The series of Command objects generated by the pipeline is then run by an interpreter using runEffect(checkoutFlow(cartSummary)). Because our business logic consists of pure functions that interact with the world only through data, we can record those interactions simply by adding a few hooks for services like OpenTelemetry. And if we can record them, we can replay them deterministically. Best of all, there’s no need to mock a single database or external service.
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（三）居民委员会所有和使用的设施的管理使用情况；，详情可参考同城约会
— Jake Lucky 🔜 GDC (@JakeSucky) June 5, 2024