chromium/out/Default/gen/v8/torque-generated/src/objects/data-handler-tq.inc

class DataHandler;
// Alias for IsDataHandler() that avoids inlining.
// https://source.chromium.org/chromium/chromium/src/+/main:v8/src/objects/data-handler.tq?l=7&c=1
V8_EXPORT_PRIVATE bool IsDataHandler_NonInline(Tagged<HeapObject> o);

// Definition https://source.chromium.org/chromium/chromium/src/+/main:v8/src/objects/data-handler.tq?l=7&c=1
template <class D, class P>
class TorqueGeneratedDataHandler : public P { … };