Preface

Prepend data to a stream or file.

API

const preface = require('preface')
const PrependStream = require('preface').PrependStream

class PrependStream extends Transform

A transform stream that prepends data to the incoming stream.

new PrependStream(data, options)

Creates a new instance of PrependStream.

• data: String|Buffer|null: The data to prepend to the input stream. Can accept any object in object mode.
• options: Object: Options to pass to the Transform constructor.
• options.enc: String: Encoding of the data to push.

preface(inputStream, data, [options])

Returns a new instance of PrependStream constructed with the specified arguments. This is in a way just a function version to set up the PrependStream class.

• inputStream: stream.Readable (or any Readable-compatible API)
• data: String|Buffer|null or any: Data to prepend to the stream. Can accept any object in object mode.
• options: Object: options to pass to the PrependStream constructor.

CLI

Install as a global module to do some awesome:

• First unnamed argument: Data to prepend to the stream.
• -i / --in: Path to input file. Uses standard input if not provided.
• -o / --out: Path to output file. Uses standard output if not provided.

Examples:

• echo 1234 | preface abcd (Try this one!)
• preface abcd < in.txt > out.txt
• preface abcd --in in.txt --out out.txt

License

MIT