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Review/enforce possible values / types of tracked object properties

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#1124 aperta il 1 nov 2017

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In ObjectValue.js, there's a list of trackedPropertyNames.

Tracked objects must be void or a (subtype of a) Value. After state joins, an AbstractValue may appear (encoding a conditional expression), or possibly other Value kinds due to simplification rules. Maybe there's some special logic in place for arrays (otherwise, how does $MapData and $SetData and $WeakMapData and $WeakSetData work as tracked objects?)

We should...

  • Document the actual requirements where trackedPropertyNames is defined
  • Consider including type information in trackedPropertyNames and issuing type invariant checks as part of the property injection in setupTrackedPropertyAccessors.
  • Manually review all static Flow types of tracked properties to check if they conform

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