# minipass A _very_ minimal implementation of a [PassThrough stream](https://nodejs.org/api/stream.html#stream_class_stream_passthrough) [It's very fast](https://docs.google.com/spreadsheets/d/1oObKSrVwLX_7Ut4Z6g3fZW-AX1j1-k6w-cDsrkaSbHM/edit#gid=0) for objects, strings, and buffers. Supports pipe()ing (including multi-pipe() and backpressure transmission), buffering data until either a `data` event handler or `pipe()` is added (so you don't lose the first chunk), and most other cases where PassThrough is a good idea. There is a `read()` method, but it's much more efficient to consume data from this stream via `'data'` events or by calling `pipe()` into some other stream. Calling `read()` requires the buffer to be flattened in some cases, which requires copying memory. Also, `read()` always returns Buffers, even if an `encoding` option is specified. There is also no `unpipe()` method. Once you start piping, there is no stopping it! If you set `objectMode: true` in the options, then whatever is written will be emitted. Otherwise, it'll do a minimal amount of Buffer copying to ensure proper Streams semantics when `read(n)` is called. This is not a `through` or `through2` stream. It doesn't transform the data, it just passes it right through. If you want to transform the data, extend the class, and override the `write()` method. Once you're done transforming the data however you want, call `super.write()` with the transform output. For an example of a stream that extends MiniPass to provide transform capabilities, check out [minizlib](http://npm.im/minizlib). ## USAGE ```js const MiniPass = require('minipass') const mp = new MiniPass(options) // optional: { encoding } mp.write('foo') mp.pipe(someOtherStream) mp.end('bar') ```