be detected as module
-    "import.cjs": "module",
-  },
-};
-
-test("detect module type", () => {
-  const expected = Object.entries(table).map(([moduleType, extensions]) => {
-    return Object.entries(extensions).map(([extension, expected]) => {
-      return `${moduleType} ${extension} -> ${expected}`;
-    });
-  }).flat();
- 
-  const actual = Object.entries(table).map(([moduleType, extensions]) => {
-    return Object.entries(extensions).map(([extension, expected]) => {
-      const proc =  Bun.spawnSync({
-        cmd: [bunExe(), "run", join(import.meta.dir, 'module-type-fixture', moduleType, extension)],
-        env: bunEnv,
-      });
-      if (proc.exitCode !== 0) {
-        throw new Error(`Failed to run ${moduleType} ${extension}: ${proc.stderr.toString('utf8').trim()}`);
-      }
-      return `${moduleType} ${extension} -> ${proc.stdout.toString('utf8').trim() === "false" ? "commonjs" : "module"}`;
-    });
-  }).flat();
-
-  expect(actual).toEqual(expected);
-});
diff --git a/test/internal/ban-words.test.ts b/test/internal/ban-words.test.ts
index 229bdae02c..5d84fc16fb 100644
--- a/test/internal/ban-words.test.ts
+++ b/test/internal/ban-words.test.ts
@@ -27,7 +27,7 @@ const words: Record<string, { reason: string; limit?: number; regex?: boolean }>
   "alloc.ptr !=": { reason: "The std.mem.Allocator context pointer can be undefined, which makes this comparison undefined behavior" },
   "== alloc.ptr": { reason: "The std.mem.Allocator context pointer can be undefined, which makes this comparison undefined behavior" },
   "!= alloc.ptr": { reason: "The std.mem.Allocator context pointer can be undefined, which makes this comparison undefined behavior" },
-  [String.raw`: [a-zA-Z0-9_\.\*\?\[\]\(\)]+ = undefined,`]: { reason: "Do not default a struct field to undefined", limit: 244, regex: true },
+  [String.raw`: [a-zA-Z0-9_\.\*\?\[\]\(\)]+ = undefined,`]: { reason: "Do not default a struct field to undefined", limit: 246, regex: true },
   "usingnamespace": { reason: "This brings Bun away from incremental / faster compile times.", limit: 494 }, 
 };
 const words_keys = [...Object.keys(words)];
diff --git a/test/js/node/module/extensions-fixture/a.custom b/test/js/node/module/extensions-fixture/a.custom
deleted file mode 100644
index e5d94c4c86..0000000000
--- a/test/js/node/module/extensions-fixture/a.custom
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = 'fail'
\ No newline at end of file
diff --git a/test/js/node/module/extensions-fixture/a.js b/test/js/node/module/extensions-fixture/a.js
deleted file mode 100644
index b4c5011785..0000000000
--- a/test/js/node/module/extensions-fixture/a.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = 'a unmodified';
diff --git a/test/js/node/module/extensions-fixture/a.json b/test/js/node/module/extensions-fixture/a.json
deleted file mode 100644
index 6314134f33..0000000000
--- a/test/js/node/module/extensions-fixture/a.json
+++ /dev/null
@@ -1 +0,0 @@
-{ "hello": "world" }
\ No newline at end of file
diff --git a/test/js/node/module/extensions-fixture/a.ts b/test/js/node/module/extensions-fixture/a.ts
deleted file mode 100644
index ae8b40fb8e..0000000000
--- a/test/js/node/module/extensions-fixture/a.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-declare const y: string;
-enum J { x = "hello " }
-const hello: string = "world";
-module.exports = J.x + hello!;
diff --git a/test/js/node/module/extensions-fixture/b.json b/test/js/node/module/extensions-fixture/b.json
deleted file mode 100644
index 7b37d4c855..0000000000
--- a/test/js/node/module/extensions-fixture/b.json
+++ /dev/null
@@ -1 +0,0 @@
-{ "hello
\ No newline at end of file
diff --git a/test/js/node/module/extensions-fixture/c.custom b/test/js/node/module/extensions-fixture/c.custom
deleted file mode 100644
