V8 Serialization Format Constants

Enums and constant values for the V8 serialization format.

constants.kLatestVersion

constants.kLatestVersion

The current supported serialization format implemented here.

constants.SerializationTag

constants.SerializationTag()

1-byte tags used to identify the type of the next value.

Notes

These tags are defined in the SerializationTag enum in the v8 src.

Attributes

Name	Description
kArrayBuffer
kArrayBufferTransfer
kArrayBufferView
kBeginDenseJSArray
kBeginJSMap
kBeginJSObject
kBeginJSSet
kBeginSparseJSArray
kBigInt
kBigIntObject
kDate
kDouble
kEndDenseJSArray
kEndJSMap
kEndJSObject
kEndJSSet
kEndSparseJSArray
kError
kFalse
kFalseObject
kHostObject
kInt32
kLegacyReservedBlob
kLegacyReservedBlobIndex
kLegacyReservedCryptoKey
kLegacyReservedDOMFileSystem
kLegacyReservedFile
kLegacyReservedFileIndex
kLegacyReservedFileList
kLegacyReservedFileListIndex
kLegacyReservedImageBitmap
kLegacyReservedImageBitmapTransfer
kLegacyReservedImageData
kLegacyReservedMessagePort
kLegacyReservedOffscreenCanvas
kLegacyReservedRTCCertificate
kNull
kNumberObject
kObjectReference
kOneByteString
kPadding
kRegExp
kResizableArrayBuffer
kSharedArrayBuffer
kSharedObject
kStringObject
kTheHole
kTrue
kTrueObject
kTwoByteString
kUint32
kUndefined
kUtf8String
kVerifyObjectCount
kVersion
kWasmMemoryTransfer
kWasmModuleTransfer

constants.ArrayBufferViewTag

constants.ArrayBufferViewTag()

Attributes

Name	Description
kBigInt64Array
kBigUint64Array
kDataView
kFloat16Array
kFloat32Array
kFloat64Array
kInt16Array
kInt32Array
kInt8Array
kUint16Array
kUint32Array
kUint8Array
kUint8ClampedArray

constants.ArrayBufferViewFlags

constants.ArrayBufferViewFlags()

Attributes

Name	Description
IsBufferResizable
IsLengthTracking

constants.SerializationErrorTag

constants.SerializationErrorTag()

Attributes

Name	Description
Cause	Followed by a JS object: cause.
End	The end of this error information.
EvalErrorPrototype	The error is a EvalError. No accompanying data.
Message	Followed by message: string.
RangeErrorPrototype	The error is a RangeError. No accompanying data.
ReferenceErrorPrototype	The error is a ReferenceError. No accompanying data.
Stack	Followed by stack: string.
SyntaxErrorPrototype	The error is a SyntaxError. No accompanying data.
TypeErrorPrototype	The error is a TypeError. No accompanying data.
UriErrorPrototype	The error is a URIError. No accompanying data.

constants.TagConstraint

constants.TagConstraint(name: str, allowed_tags: TagSet[TagT_co])

A named set of SerializationTags.

Attributes

Name	Description
allowed_tag_names	A human-readable list of SerializationTags allowed by this constraint.
allowed_tags	The set of tags allowed by this constraint.
name	A description of the tags allowed by this constraint.

constants.JS_OBJECT_KEY_TAGS

constants.JS_OBJECT_KEY_TAGS

Tags that are allowed in the context of a JSObject key.

Numbers (except bigint) and strings.

constants.ConstantTags

constants.ConstantTags

constants.JS_CONSTANT_TAGS

constants.JS_CONSTANT_TAGS

Tags for JavaScript constant values.

When deserializing, the default Python values representing the JavaScript constants are:

SerializationTag	JavaScript	Python
kTheHole	(empty array index)	JSHole
kUndefined	undefined	JSUndefined
kNull	null	None
kTrue	true	True
kFalse	false	False

constants.JS_ARRAY_BUFFER_TAGS

constants.JS_ARRAY_BUFFER_TAGS

constants.JS_PRIMITIVE_OBJECT_TAGS

constants.JS_PRIMITIVE_OBJECT_TAGS

SerializationTag values that represent wrapped primitive values.

These are primitive values wrapped in an object on the heap.

constants.PrimitiveObjectTag

constants.PrimitiveObjectTag

The type of the SerializationTag values in JS_PRIMITIVE_OBJECT_TAGS

constants.JS_STRING_TAGS

constants.JS_STRING_TAGS