Function getCommonSupertype

test/fixtures/snapshot/typescript.js:67389–67397

(types)

                ts.reduceLeft(types, function (s, t) { return isTypeSubtypeOf(s, t) ? t : s; });
        }
        function getCommonSupertype(types) {
            if (!strictNullChecks) {
                return getSupertypeOrUnion(types);
            }
            var primaryTypes = ts.filter(types, function (t) { return !(t.flags & 98304 /* TypeFlags.Nullable */); });
            return primaryTypes.length ?
                getNullableType(getSupertypeOrUnion(primaryTypes), getFalsyFlagsOfTypes(types) & 98304 /* TypeFlags.Nullable */) :
                getUnionType(types, 2 /* UnionReduction.Subtype */);
        }
        // Return the leftmost type for which no type to the right is a subtype.
        function getCommonSubtype(types) {
            return ts.reduceLeft(types, function (s, t) { return isTypeSubtypeOf(t, s) ? t : s; });