Retain undefined in spreads with strict null checks#15938
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Previously, both optional and `| undefined` caused spread properties to combine with preceding properties and drop the `undefined`. Now, with strictNullChecks, optional and `| undefined` properties still combine with preceding properties but don't drop the `undefined`.
Add test case and update baselines with new errors
mhegazy
approved these changes
May 18, 2017
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Fixes #14799
Previously, both optional and
| undefinedcaused spread properties to combine with preceding properties and drop theundefined. Now, with strictNullChecks, optional and| undefinedproperties still combine with preceding properties but don't drop theundefined.