ErrorWithCause: add .code and .domain

docs/ERRORS.md

@@ -46,6 +46,8 @@ The `CameraError` type is a baseclass type for all other errors and provides the
 * `message`: A non-localized message text that provides a more information and context about the error and possibly problematic values.
 * (optional) `cause`: An `ErrorWithCause` instance that provides information about the cause of the error.
   * `cause.message`: The message of the error that caused the camera error. This is localized on iOS.
+  * (iOS) `cause.code`: The native error's error-code. (iOS only)
+  * (iOS) `cause.domain`: The native error's domain. (iOS only)
   * (iOS) `cause.details`: More dictionary-style information about the cause. (iOS only)
   * (Android) `cause.stacktrace`: A native Java stacktrace for the cause.
   * (optional) `cause.cause`: The cause that caused the given error. (Recursive)

ios/CameraView.swift

@@ -463,7 +463,12 @@ final class CameraView: UIView {
 
     var causeDictionary: [String: Any]?
     if let cause = cause {
-      causeDictionary = ["message": cause.localizedDescription, "details": cause.userInfo]
+      causeDictionary = [
+        "code": cause.code,
+        "domain": cause.domain,
+        "message": cause.localizedDescription,
+        "details": cause.userInfo
+      ]
     }
     onError([
       "code": error.code,

src/CameraError.ts

@@ -37,6 +37,20 @@ export type SystemError = 'system/no-camera-manager';
 export type UnknownError = 'unknown/unknown';
 
 export interface ErrorWithCause {
+  /**
+   * The native error's code.
+   *
+   * * iOS: `NSError.code`
+   * * Android: N/A
+   */
+  code?: number;
+  /**
+   * The native error's domain.
+   *
+   * * iOS: `NSError.domain`
+   * * Android: N/A
+   */
+  domain?: string;
   /**
    * The native error description (Localized on iOS)
    *