Function isThenableType

test/fixtures/snapshot/typescript.js:81329–81336

* Determines whether a type is an object with a callable `then` member.

(type)

         * Determines whether a type is an object with a callable `then` member.
         */
        function isThenableType(type) {
            if (allTypesAssignableToKind(type, 131068 /* TypeFlags.Primitive */ | 131072 /* TypeFlags.Never */)) {
                // primitive types cannot be considered "thenable" since they are not objects.
                return false;
            }
            var thenFunction = getTypeOfPropertyOfType(type, "then");
            return !!thenFunction && getSignaturesOfType(getTypeWithFacts(thenFunction, 2097152 /* TypeFacts.NEUndefinedOrNull */), 0 /* SignatureKind.Call */).length > 0;
        }
        function isAwaitedTypeInstantiation(type) {
            var _a;
            if (type.flags & 16777216 /* TypeFlags.Conditional */) {