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Chris Tate
2a0489a334
The rewrites decide on a read's non-nullish receivers, since the analysis
also gives an absent key's read undefined (ns.util before ns.util = {...}
runs). A rewrite then removed the property access, so a receiver that was
in fact null or undefined no longer threw.
- A read whose receiver may also be nullish is rewritten to the read as
written followed by the replacement in a comma expression: a direct
reference becomes (recv.k, name) and a folded member (recv.k, literal),
so a nullish receiver throws Node's TypeError and any other receiver
yields the same value.
- A function table call through such a table reads table[key] first,
before its arguments, where the call reads it.
- The static-tables case reads, calls and dispatches through receivers
that are the constant object or undefined, and records the ts7
baselines of the npm cases added in this change.