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Anthropic's usage field returns structured token counts, but no first-party dashboard aggregates them into actionable cost metrics. Build a TypeScript parser, set per-user caps, and instrument the gaps in the official API.

Five battle-tested patterns for satisfying strictPropertyInitialization without definite assignment assertions that mask bugs. Learn when optional properties, constructor methods, and dependency injection give you type safety that holds at runtime.

Learn how TypeScript namespace merging creates companion objects that group class-related utilities without polluting the prototype or global scope.