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test/static/enum.ts

@@ -0,0 +1,42 @@
+import { Expect } from './assert'
+import { Type } from '@sinclair/typebox'
+
+{
+  // expect all variants
+  enum E {
+    A,
+    B = 'hello',
+    C = 42,
+  }
+  const T = Type.Enum(E)
+  Expect(T).ToStatic<E.A | E.B | E.C>()
+}
+{
+  // expect all variants
+  const T = Type.Enum({
+    A: 1,
+    B: 2,
+    C: 3,
+  })
+  Expect(T).ToStatic<1 | 2 | 3>()
+}
+{
+  // expect variant overlap to reduce
+  const T = Type.Enum({
+    A: 1,
+    B: 2,
+    C: 2, // overlap
+  })
+  Expect(T).ToStatic<1 | 2>()
+}
+{
+  // expect empty enum to be string (as empty enums T[keyof T] evaluates as string)
+  enum E {}
+  const T = Type.Enum(E)
+  Expect(T).ToStatic<string>()
+}
+{
+  // expect empty enum to be never
+  const T = Type.Enum({})
+  Expect(T).ToStaticNever()
+}