Function addTypesToUnion

test/fixtures/snapshot/typescript.js:61153–61159

(typeSet, includes, types)

        // Add the given types to the given type set. Order is preserved, duplicates are removed,
        // and nested types of the given kind are flattened into the set.
        function addTypesToUnion(typeSet, includes, types) {
            for (var _i = 0, types_9 = types; _i < types_9.length; _i++) {
                var type = types_9[_i];
                includes = addTypeToUnion(typeSet, includes, type);
            }
            return includes;
        }
        function removeSubtypes(types, hasObjectTypes) {
            // [] and [T] immediately reduce to [] and [T] respectively
            if (types.length < 2) {