Preserve literal types in TypeScript constants with as const satisfies.
npx skills add https://github.com/ncaq/konoka --skill as-const-satisfies
Please help me install this Agent Skill. Skill: as-const-satisfies Source: https://github.com/ncaq/konoka/tree/main/plugins/web-tasuke/skills/as-const-satisfies Command: npx skills add https://github.com/ncaq/konoka --skill as-const-satisfies
Type-safe constants and config objects in TypeScript often lose literal precision, resulting in looser types and potential runtime errors. The as const pattern preserves literal types, and as const satisfies Type enables both literal retention and structural conformance.
Define a constants object and apply as const or as const satisfies Type to preserve literal types and enforce type relationships.
High-intent search queries and answers about installing and using this skill.
To preserve literal types in TypeScript constants, apply the as const assertion to your object or variable. This prevents the compiler from widening literal values to their base types, ensuring exact string or numeric literals are retained for strict type safety.
Using as const satisfies Type is the best way to enforce structural conformance on config objects while keeping exact literal values. This TypeScript pattern validates the object against a target type without widening the inferred literal types.
Yes, the satisfies operator works with as const for string unions. Combining them allows you to validate that your constant conforms to a specific string union type while retaining the exact literal string values for type safety.
TypeScript configuration objects lose literal precision because the compiler widens literal types to their base types by default. Applying as const prevents this widening, retaining exact literal types to avoid looser types and potential runtime errors.
You need to use as const satisfies Type when defining fixed sets of statuses, configuration fields, or string unions that demand strict literal type checks. It ensures the compiler validates structural conformance while preserving exact literal values.
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