API: expose IntrinsicType

[ajafff]

TypeScript Version: 2.7.2, 2.8.0-dev.20180228

Search Terms: IntrinsicType

There's currently no (official) way to distinguish the literal types true and false.

Although ts.TypeFlags.BooleanLiteral is included in ts.TypeFlags.Literal it's no ts.LiteralType. Therefore I cannot access the value of the literal. I need access to the internal ts.IntrinsicType for that.

TSLint just declared the type in their project, which might break at any time...

My current workaround is checker.typeToString(type) === 'false'.

If you expose ts.IntrinsicType, does it make sense to expose ts.TypeFlags.Intrisic too?

[honewatson]

+1 for exposing IntrinsicType.

Currently the declaration file returns Type for getTypeAtLocation however this will return a variety of child interfaces of Type. At run time you end up having properties which are not part of the Type interface. It would be easier to work with getTypeAtLocation if it returned a Union Type of the Type interface derivatives.