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# sonic-boom [](https://travis-ci.org/mcollina/sonic-boom)
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Extremely fast utf8-only stream implementation to write to files and
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file descriptors.
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This implementation is partial, but support backpressure and `.pipe()` in is here.
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However, it is 2-3x faster than Node Core `fs.createWriteStream()`:
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```
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benchSonic*1000: 2215.220ms
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benchSonicSync*1000: 8315.173ms
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benchSonic4k*1000: 2184.558ms
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benchSonicSync4k*1000: 1733.582ms
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benchCore*1000: 6513.752ms
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```
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Note that sync mode without buffering is _slower_ than a Node Core WritableStream, however
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this mode matches the expected behavior of `console.log()`.
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Note that if this is used to log to a windows terminal (`cmd.exe` or
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powershell), it is needed to run `chcp 65001` in the terminal to
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correctly display utf-8 characters, see
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[chcp](https://ss64.com/nt/chcp.html) for more details.
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## Install
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```
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npm i sonic-boom
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```
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## Example
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```js
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'use strict'
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const SonicBoom = require('sonic-boom')
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const sonic = new SonicBoom(process.stdout.fd) // or '/path/to/destination'
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for (var i = 0; i < 10; i++) {
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sonic.write('hello sonic\n')
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}
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```
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## API
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### SonicBoom(String|Number, [minLength], [sync])
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Creates a new instance of SonicBoom.
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The first argument can be:
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1. a string that is a path to a file to be written to (mode `'a'`)
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2. a file descriptor, something that is returned by `fs.open` or
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`fs.openSync`.
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The second argument is the minimum length of the internal buffer that is
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required before flushing.
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The third argument is a flag that, when true, causes `SonicBoom` to perform synchronous writes.
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It will emit the `'ready'` event when a file descriptor is available.
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### SonicBoom#write(string)
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Writes the string to the file.
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It will return false to signal the producer to slow down.
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### SonicBoom#flush()
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Writes the current buffer to the file if a write was not in progress.
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Do nothing if `minLength` is zero or if it is already writing.
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### SonicBoom#reopen([file])
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Reopen the file in place, useful for log rotation.
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Example:
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```js
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const stream = new SonicBoom('./my.log')
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process.on('SIGUSR2', function () {
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stream.reopen()
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})
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```
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### SonicBoom#flushSync()
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Flushes the buffered data synchronously. This is a costly operation.
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### SonicBoom#end()
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Closes the stream, the data will be flushed down asynchronously
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### SonicBook#destroy()
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Closes the stream immediately, the data is not flushed.
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## License
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MIT
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