Make `Buffer` mockable

2 files changed, 108 insertions, 83 deletions

diff --git a/src/bun.js/bindings/JSBuffer.cpp b/src/bun.js/bindings/JSBuffer.cpp
index a89492359..58c3dad16 100644
--- a/src/bun.js/bindings/JSBuffer.cpp
+++ b/src/bun.js/bindings/JSBuffer.cpp
@@ -200,7 +200,7 @@ JSC::EncodedJSValue JSBuffer__bufferFromPointerAndLengthAndDeinit(JSC::JSGlobalO
 namespace WebCore {
 using namespace JSC;
 
-static inline JSC::JSUint8Array* JSBuffer__bufferFromLengthAsArray(JSC::JSGlobalObject* lexicalGlobalObject, int length)
+static inline JSC::JSUint8Array* JSBuffer__bufferFromLengthAsArray(JSC::JSGlobalObject* lexicalGlobalObject, int64_t length)
 {
     auto throwScope = DECLARE_THROW_SCOPE(lexicalGlobalObject->vm());
 
@@ -223,7 +223,7 @@ static inline JSC::JSUint8Array* JSBuffer__bufferFromLengthAsArray(JSC::JSGlobal
     RELEASE_AND_RETURN(throwScope, uint8Array);
 }
 
-EncodedJSValue JSBuffer__bufferFromLength(JSC::JSGlobalObject* lexicalGlobalObject, int length)
+EncodedJSValue JSBuffer__bufferFromLength(JSC::JSGlobalObject* lexicalGlobalObject, int64_t length)
 {
     return JSC::JSValue::encode(JSBuffer__bufferFromLengthAsArray(lexicalGlobalObject, length));
 }
@@ -1598,97 +1598,97 @@ JSC_DEFINE_HOST_FUNCTION(jsBufferPrototypeFunction_write, (JSGlobalObject * lexi
 
