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example/prototypes/union-oneof.ts

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+/*--------------------------------------------------------------------------
+
+@sinclair/typebox/prototypes
+
+The MIT License (MIT)
+
+Copyright (c) 2017-2025 Haydn Paterson (sinclair) <haydn.developer@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+---------------------------------------------------------------------------*/
+
+import { TypeRegistry, Kind, Static, TSchema, SchemaOptions } from '@sinclair/typebox'
+import { Value } from '@sinclair/typebox/value'
+
+// -------------------------------------------------------------------------------------
+// TUnionOneOf
+// -------------------------------------------------------------------------------------
+export interface TUnionOneOf<T extends TSchema[]> extends TSchema {
+  [Kind]: 'UnionOneOf'
+  static: { [K in keyof T]: Static<T[K]> }[number]
+  oneOf: T
+}
+// -------------------------------------------------------------------------------------
+// UnionOneOf
+// -------------------------------------------------------------------------------------
+/** `[Experimental]` Creates a Union type with a `oneOf` schema representation */
+export function UnionOneOf<T extends TSchema[]>(oneOf: [...T], options: SchemaOptions = {}) {
+  function UnionOneOfCheck(schema: TUnionOneOf<TSchema[]>, value: unknown) {
+    return 1 === schema.oneOf.reduce((acc: number, schema: any) => (Value.Check(schema, value) ? acc + 1 : acc), 0)
+  }
+  if (!TypeRegistry.Has('UnionOneOf')) TypeRegistry.Set('UnionOneOf', UnionOneOfCheck)
+  return { ...options, [Kind]: 'UnionOneOf', oneOf } as TUnionOneOf<T>
+}