2.1.12 [ECMA-262/6] Section 12.2.6 Object Initializer

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V0042: Object literal enhancements are not supported

The specification states:

 12.2.6 Object Initializer
     ...
     PropertyDefinition[Yield] :
         IdentifierReference[?Yield]
         CoverInitializedName[?Yield]
         PropertyName[?Yield] : AssignmentExpression[In, ?Yield]
         MethodDefinition[?Yield]
     ...
     PropertyName[Yield] :
         LiteralPropertyName
         ComputedPropertyName[?Yield]

IE11 Mode (All versions)

None of the object literal enhancements are supported, so IdentifierReference, MethodDefintion and ComputedProperty don't work.