 static const HashTableValue JSBufferPrototypeTableValues[]
     = {
-          { "asciiSlice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeAsciiSliceCodeGenerator, 2 } },
-          { "asciiWrite"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeAsciiWriteCodeGenerator, 1 } },
-          { "base64Slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeBase64SliceCodeGenerator, 2 } },
-          { "base64Write"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeBase64WriteCodeGenerator, 1 } },
-          { "base64urlSlice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeBase64urlSliceCodeGenerator, 2 } },
-          { "base64urlWrite"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeBase64urlWriteCodeGenerator, 1 } },
+          { "asciiSlice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeAsciiSliceCodeGenerator, 2 } },
+          { "asciiWrite"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeAsciiWriteCodeGenerator, 1 } },
+          { "base64Slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeBase64SliceCodeGenerator, 2 } },
+          { "base64Write"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeBase64WriteCodeGenerator, 1 } },
+          { "base64urlSlice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeBase64urlSliceCodeGenerator, 2 } },
+          { "base64urlWrite"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeBase64urlWriteCodeGenerator, 1 } },
           { "compare"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_compare, 5 } },
           { "copy"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_copy, 4 } },
           { "equals"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_equals, 1 } },
           { "fill"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_fill, 4 } },
-          { "hexSlice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeHexSliceCodeGenerator, 2 } },
-          { "hexWrite"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeHexWriteCodeGenerator, 1 } },
+          { "hexSlice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeHexSliceCodeGenerator, 2 } },
+          { "hexWrite"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeHexWriteCodeGenerator, 1 } },
           { "includes"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_includes, 3 } },
           { "indexOf"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_indexOf, 3 } },
           { "lastIndexOf"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_lastIndexOf, 3 } },
-          { "latin1Slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeLatin1SliceCodeGenerator, 2 } },
-          { "latin1Write"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeLatin1WriteCodeGenerator, 1 } },
-          { "readBigInt64"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigInt64LECodeGenerator, 1 } },
-          { "readBigInt64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigInt64BECodeGenerator, 1 } },
-          { "readBigInt64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigInt64LECodeGenerator, 1 } },
-          { "readBigUInt64"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigUInt64LECodeGenerator, 1 } },
-          { "readBigUInt64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigUInt64BECodeGenerator, 1 } },
-          { "readBigUInt64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigUInt64LECodeGenerator, 1 } },
-          { "readDouble"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadDoubleLECodeGenerator, 1 } },
-          { "readDoubleBE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadDoubleBECodeGenerator, 1 } },
-          { "readDoubleLE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadDoubleLECodeGenerator, 1 } },
-          { "readFloat"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadFloatLECodeGenerator, 1 } },
-          { "readFloatBE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadFloatBECodeGenerator, 1 } },
-          { "readFloatLE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadFloatLECodeGenerator, 1 } },
-          { "readInt16"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt16LECodeGenerator, 1 } },
-          { "readInt16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt16BECodeGenerator, 1 } },
-          { "readInt16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt16LECodeGenerator, 1 } },
-          { "readInt32"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt32LECodeGenerator, 1 } },
-          { "readInt32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt32BECodeGenerator, 1 } },
-          { "readInt32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt32LECodeGenerator, 1 } },
-          { "readInt8"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt8CodeGenerator, 2 } },
-          { "readUInt16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt16BECodeGenerator, 1 } },
-          { "readUInt16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt16LECodeGenerator, 1 } },
-          { "readUInt32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt32BECodeGenerator, 1 } },
-          { "readUInt32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt32LECodeGenerator, 1 } },
-          { "readUInt8"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt8CodeGenerator, 1 } },
-          { "readUint16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt16BECodeGenerator, 1 } },
-          { "readUint16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt16LECodeGenerator, 1 } },
-          { "readUint32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt32BECodeGenerator, 1 } },
-          { "readUint32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt32LECodeGenerator, 1 } },
-          { "readUint8"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt8CodeGenerator, 1 } },
-          { "slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeSliceCodeGenerator, 2 } },
-          { "subarray"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeSliceCodeGenerator, 2 } },
+          { "latin1Slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeLatin1SliceCodeGenerator, 2 } },
+          { "latin1Write"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeLatin1WriteCodeGenerator, 1 } },
+          { "readBigInt64"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigInt64LECodeGenerator, 1 } },
+          { "readBigInt64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigInt64BECodeGenerator, 1 } },
+          { "readBigInt64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigInt64LECodeGenerator, 1 } },
+          { "readBigUInt64"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigUInt64LECodeGenerator, 1 } },
+          { "readBigUInt64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigUInt64BECodeGenerator, 1 } },
+          { "readBigUInt64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadBigUInt64LECodeGenerator, 1 } },
+          { "readDouble"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadDoubleLECodeGenerator, 1 } },
+          { "readDoubleBE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadDoubleBECodeGenerator, 1 } },
+          { "readDoubleLE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadDoubleLECodeGenerator, 1 } },
+          { "readFloat"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadFloatLECodeGenerator, 1 } },
+          { "readFloatBE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadFloatBECodeGenerator, 1 } },
+          { "readFloatLE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadFloatLECodeGenerator, 1 } },
+          { "readInt16"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt16LECodeGenerator, 1 } },
+          { "readInt16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt16BECodeGenerator, 1 } },
+          { "readInt16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt16LECodeGenerator, 1 } },
+          { "readInt32"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt32LECodeGenerator, 1 } },
+          { "readInt32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt32BECodeGenerator, 1 } },
+          { "readInt32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt32LECodeGenerator, 1 } },
+          { "readInt8"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadInt8CodeGenerator, 2 } },
+          { "readUInt16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt16BECodeGenerator, 1 } },
+          { "readUInt16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt16LECodeGenerator, 1 } },
+          { "readUInt32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt32BECodeGenerator, 1 } },
+          { "readUInt32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt32LECodeGenerator, 1 } },
+          { "readUInt8"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt8CodeGenerator, 1 } },
+          { "readUint16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt16BECodeGenerator, 1 } },
+          { "readUint16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt16LECodeGenerator, 1 } },
+          { "readUint32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt32BECodeGenerator, 1 } },
+          { "readUint32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt32LECodeGenerator, 1 } },
