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+# 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.
+
+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')
+```
+
+### collecting
+
+```js
+mp.collect().then(all => {
+ // all is an array of all the data emitted
+ // encoding is supported in this case, so
+ // so the result will be a collection of strings if
+ // an encoding is specified, or buffers/objects if not.
+ //
+ // In an async function, you may do
+ // const data = await stream.collect()
+})
+```
+
+### iteration
+
+You can iterate over streams synchronously or asynchronously in
+platforms that support it.
+
+Synchronous iteration will end when the currently available data is
+consumed, even if the `end` event has not been reached. In string and
+buffer mode, the data is concatenated, so unless multiple writes are
+occurring in the same tick as the `read()`, sync iteration loops will
+generally only have a single iteration.
+
+To consume chunks in this way exactly as they have been written, with
+no flattening, create the stream with the `{ objectMode: true }`
+option.
+
+```js
+const mp = new Minipass({ objectMode: true })
+mp.write('a')
+mp.write('b')
+for (let letter of mp) {
+ console.log(letter) // a, b
+}
+mp.write('c')
+mp.write('d')
+for (let letter of mp) {
+ console.log(letter) // c, d
+}
+mp.write('e')
+mp.end()
+for (let letter of mp) {
+ console.log(letter) // e
+}
+for (let letter of mp) {
+ console.log(letter) // nothing
+}
+```
+
+Asynchronous iteration will continue until the end event is reached,
+consuming all of the data.
+
+```js
+const mp = new Minipass({ encoding: 'utf8' })
+
+// some source of some data
+let i = 5
+const inter = setInterval(() => {
+ if (i --> 0)
+ mp.write(Buffer.from('foo\n', 'utf8'))
+ else {
+ mp.end()
+ clearInterval(inter)
+ }
+}, 100)
+
+// consume the data with asynchronous iteration
+async function consume () {
+ for await (let chunk of mp) {
+ console.log(chunk)
+ }
+ return 'ok'
+}
+
+consume().then(res => console.log(res))
+// logs `foo\n` 5 times, and then `ok`
+```