Reduces TypeScript type instantiation counts using measured optimization patterns.
npx skills add https://github.com/romeerez/orchid-orm --skill type-optimizer
Please help me install this Agent Skill. Skill: type-optimizer Source: https://github.com/romeerez/orchid-orm/tree/main/.agents/skills/type-optimizer Command: npx skills add https://github.com/romeerez/orchid-orm --skill type-optimizer
TypeScript projects with heavy generic types can suffer from slow compilation caused by excessive type instantiations. This Skill provides a measured, iterative workflow to reduce Instantiations reported by --extendedDiagnostics without changing runtime behavior.
top-type-optims.js to list documented type optimizations sorted by historical mean instantiation savings from type-optim.md.--extendedDiagnostics, applies one optimization at a time, and keeps only changes that reduce instantiations.update-type-optim-stats.js to record each attempt's instantiation diff into bucketed stats, so future runs prioritize proven optimizations.Use the type-optimizer skill to reduce TypeScript type instantiations in this project, starting with a baseline extendedDiagnostics measurement.
High-intent search queries and answers about installing and using this skill.
Measure a baseline with tsc --extendedDiagnostics, then apply one optimization at a time such as removing redundant intersections, dropping unused generics, or inferring only needed structure. Re-run diagnostics after each change and keep only edits that lower the Instantiations count.
Run the TypeScript compiler with the --extendedDiagnostics flag to see the Instantiations metric, which reflects type-checking workload. High instantiation counts usually come from deeply nested conditional types, repeated indexed access, and large interface inference.
No, the workflow prefers type-only edits and preserves public API behavior unless explicitly allowed. Runtime code is only changed when the task explicitly asks for it, and every attempt is verified against the diagnostics output.
Documented patterns include returning final shapes directly, naming repeated indexed access, avoiding union-to-intersection for optional fields, remapping keys in one pass, and removing cosmetic simplification mapped types from inputs.
Revert any attempt that produces a negative instantiation diff, meaning the count increased, before trying the next idea. Neutral or worse changes should also be undone unless they improve clarity enough to be explicitly accepted.
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