TypeScript patterns recommended
TypeScript Type Inference
TypeScript type inference patterns including Zod inference, const assertions, satisfies operator, utility types, and when to let TypeScript infer vs explicit annotations.
- Difficulty
- intermediate
- Read time
- 1 min read
- Version
- v1.0.0
- Confidence
- established
- Last updated
Quick Reference
TypeScript Inference: Use z.infer<typeof schema> for Zod types. Use as const for literal types. Use satisfies for validation without widening. Let TS infer simple types, annotate function params. typeof extracts value types. ReturnType/Parameters extract function types. Awaited unwraps promises.
Use When
- Deriving types from runtime validators
- Preserving literal types
- Extracting types from values
- Working with function types
Skip When
- Simple explicit type annotations
- External API types
TypeScript Type Inference
TypeScript type inference patterns including Zod inference, const assertions, satisfies operator, utility types, and when to let TypeScript infer vs explicit annotations.