upgrade flow type to 0.33 #3980
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Upgrading flow finds several typing issues (largely due to flow limitation) in compiler.
The first modification is to change
genDatato always returnstring, this requires extractingplainASTElement out.The second modification is to ensure
el.componentpresents when called withgenComponent. The checker does not flow type refinement information to function call. So we need a new parameter for the information.Remaining modifications are solely at type level.