Fix conditional type variance #22869
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@DanielRosenwasser @mhegazy I think we should include this one in 2.8.1. |
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it is a bit late for 2.8.1, but should be in 2.8.2 |
mhegazy
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Mar 26, 2018
ahejlsberg
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Mar 26, 2018
Fix conditional type variance
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This PR adds a missing type relationship for conditional types: Two conditional types
T1 extends U1 ? X1 : Y1andT2 extends U2 ? X2 : Y2are related ifT1andT2is related to the other,U1andU2are identical types,X1is related toX2, andY1is related toY2.Fixes #22860.