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# pack-ops mixin
This mixin adds the ability to consume or create packfile streams.
This depends on the repo already having:
- `loadRaw(hash) => raw-binary`
- `saveRaw(hash, raw-binary) =>`
And then adds:
- `unpack(stream, opts) => hashes`
- `pack(hashes, opts) => stream`
The streams are simple-stream format. This means they have a `.read(callback)`
method for pulling items out of the stream.
Example:
```js
var packOps = require('js-git/mixins/pack-ops');
packOps(repo);
repo.unpack(stream, opts, function (err, hashes) {
// hashes is imported objects
});
repo.pack(hashes, opts, function (err, stream) {
if (err) throw err;
stream.read(onRead);
function onRead(err, item) {
if (err) throw err;
console.log(item);
if (item) stream.read(onRead);
}
});
```