1 files changed, 45 insertions, 0 deletions
diff --git a/dom/webgpu/tests/cts/checkout/src/webgpu/util/unions.ts b/dom/webgpu/tests/cts/checkout/src/webgpu/util/unions.ts
new file mode 100644
index 0000000000..23381ddee9
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/src/webgpu/util/unions.ts
@@ -0,0 +1,45 @@
+/**
+ * Reifies a `GPUOrigin3D` into a `Required<GPUOrigin3DDict>`.
+ */
+export function reifyOrigin3D(
+  val: Readonly<GPUOrigin3DDict> | Iterable<number>
+): Required<GPUOrigin3DDict> {
+  if (Symbol.iterator in val) {
+    const v = Array.from(val as Iterable<number>);
+    return {
+      x: v[0] ?? 0,
+      y: v[1] ?? 0,
+      z: v[2] ?? 0,
+    };
+  } else {
+    const v = val as Readonly<GPUOrigin3DDict>;
+    return {
+      x: v.x ?? 0,
+      y: v.y ?? 0,
+      z: v.z ?? 0,
+    };
+  }
+}
+
+/**
+ * Reifies a `GPUExtent3D` into a `Required<GPUExtent3DDict>`.
+ */
+export function reifyExtent3D(
+  val: Readonly<GPUExtent3DDict> | Iterable<number>
+): Required<GPUExtent3DDict> {
+  if (Symbol.iterator in val) {
+    const v = Array.from(val as Iterable<number>);
+    return {
+      width: v[0] ?? 1,
+      height: v[1] ?? 1,
+      depthOrArrayLayers: v[2] ?? 1,
+    };
+  } else {
+    const v = val as Readonly<GPUExtent3DDict>;
+    return {
+      width: v.width ?? 1,
+      height: v.height ?? 1,
+      depthOrArrayLayers: v.depthOrArrayLayers ?? 1,
+    };
+  }
+}