deno.land / x / typebox@0.32.21 / changelog / 0.29.2.md
0.29.2
Overview
Revision 0.29.2 includes enhancements to Type.Index
This revision contains no breaking changes
Contents
- Enhancements
Modifier Index Resolver
Revision 0.29.2 re-introduces optional property narrowing for Indexed Access Types. This functionality is specific when indexing overlapping properties with one or more optional modifiers. Revision 0.28.0 attempted to implement this narrowing, however was pulled due to instantiation issues raised on issue 419 (specific to composite narrowing)
Revision 0.29.2 attempts to re-introduce this functionality using a different resolution strategy. It uses Indexed Access Types as the construct in which to apply such narrowing and expands upon Union and Intersection type normalization for optional modifier unwrap and remapping. This approach unifies Composite inference with Index Access Types and makes provisions for a possible Type.Mapped feature in later releases.
Indexed Intersect
The following are the index resolver cases for intersect types.
Case 1
const T = Type.Intersect([
Type.Object({ x: Type.Optional(Type.Number()) }),
Type.Object({ x: Type.Optional(Type.Number()) })
])
const I = Type.Index(T, ['x'])
// type I = TOptional<TUnion<[TNumber, TNumber]>>Case 2
const T = Type.Intersect([
Type.Object({ x: Type.Optional(Type.Number()) }),
Type.Object({ x: Type.Number() })
])
const I = Type.Index(T, ['x'])
// type I = TUnion<[TNumber, TNumber]>Case 3
const T = Type.Intersect([
Type.Object({ x: Type.Number() }),
Type.Object({ x: Type.Number() })
])
const I = Type.Index(T, ['x'])
// type I = TUnion<[TNumber, TNumber]>Indexed Union
The following are the index resolver cases for union types.
Case 1
const T = Type.Union([
Type.Object({ x: Type.Optional(Type.Number()) }),
Type.Object({ x: Type.Optional(Type.Number()) })
])
const I = Type.Index(T, ['x'])
// type I = TOptional<TUnion<[TNumber, TNumber]>>Case 2
const T = Type.Union([
Type.Object({ x: Type.Optional(Type.Number()) }),
Type.Object({ x: Type.Number() })
])
const I = Type.Index(T, ['x'])
// type I = TOptional<TUnion<[TNumber, TNumber]>>Case 3
const T = Type.Union([
Type.Object({ x: Type.Number() }),
Type.Object({ x: Type.Number() })
])
const I = Type.Index(T, ['x'])
// type I = TUnion<[TNumber, TNumber]>Composite
The following are the resolver cases for indexed types when applied to composite intersection.
Case 1
const T = Type.Composite([
Type.Object({ x: Type.Optional(Type.Number()) }),
Type.Object({ x: Type.Optional(Type.Number()) })
])
// type T = TObject<{
// x: TOptional<TUnion<[TNumber, TNumber]>>
// }>Case 2
const T = Type.Composite([
Type.Object({ x: Type.Optional(Type.Number()) }),
Type.Object({ x: Type.Number() })
])
// type T = TObject<{
// x: TUnion<[TNumber, TNumber]>
// }>Case 3
const T = Type.Composite([
Type.Object({ x: Type.Number() }),
Type.Object({ x: Type.Number() })
])
// type T = TObject<{
// x: TUnion<[TNumber, TNumber]>
// }>Version Info
