1 files changed, 10 insertions, 0 deletions
diff --git a/dom/webgpu/tests/cts/checkout/src/webgpu/util/binary_stream.ts b/dom/webgpu/tests/cts/checkout/src/webgpu/util/binary_stream.ts
index a6512020e6..2531521dc4 100644
--- a/dom/webgpu/tests/cts/checkout/src/webgpu/util/binary_stream.ts
+++ b/dom/webgpu/tests/cts/checkout/src/webgpu/util/binary_stream.ts
@@ -85,6 +85,16 @@ export default class BinaryStream {
     return this.view.getInt16(this.alignedOffset(2), /* littleEndian */ true);
   }
 
+  /** writeI64() writes a bitint to the buffer at the next 64-bit aligned offset */
+  writeI64(value: bigint) {
+    this.view.setBigInt64(this.alignedOffset(8), value, /* littleEndian */ true);
+  }
+
+  /** readI64() reads a bigint from the buffer at the next 64-bit aligned offset */
+  readI64(): bigint {
+    return this.view.getBigInt64(this.alignedOffset(8), /* littleEndian */ true);
+  }
+
   /** writeI32() writes a int32 to the buffer at the next 32-bit aligned offset */
   writeI32(value: number) {
     this.view.setInt32(this.alignedOffset(4), value, /* littleEndian */ true);