+          { "readUint8"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeReadUInt8CodeGenerator, 1 } },
+          { "slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeSliceCodeGenerator, 2 } },
+          { "subarray"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeSliceCodeGenerator, 2 } },
           { "swap16"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_swap16, 0 } },
           { "swap32"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_swap32, 0 } },
           { "swap64"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_swap64, 0 } },
-          { "toJSON"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeToJSONCodeGenerator, 1 } },
+          { "toJSON"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeToJSONCodeGenerator, 1 } },
           { "toString"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_toString, 4 } },
-          { "ucs2Slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUcs2SliceCodeGenerator, 2 } },
-          { "ucs2Write"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUcs2WriteCodeGenerator, 1 } },
-          { "utf16leSlice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUtf16leSliceCodeGenerator, 2 } },
-          { "utf16leWrite"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUtf16leWriteCodeGenerator, 1 } },
-          { "utf8Slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUtf8SliceCodeGenerator, 2 } },
-          { "utf8Write"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUtf8WriteCodeGenerator, 1 } },
+          { "ucs2Slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUcs2SliceCodeGenerator, 2 } },
+          { "ucs2Write"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUcs2WriteCodeGenerator, 1 } },
+          { "utf16leSlice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUtf16leSliceCodeGenerator, 2 } },
+          { "utf16leWrite"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUtf16leWriteCodeGenerator, 1 } },
+          { "utf8Slice"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUtf8SliceCodeGenerator, 2 } },
+          { "utf8Write"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeUtf8WriteCodeGenerator, 1 } },
           { "write"_s, static_cast<unsigned>(JSC::PropertyAttribute::Function), NoIntrinsic, { HashTableValue::NativeFunctionType, jsBufferPrototypeFunction_write, 4 } },
-          { "writeBigInt64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigInt64BECodeGenerator, 1 } },
-          { "writeBigInt64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigInt64LECodeGenerator, 1 } },
-          { "writeBigUInt64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigUInt64BECodeGenerator, 1 } },
-          { "writeBigUInt64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigUInt64LECodeGenerator, 1 } },
-          { "writeBigUint64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigUInt64BECodeGenerator, 1 } },
-          { "writeBigUint64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigUInt64LECodeGenerator, 1 } },
-          { "writeDouble"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteDoubleLECodeGenerator, 1 } },
-          { "writeDoubleBE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteDoubleBECodeGenerator, 1 } },
-          { "writeDoubleLE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteDoubleLECodeGenerator, 1 } },
-          { "writeFloat"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteFloatLECodeGenerator, 1 } },
-          { "writeFloatBE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteFloatBECodeGenerator, 1 } },
-          { "writeFloatLE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteFloatLECodeGenerator, 1 } },
-          { "writeInt16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt16BECodeGenerator, 1 } },
-          { "writeInt16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt16LECodeGenerator, 1 } },
-          { "writeInt32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt32BECodeGenerator, 1 } },
-          { "writeInt32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt32LECodeGenerator, 1 } },
-          { "writeInt8"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt8CodeGenerator, 1 } },
-          { "writeUInt16"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16LECodeGenerator, 1 } },
-          { "writeUInt16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16BECodeGenerator, 1 } },
-          { "writeUInt16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16LECodeGenerator, 1 } },
-          { "writeUInt32"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32LECodeGenerator, 1 } },
-          { "writeUInt32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32BECodeGenerator, 1 } },
-          { "writeUInt32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32LECodeGenerator, 1 } },
-          { "writeUInt8"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt8CodeGenerator, 1 } },
-          { "writeUint16"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16LECodeGenerator, 1 } },
-          { "writeUint16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16BECodeGenerator, 1 } },
-          { "writeUint16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16LECodeGenerator, 1 } },
-          { "writeUint32"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32LECodeGenerator, 1 } },
-          { "writeUint32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32BECodeGenerator, 1 } },
-          { "writeUint32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32LECodeGenerator, 1 } },
-          { "writeUint8"_s, static_cast<unsigned>(JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt8CodeGenerator, 1 } },
+          { "writeBigInt64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigInt64BECodeGenerator, 1 } },
+          { "writeBigInt64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigInt64LECodeGenerator, 1 } },
+          { "writeBigUInt64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigUInt64BECodeGenerator, 1 } },
+          { "writeBigUInt64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigUInt64LECodeGenerator, 1 } },
+          { "writeBigUint64BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigUInt64BECodeGenerator, 1 } },
+          { "writeBigUint64LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteBigUInt64LECodeGenerator, 1 } },
+          { "writeDouble"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteDoubleLECodeGenerator, 1 } },
+          { "writeDoubleBE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteDoubleBECodeGenerator, 1 } },
+          { "writeDoubleLE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteDoubleLECodeGenerator, 1 } },
+          { "writeFloat"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteFloatLECodeGenerator, 1 } },
+          { "writeFloatBE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteFloatBECodeGenerator, 1 } },
+          { "writeFloatLE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteFloatLECodeGenerator, 1 } },
+          { "writeInt16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt16BECodeGenerator, 1 } },
+          { "writeInt16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt16LECodeGenerator, 1 } },
+          { "writeInt32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt32BECodeGenerator, 1 } },
+          { "writeInt32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt32LECodeGenerator, 1 } },
+          { "writeInt8"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteInt8CodeGenerator, 1 } },
+          { "writeUInt16"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16LECodeGenerator, 1 } },
+          { "writeUInt16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16BECodeGenerator, 1 } },
+          { "writeUInt16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16LECodeGenerator, 1 } },
+          { "writeUInt32"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32LECodeGenerator, 1 } },
+          { "writeUInt32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32BECodeGenerator, 1 } },
+          { "writeUInt32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32LECodeGenerator, 1 } },
+          { "writeUInt8"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt8CodeGenerator, 1 } },
+          { "writeUint16"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16LECodeGenerator, 1 } },
+          { "writeUint16BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16BECodeGenerator, 1 } },
+          { "writeUint16LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt16LECodeGenerator, 1 } },
+          { "writeUint32"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32LECodeGenerator, 1 } },
+          { "writeUint32BE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32BECodeGenerator, 1 } },
+          { "writeUint32LE"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt32LECodeGenerator, 1 } },
+          { "writeUint8"_s, static_cast<unsigned>(JSC::PropertyAttribute::Builtin), NoIntrinsic, { HashTableValue::BuiltinGeneratorType, jsBufferPrototypeWriteUInt8CodeGenerator, 1 } },
       };
 
