Function write

write<TBuffer>(fd, buffer, offset?, length?, position?, callback): void
Write buffer to the file specified by fd.

offset determines the part of the buffer to be written, and length is an integer specifying the number of bytes to write.

position refers to the offset from the beginning of the file where this data should be written. If typeof position !== 'number', the data will be written at the current position. See pwrite(2).

The callback will be given three arguments (err, bytesWritten, buffer) wherebytesWritten specifies how many bytes were written from buffer.

If this method is invoked as its util.promisify() ed version, it returns a promise for an Object with bytesWritten and buffer properties.

It is unsafe to use fs.write() multiple times on the same file without waiting for the callback. For this scenario, createWriteStream is recommended.

On Linux, positional writes don't work when the file is opened in append mode. The kernel ignores the position argument and always appends the data to the end of the file.
Type Parameters
- TBuffer extends ArrayBufferView
Parameters
- fd: number
- buffer: TBuffer
- Optional offset: null | number
- Optional length: null | number
- Optional position: null | number
- callback: ((err, written, buffer) => void)
  - - (err, written, buffer): void
    - Parameters
      err: null | ErrnoException
      written: number
      buffer: TBuffer
      Returns void
Returns void
Since
v0.0.2
- Defined in node_modules/@types/node/fs.d.ts:2371
write<TBuffer>(fd, buffer, offset, length, callback): void
Asynchronously writes buffer to the file referenced by the supplied file descriptor.
Type Parameters
- TBuffer extends ArrayBufferView
Parameters
- fd: number
  A file descriptor.
- buffer: TBuffer
- offset: undefined | null | number
  The part of the buffer to be written. If not supplied, defaults to 0.
- length: undefined | null | number
  The number of bytes to write. If not supplied, defaults to buffer.length - offset.
- callback: ((err, written, buffer) => void)
  - - (err, written, buffer): void
    - Parameters
      err: null | ErrnoException
      written: number
      buffer: TBuffer
      Returns void
Returns void
- Defined in node_modules/@types/node/fs.d.ts:2385
write<TBuffer>(fd, buffer, offset, callback): void
Asynchronously writes buffer to the file referenced by the supplied file descriptor.
Type Parameters
- TBuffer extends ArrayBufferView
Parameters
- fd: number
  A file descriptor.
- buffer: TBuffer
- offset: undefined | null | number
  The part of the buffer to be written. If not supplied, defaults to 0.
- callback: ((err, written, buffer) => void)
  - - (err, written, buffer): void
    - Parameters
      err: null | ErrnoException
      written: number
      buffer: TBuffer
      Returns void
Returns void
- Defined in node_modules/@types/node/fs.d.ts:2397
write<TBuffer>(fd, buffer, callback): void
Asynchronously writes buffer to the file referenced by the supplied file descriptor.
Type Parameters
- TBuffer extends ArrayBufferView
Parameters
- fd: number
  A file descriptor.
- buffer: TBuffer
- callback: ((err, written, buffer) => void)
  - - (err, written, buffer): void
    - Parameters
      err: null | ErrnoException
      written: number
      buffer: TBuffer
      Returns void
Returns void
- Defined in node_modules/@types/node/fs.d.ts:2407
write(fd, string, position, encoding, callback): void
Asynchronously writes string to the file referenced by the supplied file descriptor.
Parameters
- fd: number
  A file descriptor.
- string: string
  A string to write.
- position: undefined | null | number
  The offset from the beginning of the file where this data should be written. If not supplied, defaults to the current position.
- encoding: undefined | null | BufferEncoding
  The expected string encoding.
- callback: ((err, written, str) => void)
  - - (err, written, str): void
    - Parameters
      err: null | ErrnoException
      written: number
      str: string
      Returns void
Returns void
- Defined in node_modules/@types/node/fs.d.ts:2419
write(fd, string, position, callback): void
Asynchronously writes string to the file referenced by the supplied file descriptor.
Parameters
- fd: number
  A file descriptor.
- string: string
  A string to write.
- position: undefined | null | number
  The offset from the beginning of the file where this data should be written. If not supplied, defaults to the current position.
- callback: ((err, written, str) => void)
  - - (err, written, str): void
    - Parameters
      err: null | ErrnoException
      written: number
      str: string
      Returns void
Returns void
- Defined in node_modules/@types/node/fs.d.ts:2432
write(fd, string, callback): void
Asynchronously writes string to the file referenced by the supplied file descriptor.
Parameters
- fd: number
  A file descriptor.
- string: string
  A string to write.
- callback: ((err, written, str) => void)
  - - (err, written, str): void
    - Parameters
      err: null | ErrnoException
      written: number
      str: string
      Returns void
Returns void
- Defined in node_modules/@types/node/fs.d.ts:2443

Function write

Type Parameters

TBuffer extends ArrayBufferView

Parameters

fd: number

buffer: TBuffer

Optional offset: null | number

Optional length: null | number

Optional position: null | number

callback: ((err, written, buffer) => void)

Parameters

err: null | ErrnoException

written: number

buffer: TBuffer

Returns void

Returns void

Since

Type Parameters

TBuffer extends ArrayBufferView

Parameters

fd: number

buffer: TBuffer

offset: undefined | null | number

length: undefined | null | number

callback: ((err, written, buffer) => void)

Parameters

err: null | ErrnoException

written: number

buffer: TBuffer

Returns void

Returns void

Type Parameters

TBuffer extends ArrayBufferView

Parameters

fd: number

buffer: TBuffer

offset: undefined | null | number

callback: ((err, written, buffer) => void)

Parameters

err: null | ErrnoException

written: number

buffer: TBuffer

Returns void

Returns void

Type Parameters

TBuffer extends ArrayBufferView

Parameters

fd: number

buffer: TBuffer

callback: ((err, written, buffer) => void)

Parameters

err: null | ErrnoException

written: number

buffer: TBuffer

Returns void

Returns void

Parameters

fd: number

string: string

position: undefined | null | number

encoding: undefined | null | BufferEncoding

callback: ((err, written, str) => void)

Parameters

err: null | ErrnoException

written: number

str: string

Returns void

Returns void

Parameters

fd: number

string: string

position: undefined | null | number

callback: ((err, written, str) => void)

Parameters

err: null | ErrnoException

written: number

str: string

Returns void

Returns void

Parameters

`Optional` offset: null | number

`Optional` length: null | number

`Optional` position: null | number