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Correct handling of union types in expressions - #1765
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Anders Hejlsberg (ahejlsberg)
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Jan 21, 2015
Correct handling of union types in expressions
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Fixes #1715 (and others like it).
This PR corrects our handling of union types for certain expression operators. Specifically, where operators support operands of certain kinds of types we now also support unions of those kinds of types. For example, in an index access
a[x]we now allowxto be a union type such asstring | numberorEnum1 | Enum2, and in an arithmetic operation such asx * ywe allow the operands to be unions composed of enum types.