index fabebadd37..0000000000
--- a/test/js/node/module/extensions-fixture/c.custom
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = 'c dot custom'
\ No newline at end of file
diff --git a/test/js/node/module/extensions-fixture/d.js b/test/js/node/module/extensions-fixture/d.js
deleted file mode 100644
index 608be5dd43..0000000000
--- a/test/js/node/module/extensions-fixture/d.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = 'd.js'
\ No newline at end of file
diff --git a/test/js/node/module/extensions-fixture/e.js b/test/js/node/module/extensions-fixture/e.js
deleted file mode 100644
index 95c587acc9..0000000000
--- a/test/js/node/module/extensions-fixture/e.js
+++ /dev/null
@@ -1,4 +0,0 @@
-declare const y: string;
-enum J { x = "hello" }
-const hello: string = " world";
-module.exports = J.x + hello!;
diff --git a/test/js/node/module/require-extensions.test.ts b/test/js/node/module/require-extensions.test.ts
deleted file mode 100644
index 8cd5988ca9..0000000000
--- a/test/js/node/module/require-extensions.test.ts
+++ /dev/null
@@ -1,76 +0,0 @@
-import { test, mock, expect } from "bun:test";
-import path from "path";
-
-test("require.extensions shape makes sense", () => {
-  const extensions = require.extensions;
-  expect(extensions).toBeDefined();
-  expect(typeof extensions).toBe("object");
-  expect(extensions[".js"]).toBeFunction();
-  expect(extensions[".json"]).toBeFunction();
-  expect(extensions[".node"]).toBeFunction();
-  // When --experimental-strip-types is passed, TypeScript files can be loaded.
-  expect(extensions[".cts"]).toBeFunction();
-  expect(extensions[".ts"]).toBeFunction();
-  expect(extensions[".mjs"]).toBeFunction();
-  expect(extensions[".mts"]).toBeFunction();
-});
-test("custom require extension 1", () => {
-  const custom = require.extensions['.custom'] = mock(function (module, filename) {
-    expect(filename).toBe(path.join(import.meta.dir, 'extensions-fixture', 'c.custom'));
-    (module as any)._compile(`module.exports = 'custom';`, filename);
-  });
-  const mod = require('./extensions-fixture/c');
-  expect(mod).toBe('custom');
-  expect(custom.mock.calls.length).toBe(1);
-  delete require.extensions['.custom'];
-  expect(() => require('./extensions-fixture/c')).toThrow(/Cannot find module/);
-  expect(require('./extensions-fixture/c.custom')).toBe('custom'); // already loaded
-  delete require.cache[require.resolve('./extensions-fixture/c.custom')];
-  expect(custom.mock.calls.length).toBe(1);
-  expect(require('./extensions-fixture/c.custom')).toBe('c dot custom'); // use js loader
-});
-test("custom require extension overwrite default loader", () => {
-  const original = require.extensions['.js'];
-  try {
-    const custom = require.extensions['.js'] = mock(function (module, filename) {
-      expect(filename).toBe(path.join(import.meta.dir, 'extensions-fixture', 'd.js'));
-      (module as any)._compile(`module.exports = 'custom';`, filename);
-    });
-    const mod = require('./extensions-fixture/d');
-    expect(mod).toBe('custom');
-    expect(custom.mock.calls.length).toBe(1);
-    require.extensions['.js'] = original;
-    expect(require('./extensions-fixture/d')).toBe('custom'); // already loaded
-    delete require.cache[require.resolve('./extensions-fixture/d')];
-    expect(custom.mock.calls.length).toBe(1);
-    expect(require('./extensions-fixture/d')).toBe('d.js'); // use js loader
-  } finally {
-    require.extensions['.js'] = original;
-  }
-});
-test("custom require extension overwrite default loader with other default loader", () => {
-  const original = require.extensions['.js'];
-  try {
-    require.extensions['.js'] = require.extensions['.ts']!;
-    const mod = require('./extensions-fixture/e.js'); // should not enter JS
-    expect(mod).toBe('hello world');
