Function mapType

test/fixtures/snapshot/typescript.js:69921–69946

(type, mapper, noReductions)

            return type.flags & 1048576 /* TypeFlags.Union */ ? type.types.length : 1;
        }
        function mapType(type, mapper, noReductions) {
            if (type.flags & 131072 /* TypeFlags.Never */) {
                return type;
            }
            if (!(type.flags & 1048576 /* TypeFlags.Union */)) {
                return mapper(type);
            }
            var origin = type.origin;
            var types = origin && origin.flags & 1048576 /* TypeFlags.Union */ ? origin.types : type.types;
            var mappedTypes;
            var changed = false;
            for (var _i = 0, types_17 = types; _i < types_17.length; _i++) {
                var t = types_17[_i];
                var mapped = t.flags & 1048576 /* TypeFlags.Union */ ? mapType(t, mapper, noReductions) : mapper(t);
                changed || (changed = t !== mapped);
                if (mapped) {
                    if (!mappedTypes) {
                        mappedTypes = [mapped];
                    }
                    else {
                        mappedTypes.push(mapped);
                    }
                }
            }
            return changed ? mappedTypes && getUnionType(mappedTypes, noReductions ? 0 /* UnionReduction.None */ : 1 /* UnionReduction.Literal */) : type;
        }
        function mapTypeWithAlias(type, mapper, aliasSymbol, aliasTypeArguments) {
            return type.flags & 1048576 /* TypeFlags.Union */ && aliasSymbol ?
                getUnionType(ts.map(type.types, mapper), 1 /* UnionReduction.Literal */, aliasSymbol, aliasTypeArguments) :