A TypeScript monorepo was experiencing severe performance issues with 6+ minute build times and sluggish intellisense. Using compiler diagnostics, trace analysis, and the @typescript/analyze-trace tool, the team identified that kysely helper functions with complex type inference were causing 80-second type-checking bottlenecks. By inlining these queries, removing circular dependencies, eliminating barrel files, and cleaning up unused types, they reduced build time by 79% (from 6.2 to 1.3 minutes), cut memory usage in half, and restored responsive editor performance.
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