-  } finally {
-    require.extensions['.js'] = original;
-  }
-});
-test("test that assigning properties weirdly wont do anything bad", () => {
-  const original = require.extensions['.js'];
-  try {
-    function f1() {}
-    function f2() {}
-    require.extensions['.js'] = f1;
-    require.extensions['.abc'] = f2;
-    require.extensions['.js'] = f2;
-    require.extensions['.js'] = undefined;
-    require.extensions['.abc'] = undefined;
-    require.extensions['.abc'] = f1;
-    require.extensions['.js'] = f2;
-  } finally {
-    require.extensions['.js'] = original;
-  }
-});
\ No newline at end of file
diff --git a/test/js/node/test/test-module-multi-extensions.js b/test/js/node/test/test-module-multi-extensions.js
deleted file mode 100644
index 205a030c57..0000000000
--- a/test/js/node/test/test-module-multi-extensions.js
+++ /dev/null
@@ -1,93 +0,0 @@
-'use strict';
-
-// Refs: https://github.com/nodejs/node/issues/4778
-
-const common = require('../common');
-const assert = require('assert');
-const fs = require('fs');
-const Module = require('module');
-const tmpdir = require('../common/tmpdir');
-const file = tmpdir.resolve('test-extensions.foo.bar');
-const dotfile = tmpdir.resolve('.bar');
-const dotfileWithExtension = tmpdir.resolve('.foo.bar');
-
-tmpdir.refresh();
-fs.writeFileSync(file, 'console.log(__filename);', 'utf8');
-fs.writeFileSync(dotfile, 'console.log(__filename);', 'utf8');
-fs.writeFileSync(dotfileWithExtension, 'console.log(__filename);', 'utf8');
-
-{
-  require.extensions['.bar'] = common.mustNotCall();
-  require.extensions['.foo.bar'] = common.mustCall();
-  const modulePath = tmpdir.resolve('test-extensions');
-  require(modulePath);
-  require(file);
-  delete require.cache[file];
-  delete require.extensions['.bar'];
-  delete require.extensions['.foo.bar'];
-  Module._pathCache = { __proto__: null };
-}
-
-{
-  require.extensions['.foo.bar'] = common.mustCall();
-  const modulePath = tmpdir.resolve('test-extensions');
-  require(modulePath);
-  assert.throws(
-    () => require(`${modulePath}.foo`),
-    (err) => err.message.startsWith(`Cannot find module '${modulePath}.foo'`)
-  );
-  require(`${modulePath}.foo.bar`);
-  delete require.cache[file];
-  delete require.extensions['.foo.bar'];
-  Module._pathCache = { __proto__: null };
-}
-
-{
-  const modulePath = tmpdir.resolve('test-extensions');
-  assert.throws(
-    () => require(modulePath),
-    (err) => err.message.startsWith(`Cannot find module '${modulePath}'`)
-  );
-  delete require.cache[file];
-  Module._pathCache = { __proto__: null };
-}
-
-{
-  require.extensions['.bar'] = common.mustNotCall();
-  require.extensions['.foo.bar'] = common.mustCall();
-  const modulePath = tmpdir.resolve('test-extensions.foo');
-  require(modulePath);
-  delete require.cache[file];
-  delete require.extensions['.bar'];
-  delete require.extensions['.foo.bar'];
-  Module._pathCache = { __proto__: null };
-}
-
-{
-  require.extensions['.foo.bar'] = common.mustNotCall();
-  const modulePath = tmpdir.resolve('test-extensions.foo');
-  assert.throws(
-    () => require(modulePath),
-    (err) => err.message.startsWith(`Cannot find module '${modulePath}'`)
-  );
-  delete require.extensions['.foo.bar'];
-  Module._pathCache = { __proto__: null };
-}
-
-{
-  require.extensions['.bar'] = common.mustNotCall();
-  require(dotfile);
-  delete require.cache[dotfile];
-  delete require.extensions['.bar'];
-  Module._pathCache = { __proto__: null };
-}
-
-{
-  require.extensions['.bar'] = common.mustCall();
-  require.extensions['.foo.bar'] = common.mustNotCall();
-  require(dotfileWithExtension);
-  delete require.cache[dotfileWithExtension];
-  delete require.extensions['.bar'];
-  delete require.extensions['.foo.bar'];
-  Module._pathCache = { __proto__: null };
-}