Support new pure HOC component (#1173)

backend/attachRendererFiber.js

@@ -82,6 +82,8 @@ function getInternalReactConstants(version) {
  FORWARD_REF_SYMBOL_STRING: 'Symbol(react.forward_ref)',
  PROFILER_NUMBER: 0xead2,
  PROFILER_SYMBOL_STRING: 'Symbol(react.profiler)',
+ PURE_NUMBER: 0xead3,
+ PURE_SYMBOL_STRING: 'Symbol(react.pure)',
  STRICT_MODE_NUMBER: 0xeacc,
  STRICT_MODE_SYMBOL_STRING: 'Symbol(react.strict_mode)',
  PLACEHOLDER_NUMBER: 0xead1,
@@ -127,6 +129,8 @@ function attachRendererFiber(hook: Hook, rid: string, renderer: ReactRenderer):
  CONTEXT_PROVIDER_SYMBOL_STRING,
  PROFILER_NUMBER,
  PROFILER_SYMBOL_STRING,
+ PURE_NUMBER,
+ PURE_SYMBOL_STRING,
  STRICT_MODE_NUMBER,
  STRICT_MODE_SYMBOL_STRING,
  PLACEHOLDER_NUMBER,
@@ -258,6 +262,17 @@ function attachRendererFiber(hook: Hook, rid: string, renderer: ReactRenderer):
  : symbolOrNumber;
 
  switch (switchValue) {
+ case PURE_NUMBER:
+ case PURE_SYMBOL_STRING:
+ nodeType = 'Special';
+ if (type.displayName) {
+ name = type.displayName;
+ } else {
+ const displayName = type.render.displayName || type.render.name;
+ name = displayName ? `Pure(${displayName})` : 'Pure';
+ }
+ children = [];
+ break;
  case CONCURRENT_MODE_NUMBER:
  case CONCURRENT_MODE_SYMBOL_STRING:
  case DEPRECATED_ASYNC_MODE_SYMBOL_STRING: