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How Twitch tamed a million lines of TypeScript
Million Lines of TypeScript December 21, 2025 At Twitch, my team’s charter was to define and maintain core engineering standards: performance constraints, architectural patterns, TypeScript usage, tests, and lint rules. These weren’t preferences — they were the mechanisms that allowed a million-line monolithic codebase to scale across 300 developers shipping code in a fast-moving environment.
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