 void JSBufferPrototype::finishCreation(VM& vm, JSC::JSGlobalObject* globalThis)
@@ -1773,8 +1773,8 @@ JSC_DEFINE_HOST_FUNCTION(constructJSBuffer, (JSC::JSGlobalObject * lexicalGlobal
         RELEASE_AND_RETURN(throwScope, (constructBufferEmpty(lexicalGlobalObject, callFrame)));
     }
     JSValue distinguishingArg = callFrame->uncheckedArgument(0);
-    if (distinguishingArg.isNumber()) {
-        RELEASE_AND_RETURN(throwScope, JSBuffer__bufferFromLength(lexicalGlobalObject, distinguishingArg.toInt32(lexicalGlobalObject)));
+    if (distinguishingArg.isAnyInt()) {
+        RELEASE_AND_RETURN(throwScope, JSBuffer__bufferFromLength(lexicalGlobalObject, distinguishingArg.asAnyInt()));
     } else if (distinguishingArg.isString()) {
         RELEASE_AND_RETURN(throwScope, (constructBufferFromStringAndEncoding(lexicalGlobalObject, callFrame)));
     }
diff --git a/test/bun.js/buffer.test.js b/test/bun.js/buffer.test.js
index 4c8603335..d263a80eb 100644
--- a/test/bun.js/buffer.test.js
+++ b/test/bun.js/buffer.test.js
@@ -673,3 +673,28 @@ it("Buffer.toString(base64)", () => {
     );
   }
 });
+
+it("Buffer can be mocked", () => {
+  function MockBuffer() {
+    const noop = function () {};
+    const res = Buffer.alloc(0);
+    for (const op in Buffer.prototype) {
+      if (typeof res[op] === "function") {
+        res[op] = noop;
+      }
+    }
+    return res;
+  }
+
+  const buf = MockBuffer();
+
+  expect(() => {
+    buf.write("hello world");
+    buf.writeUint16BE(0);
+    buf.writeUint32BE(0);
+    buf.writeBigInt64BE(0);
+    buf.writeBigUInt64BE(0);
+    buf.writeBigInt64LE(0);
+    buf.writeBigUInt64LE(0);
+  }).not.toThrow();
+});