TypeScript Development Skill

An agentic skill for developing, reviewing, configuring, and migrating TypeScript 7 projects with runtime-faithful, readable, inference-first type design.

The complete skill is in typescript-development/. Add or link that directory to the skills location used by your agentic development environment.

The skill covers:

• advanced inference and generic API design;
• definition-driven and schema-driven types;
• global, module, and framework type augmentation;
• satisfies, as const, type guards, and safe runtime boundaries;
• type-mismatch repair, sound nullish defaults, and tightly controlled assertion escape hatches;
• control-flow narrowing, never, and refactor-safe exhaustiveness;
• TSDoc, public API documentation, implementation comments, and descriptive naming;
• DRY domain-model composition;
• TypeScript 7 configuration and migration;
• tsc, tsc-watch, and tsx development loops;
• type-level and runtime verification.

Its priorities are runtime truth, intuitive use, one source of truth, and compiler-enforced refactor safety. Sophisticated type machinery is welcome when it is localized, named, documented, and tested—and makes the code using it meaningfully simpler.

Start with typescript-development/SKILL.md. Supporting references are loaded as needed from typescript-development/references/.