Act as a senior frontend infrastructure engineer. Build The Frontend Race Condition Reproduction Lab, an interactive environment for understanding and reproducing asynchronous UI bugs.
Create a simulated application where users can configure search requests, autocomplete, pagination, form submissions, background refreshes, and rapidly changing filters.
The lab should:
Allow users to control artificial network latency and response order.
Reproduce stale responses overwriting newer UI state.
Demonstrate duplicate submissions and out-of-order updates.
Compare unsafe implementations with fixes using cancellation, request identifiers, debouncing, or state guards.
Visualize the sequence of events on a timeline.
Track requests started, completed, cancelled, ignored, and rendered.
Generate deterministic reproduction steps from a failing scenario.
Produce regression tests for the selected fix.
Include resettable experiments and explanatory annotations.
Use simulated network requests so experiments run without a backend. Make the behavior genuinely interactive: users should be able to trigger the race condition, observe the bug, apply a fix, and rerun the same scenario to verify the result.
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