V8 13.0 Deprecations #55452

Another PR is updated V8 to 13.0, so I compiled a list of deprecations from that version onward. While they don't need to be fixed immediately, it's important to know they exist.

• template<class T> struct v8::FastApiTypedArray

  • Reason: When an API function expects a TypedArray as a parameter, the type in the signature should be v8::Local<v8::Value> instead of FastApiTypedArray<>.
  • Action: Type-check the parameter and convert it to v8::Local<v8::TypedArray> to access the data. Handle the parameter the same way as for a regular API call.
  • Details:

    ‘template<class T> struct v8::FastApiTypedArray’ is deprecated: 
    When an API function expects a TypedArray as a parameter, 
    the type in the signature should be `v8::Local<v8::Value>` instead of FastApiTypedArray<>. 
    The API function then has to type-check the parameter and convert it to a `v8::Local<v8::TypedArray` to access the data. 
    In essence, the parameter should be handled the same as for a regular API call. 
    

• v8::Local<v8::Value> v8::Object::GetPrototype() (src: switch from Get/SetPrototype to Get/SetPrototypeV2 #55453)

  • Reason: V8 will stop providing access to the hidden prototype (i.e., JSGlobalObject).
  • Action: Use GetPrototypeV2() instead.
  • Reference: crbug.com/333672197
  • Details:

    ‘v8::Local<v8::Value> v8::Object::GetPrototype()’ is deprecated: 
    V8 will stop providing access to hidden prototype (i.e. JSGlobalObject). 
    Use GetPrototypeV2() instead. See http://crbug.com/333672197. 
    

• v8::Maybe<bool> v8::Object::SetPrototype(v8::Local<v8::Context>, v8::Local<v8::Value>) (src: switch from Get/SetPrototype to Get/SetPrototypeV2 #55453)

  • Reason: V8 will stop providing access to the hidden prototype (i.e., JSGlobalObject).
  • Action: Use SetPrototypeV2() instead.
  • Reference: crbug.com/333672197
  • Details:

    ‘v8::Maybe<bool> v8::Object::SetPrototype(v8::Local<v8::Context>, v8::Local<v8::Value>)’ is deprecated: 
    V8 will stop providing access to hidden prototype (i.e. JSGlobalObject). 
    Use SetPrototypeV2() instead. See http://crbug.com/333672197. 
    

• v8::SnapshotCreator::SnapshotCreator(v8::Isolate*, const intptr_t*, const v8::StartupData*, bool) (src: migrate from deprecated SnapshotCreator constructor #55337)

  • Reason: Deprecated in favor of a version that passes CreateParams.
  • Action: Use the version that passes CreateParams.
  • Details:

    ‘v8::SnapshotCreator::SnapshotCreator(v8::Isolate*, const intptr_t*, const v8::StartupData*, bool)’ is deprecated: 
    Use the version that passes CreateParams instead. 
    

• v8::String::Value::Value(v8::Isolate*, v8::Local<v8::Value>) (src: migrate String::Value to String::ValueView #55458)

  • Reason: Prefer alternatives for better performance.
  • Action: Use String::ValueView if possible, or use string->Write to a buffer if not.
  • Details:

    ‘v8::String::Value::Value(v8::Isolate*, v8::Local<v8::Value>)’ is deprecated: 
    Prefer using String::ValueView if you can, or string->Write to a buffer if you cannot. 
    

• void v8::Isolate::AttachCppHeap(v8::CppHeap*)

  • Reason: Set the heap on Isolate creation.
  • Action: Use CreateParams instead.
  • Details:

    ‘void v8::Isolate::AttachCppHeap(v8::CppHeap*)’ is deprecated: 
    Set the heap on Isolate creation using CreateParams instead. 
    

• void v8::Isolate::DetachCppHeap()

  • Reason: Set the heap on Isolate creation.
  • Action: Use CreateParams instead.
  • Details:

    ‘void v8::Isolate::DetachCppHeap()’ is deprecated: 
    Set the heap on Isolate creation using CreateParams instead.