Bumps [engine.io](https://github.com/socketio/engine.io) from 4.0.2 to 4.1.2.
- [Release notes](https://github.com/socketio/engine.io/releases)
- [Changelog](https://github.com/socketio/engine.io/blob/4.1.2/CHANGELOG.md)
- [Commits](socketio/engine.io@4.0.2...4.1.2)

---
updated-dependencies:
- dependency-name: engine.io
  dependency-type: direct:development
...

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Bumps [ajv](https://github.com/ajv-validator/ajv) from 6.10.2 to 6.12.6.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v6.10.2...v6.12.6)

---
updated-dependencies:
- dependency-name: ajv
  dependency-type: indirect
...

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Bumps [cached-path-relative](https://github.com/ashaffer/cached-path-relative) from 1.0.2 to 1.1.0.
- [Release notes](https://github.com/ashaffer/cached-path-relative/releases)
- [Commits](https://github.com/ashaffer/cached-path-relative/commits)

---
updated-dependencies:
- dependency-name: cached-path-relative
  dependency-type: indirect
...

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Related:

- https://bugs.webkit.org/show_bug.cgi?id=228296
- socketio/socket.io#4263

The server will now include a "maxPayload" field in the handshake
details, allowing the clients to decide how many packets they have to
send to stay under the maxHttpBufferSize value.

Related:

- socketio/socket.io-client#1531
- socketio/engine.io@088dcb4

See also: https://github.com/nodejs/Release

The close event will now include additional details to help debugging
if anything has gone wrong.

Example when a payload is over the maxHttpBufferSize value in HTTP
long-polling mode:

```js
socket.on("close", (reason, details) => {
  console.log(reason); // "transport error"

  // in that case, details is an error object
  console.log(details.message); "xhr post error"
  console.log(details.description); // 413 (the HTTP status of the response)

  // details.context refers to the XMLHttpRequest object
  console.log(details.context.status); // 413
  console.log(details.context.responseText); // ""
});
```

Note: the error object was already included before this commit and is
kept for backward compatibility

Example when a payload is over the maxHttpBufferSize value with
WebSockets:

```js
socket.on("close", (reason, details) => {
  console.log(reason); // "transport close"

  // in that case, details is a plain object
  console.log(details.description); // "websocket connection closed"

  // details.context is a CloseEvent object
  console.log(details.context.code); // 1009 (which means "Message Too Big")
  console.log(details.context.reason); // ""
});
```

Example within a cluster without sticky sessions:

```js
socket.on("close", (reason, details) => {
  console.log(details.context.status); // 400
  console.log(details.context.responseText); // '{"code":1,"message":"Session ID unknown"}'
});
```

Note: we could also print some warnings in development for the "usual"
errors:

- CORS error
- HTTP 400 with multiple nodes
- HTTP 413 with maxHttpBufferSize

but that would require an additional step when going to production
(i.e. setting NODE_ENV variable to "production"). This is open to
discussion!

Related:

- socketio/socket.io#3946
- socketio/socket.io#1979
- socketio/socket.io-client#1518

In the past, there were two implementations of the HTTP long-polling
feature, one with XMLHttpRequest and one based on JSONP for ancient
browsers (IE7/IE8). The JSONP implementation has been removed in [1].

[1]: b2c7381

This commit allows to:

- provide an ESM version of those modules ([1])
- reduce the attack surface in case of supply chain attacks
- reduce the size of the bundle with tree-shaking

As a downside, we won't receive security updates for those modules
anymore.

[1]: socketio/socket.io-client#1536

Release notes: https://github.com/socketio/emitter/releases/tag/3.1.0

Diff: 6.1.1...6.2.0

In order to make sure the types added in [1] are included.

[1]: socketio/engine.io-parser@ad5bd7d