npm/firmware: make new metadata optional

Making the new metadata fields not optional was a breaking change.

Author: dlech

npm/firmware/CHANGELOG.md

@@ -2,6 +2,7 @@
 ## Unreleased
 ### Changed
 - Dropped fallback to default name in `encodeHubName()` on empty string.
+- Use Typescript optional syntax in `FirmwareMetadata` instead of `| undefined`.
 
 ## 4.13.0-rc.1 - 2021-11-19
 ### Added

npm/firmware/index.ts

@@ -63,11 +63,11 @@ export interface FirmwareMetadata {
     /** The maximum firmware size allowed on the hub. */
     'max-firmware-size': number;
     /** The offset to where the hub name is stored in the firmware. (since  v1.1.0) */
-    'hub-name-offset': number | undefined;
+    'hub-name-offset'?: number;
     /** The maximum size of the firmware name in bytes, including the zero-termination. (since  v1.1.0) */
-    'max-hub-name-size': number | undefined;
+    'max-hub-name-size'?: number;
     /** The SHA256 hash of the firmware. (since  v1.1.0) */
-    'firmware-sha256': string | undefined;
+    'firmware-sha256'?: string;
 }
 
 /** Types of errors that can be raised by FirmwareReader. */