ioutil.Discard
// Discard is an io.Writer on which all Write calls succeed
// without doing anything.
//
// Deprecated: As of Go 1.16, this value is simply io.Discard.
var Discard = io.Discard
ioutil.NopCloser
// NopCloser returns a ReadCloser with a no-op Close method wrapping
// the provided Reader r.
//
// Deprecated: As of Go 1.16, this function simply calls io.NopCloser.
func NopCloser(r io.Reader) io.ReadCloser
ioutil.ReadAll
// ReadAll reads from r until an error or EOF and returns the data it read.
// A successful call returns err == nil, not err == EOF. Because ReadAll is
// defined to read from src until EOF, it does not treat an EOF from Read
// as an error to be reported.
//
// Deprecated: As of Go 1.16, this function simply calls io.ReadAll.
func ReadAll(r io.Reader) ([]byte, error)
ioutil.ReadDir
// ReadDir reads the directory named by dirname and returns
// a list of fs.FileInfo for the directory's contents,
// sorted by filename. If an error occurs reading the directory,
// ReadDir returns no directory entries along with the error.
//
// Deprecated: As of Go 1.16, os.ReadDir is a more efficient and correct choice:
// it returns a list of fs.DirEntry instead of fs.FileInfo,
// and it returns partial results in the case of an error
// midway through reading a directory.
//
// If you must continue obtaining a list of fs.FileInfo, you still can:
//
// entries, err := os.ReadDir(dirname)
// if err != nil { ... }
// infos := make([]fs.FileInfo, 0, len(entries))
// for _, entry := range entries {
// info, err := entry.Info()
// if err != nil { ... }
// infos = append(infos, info)
// }
func ReadDir(dirname string) ([]fs.FileInfo, error)
ioutil.ReadFile
// ReadFile reads the file named by filename and returns the contents.
// A successful call returns err == nil, not err == EOF. Because ReadFile
// reads the whole file, it does not treat an EOF from Read as an error
// to be reported.
//
// Deprecated: As of Go 1.16, this function simply calls os.ReadFile.
func ReadFile(filename string) ([]byte, error)
ioutil.TempDir
// TempDir creates a new temporary directory in the directory dir.
// The directory name is generated by taking pattern and applying a
// random string to the end. If pattern includes a "*", the random string
// replaces the last "*". TempDir returns the name of the new directory.
// If dir is the empty string, TempDir uses the
// default directory for temporary files (see os.TempDir).
// Multiple programs calling TempDir simultaneously
// will not choose the same directory. It is the caller's responsibility
// to remove the directory when no longer needed.
//
// Deprecated: As of Go 1.17, this function simply calls os.MkdirTemp.
func TempDir(dir string, pattern string) (name string, err error)
ioutil.TempFile
// TempFile creates a new temporary file in the directory dir,
// opens the file for reading and writing, and returns the resulting *os.File.
// The filename is generated by taking pattern and adding a random
// string to the end. If pattern includes a "*", the random string
// replaces the last "*".
// If dir is the empty string, TempFile uses the default directory
// for temporary files (see os.TempDir).
// Multiple programs calling TempFile simultaneously
// will not choose the same file. The caller can use f.Name()
// to find the pathname of the file. It is the caller's responsibility
// to remove the file when no longer needed.
//
// Deprecated: As of Go 1.17, this function simply calls os.CreateTemp.
func TempFile(dir string, pattern string) (f *os.File, err error)
ioutil.WriteFile
// WriteFile writes data to a file named by filename.
// If the file does not exist, WriteFile creates it with permissions perm
// (before umask); otherwise WriteFile truncates it before writing, without changing permissions.
//
// Deprecated: As of Go 1.16, this function simply calls os.WriteFile.
func WriteFile(filename string, data []byte, perm fs.FileMode) error