fix(socket.io-client): export reserved-events types to fix ts(4023) on declaration emit

[SnowingFox]

Description

Fixes #5307.

When a downstream consumer re-exports a value whose (inferred) type references socket.io-client's Socket / Manager types, TypeScript's declaration emitter must be able to name the "reserved events" maps those classes are parameterized with. Those maps were not exported, so any tsc --declaration pass over such a consumer failed with:

Exported variable 'X' has or is using name 'SocketReservedEvents' from external module "..." but cannot be named.ts(4023)

As diagnosed in the issue discussion, the failing names (SocketReservedEvents, ManagerReservedEvents, HandshakeData, WriteOptions, TransportReservedEvents, Cookie) are all unexported interfaces.

Changes

Type-only additions (no runtime behaviour change):

• packages/socket.io-client/lib/socket.ts: export SocketReservedEvents
• packages/socket.io-client/lib/manager.ts: export ManagerReservedEvents
• packages/engine.io-client/lib/socket.ts: export SocketReservedEvents, HandshakeData, WriteOptions
• packages/engine.io-client/lib/transport.ts: export TransportReservedEvents
• packages/engine.io-client/lib/globals.node.ts: export Cookie (referenced by the exported parse/CookieJar)
• re-export the new types from both packages' lib/index.ts, following the pattern used for DisconnectDescription in Export DisconnectDescription type directly from 'socket.io-client' #5392

Test

Added a declaration-emit regression fixture at packages/socket.io-client/test/types/ts4023.test.ts that mirrors the issue's reproducer (an exported value whose inferred type references the reserved-events maps of Socket, Manager, the Engine.IO Socket and its Transport). On main it fails with the exact ts(4023) errors reported in the issue:

./node_modules/.bin/tsc -p packages/socket.io-client/test/types/tsconfig.json

After the fix, the same command exits cleanly (verified with the TypeScript version pinned in this repo, ^6.0.3).

Related

• Export DisconnectDescription type directly from 'socket.io-client' #5392 exported DisconnectDescription in the same manner and was merged.