You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: append.go
    path of file: ./repos/hugo/common/collections
    
    the code of the file until where you have to start completion: // Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package collections

import (
	"fmt"
	"reflect"
)

// Append appends from to a slice to and returns the resulting slice.
// If length of from is one and the only element is a slice of same type as to,
// it will be appended.
func Append(to any, from ...any) (any, error) {
	if len(from) == 0 {
		return to, nil
	}
	tov, toIsNil := indirect(reflect.ValueOf(to))

	toIsNil = toIsNil || to == nil
	var tot reflect.Type

	if !toIsNil {
		if tov.Kind() == reflect.Slice {
			// Create a copy of tov, so we don't modify the original.
			c := reflect.MakeSlice(tov.Type(), tov.Len(), tov.Len()+len(from))
			reflect.Copy(c, tov)
			tov = c
		}

		if tov.Kind() != reflect.Slice {
			return nil, fmt.Errorf("expected a slice, got %T", to)
		}

		tot = tov.Type().Elem()
		if tot.Kind() == reflect.Slice {
			totvt := tot.Elem()
			fromvs := make([]reflect.Value, len(from))
			for i, f := range from {
				fromv := reflect.ValueOf(f)
				from
    
func Append(to any, from ...any) (any, error) {
	if len(from) == 0 {
		return to, nil
	}
	tov, toIsNil := indirect(reflect.ValueOf(to))

	toIsNil = toIsNil || to == nil
	var tot reflect.Type

	if !toIsNil {
		if tov.Kind() == reflect.Slice {
			// Create a copy of tov, so we don't modify the original.
			c := reflect.MakeSlice(tov.Type(), tov.Len(), tov.Len()+len(from))
			reflect.Copy(c, tov)
			tov = c
		}

		if tov.Kind() != reflect.Slice {
			return nil, fmt.Errorf("expected a slice, got %T", to)
		}

		tot = tov.Type().Elem()
		if tot.Kind() == reflect.Slice {
			totvt := tot.Elem()
			fromvs := make([]reflect.Value, len(from))
			for i, f := range from {
				fromv := reflect.ValueOf(f)
				fromt := fromv.Type()
				if fromt.Kind() == reflect.Slice {
					fromt = fromt.Elem()
				}
				if totvt != fromt {
					return nil, fmt.Errorf("cannot append slice of %s to slice of %s", fromt, totvt)
				} else {
					fromvs[i] = fromv
				}
			}
			return reflect.Append(tov, fromvs...).Interface(), nil

		}

		toIsNil = tov.Len() == 0

		if len(from) == 1 {
			fromv := reflect.ValueOf(from[0])
			if !fromv.IsValid() {
				// from[0] is nil
				return appendToInterfaceSliceFromValues(tov, fromv)
			}
			fromt := fromv.Type()
			if fromt.Kind() == reflect.Slice {
				fromt = fromt.Elem()
			}
			if fromv.Kind() == reflect.Slice {
				if toIsNil {
					// If we get nil []string, we just return the []string
					return from[0], nil
				}

				// If we get []string []string, we append the from slice to to
				if tot == fromt {
					return reflect.AppendSlice(tov, fromv).Interface(), nil
				} else if !fromt.AssignableTo(tot) {
					// Fall back to a []interface{} slice.
					return appendToInterfaceSliceFromValues(tov, fromv)
				}

			}
		}
	}

	if toIsNil {
		return Slice(from...), nil
	}

	for _, f := range from {
		fv := reflect.ValueOf(f)
		if !fv.IsValid() || !fv.Type().AssignableTo(tot) {
			// Fall back to a []interface{} slice.
			tov, _ := indirect(reflect.ValueOf(to))
			return appendToInterfaceSlice(tov, from...)
		}
		tov = reflect.Append(tov, fv)
	}

	return tov.Interface(), nil
}