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test/static/rest.ts

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+import { Expect } from './assert'
+import { Type, Static } from '@sinclair/typebox'
+{
+  // union never
+  const A = Type.String()
+  const B = Type.Union(Type.Rest(A))
+  Expect(B).ToStaticNever()
+}
+{
+  // intersect never
+  const A = Type.String()
+  const B = Type.Intersect(Type.Rest(A))
+  Expect(B).ToStaticNever()
+}
+{
+  // tuple
+  const A = Type.Tuple([Type.Number(), Type.String()])
+  const B = Type.Union(Type.Rest(A))
+  Expect(B).ToStatic<string | number>()
+}
+{
+  // tuple spread
+  const A = Type.Tuple([Type.Literal(1), Type.Literal(2)])
+  const B = Type.Tuple([Type.Literal(3), Type.Literal(4)])
+  const C = Type.Tuple([...Type.Rest(A), ...Type.Rest(B)])
+  Expect(C).ToStatic<[1, 2, 3, 4]>()
+}
+{
+  // union to intersect
+  const A = Type.Object({ x: Type.Number() })
+  const B = Type.Object({ y: Type.String() })
+  const C = Type.Union([A, B])
+  const D = Type.Intersect(Type.Rest(C))
+  Expect(D).ToStatic<
+    {
+      x: number
+    } & {
+      y: string
+    }
+  >()
+}
+{
+  // intersect to composite
+  const A = Type.Object({ x: Type.Number() })
+  const B = Type.Object({ y: Type.String() })
+  const C = Type.Intersect([A, B])
+  const D = Type.Composite(Type.Rest(C))
+  Expect(D).ToStatic<{
+    x: number
+    y: string
+  }>()
+}