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## [4.0.2](https://github.com/socketio/engine.io-parser/compare/4.0.1...4.0.2) (2020-12-07)


### Bug Fixes

* add base64-arraybuffer as prod dependency ([2ccdeb2](https://github.com/socketio/engine.io-parser/commit/2ccdeb277955bed8742a29f2dcbbf57ca95eb12a))


## [2.2.1](https://github.com/socketio/engine.io-parser/compare/2.2.0...2.2.1) (2020-09-30)


## [4.0.1](https://github.com/socketio/engine.io-parser/compare/4.0.0...4.0.1) (2020-09-10)


### Bug Fixes

* use a terser-compatible representation of the separator ([886f9ea](https://github.com/socketio/engine.io-parser/commit/886f9ea7c4e717573152c31320f6fb6c6664061b))


# [4.0.0](https://github.com/socketio/engine.io-parser/compare/v4.0.0-alpha.1...4.0.0) (2020-09-08)

This major release contains the necessary changes for the version 4 of the Engine.IO protocol. More information about the new version can be found [there](https://github.com/socketio/engine.io-protocol#difference-between-v3-and-v4).

Encoding changes between v3 and v4:

- encodePacket with string
  - input: `{ type: "message", data: "hello" }`
  - output in v3: `"4hello"`
  - output in v4: `"4hello"`

- encodePacket with binary
  - input: `{ type: 'message', data: <Buffer 01 02 03> }`
  - output in v3: `<Buffer 04 01 02 03>`
  - output in v4: `<Buffer 01 02 03>`

- encodePayload with strings
  - input: `[ { type: 'message', data: 'hello' }, { type: 'message', data: '€€€' } ]`
  - output in v3: `"6:4hello4:4€€€"`
  - output in v4: `"4hello\x1e4€€€"`

- encodePayload with string and binary
  - input: `[ { type: 'message', data: 'hello' }, { type: 'message', data: <Buffer 01 02 03> } ]`
  - output in v3: `<Buffer 00 06 ff 34 68 65 6c 6c 6f 01 04 ff 04 01 02 03>`
  - output in v4: `"4hello\x1ebAQID"`

Please note that the parser is now dependency-free! This should help reduce the size of the browser bundle.

### Bug Fixes

* keep track of the buffer initial length ([8edf2d1](https://github.com/socketio/engine.io-parser/commit/8edf2d1478026da442f519c2d2521af43ba01832))


### Features

* restore the upgrade mechanism ([6efedfa](https://github.com/socketio/engine.io-parser/commit/6efedfa0f3048506a4ba99e70674ddf4c0732e0c))



# [4.0.0-alpha.1](https://github.com/socketio/engine.io-parser/compare/v4.0.0-alpha.0...v4.0.0-alpha.1) (2020-05-19)


### Features

* implement the version 4 of the protocol ([cab7db0](https://github.com/socketio/engine.io-parser/commit/cab7db0404e0a69f86a05ececd62c8c31f4d97d5))



# [4.0.0-alpha.0](https://github.com/socketio/engine.io-parser/compare/2.2.0...v4.0.0-alpha.0) (2020-02-04)


### Bug Fixes

* properly decode binary packets ([5085373](https://github.com/socketio/engine.io-parser/commit/50853738e0c6c16f9cee0d7887651155f4b78240))


### Features

* remove packet type when encoding binary packets ([a947ae5](https://github.com/socketio/engine.io-parser/commit/a947ae59a2844e4041db58ff36b270d1528b3bee))


### BREAKING CHANGES

* the packet containing binary data will now be sent without any transformation

Protocol v3: { type: 'message', data: <Buffer 01 02 03> } => <Buffer 04 01 02 03>
Protocol v4: { type: 'message', data: <Buffer 01 02 03> } => <Buffer 01 02 03>



# [2.2.0](https://github.com/socketio/engine.io-parser/compare/2.1.3...2.2.0) (2019-09-13)


* [refactor] Use `Buffer.allocUnsafe` instead of `new Buffer` (#104) ([aedf8eb](https://github.com/socketio/engine.io-parser/commit/aedf8eb29e8bf6aeb5c6cc68965d986c4c958ae2)), closes [#104](https://github.com/socketio/engine.io-parser/issues/104)


### BREAKING CHANGES

* drop support for Node.js 4 (since Buffer.allocUnsafe was added in v5.10.0)

Reference: https://nodejs.org/docs/latest/api/buffer.html#buffer_class_method_buffer_allocunsafe_size