InferInput

Kind: Type

Source: src/validator/utils.ts

Utility type to infer input types for validation targets. Preserves literal union types (e.g., 'asc' | 'desc') while using the default ValidationTargets type for other values.

InferInput derives the input type accepted by a validation target. It preserves literal unions such as 'asc' | 'desc' and falls back to ValidationTargets for other target values.

Definition

ts
[Exclude<Output, undefined>] extends [never] ? {} : [Exclude<Output, undefined>] extends [object] ? undefined extends Output ? SimplifyDeep<InferInputInner<Exclude<Output, undefined>, Target, T>> | undefined : SimplifyDeep<InferInputInner<Output, Target, T>> : {}

Diagram

mermaid
graph LR
  A[Validation target type] --> B[InferInput]
  B --> C[Literal union preserved]
  B --> D[Other values use ValidationTargets]

Usage

ts
import type { InferInput } from './validator/utils';

type SortDirection = InferInput<'asc' | 'desc'>;

const direction: SortDirection = 'asc';

// const invalidDirection: SortDirection = 'up'; // Type error

AI Coding Instructions

• Keep literal union types intact when passing them through InferInput.
• Use InferInput for validator-facing input types rather than widening values to string.
• Treat ValidationTargets as the fallback type for inputs that are not preserved literal unions.
• Update related validator type definitions if supported validation target shapes change.