Clarify that raw React types can be used in libdefs. (#1956)
Clarify that raw React types can be used in libdefs. (#1956)


orlandoc01/flow-typed,splodingsocks/FlowTyped,doberkofler/flow-typed,doberkofler/flow-typed,flowtype/flow-typed,splodingsocks/FlowTyped,flowtype/flow-typed,mwalkerwells/flow-typed,orlandoc01/flow-typed,mwalkerwells/flow-typed