Dev builds 349-test TypeScript monorepo with no module mocks using spec-first method

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A developer built 'Blast Radius', a TypeScript monorepo with five packages, by following a strict spec-first workflow using an AI-assisted tool called Kiro. The process involved writing a requirements document, a design document, and a task breakdown before writing a single line of code. This upfront planning resulted in 349 tests and no module mocking, with dependency injection used as the primary testing strategy instead. The developer notes that the architecture remained consistent across all packages because structural decisions were made during the design phase, where changes are inexpensive. The bugs that did emerge were not logic errors but runtime surprises at the boundary between the code and the AWS platform, such as API Gateway timeouts and Node.js runtime issues that only surfaced in deployment.

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