Move WebSocketCtor reference inside createSocket method to support WebSocket mocking #5315
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The kind of change this PR does introduce
Current behavior
The
WebSocketCtoris defined at module scope which captures WebSocket reference before mocking libraries like MSW can intercept it. Since bundlers (webpack/vite) typically load engine.io-client before MSW, the original WebSocket implementation is used even when mocks are applied later.New behavior
WebSocketCtorreference is moved inside thecreateSocketmethod, ensuring it always uses the current value of globalThis.WebSocket at call time. This allows mocking libraries to properly intercept WebSocket connections in Socket.IO.Other information (e.g. related issues)
Fixes mswjs/socket.io-binding#12
I've tested this solution with both webpack and vite, confirming it resolves the issue in both bundlers.