1 files changed, 28 insertions, 5 deletions
diff --git a/packages/taler-util/src/codec.ts b/packages/taler-util/src/codec.ts
index b04ce0612..cd727a792 100644
--- a/packages/taler-util/src/codec.ts
+++ b/packages/taler-util/src/codec.ts
@@ -83,6 +83,7 @@ interface Alternative {
 
 class ObjectCodecBuilder<OutputType, PartialOutputType> {
   private propList: Prop[] = [];
+  private _allowExtra: boolean = false;
 
   /**
    * Define a property for the object.
@@ -98,6 +99,11 @@ class ObjectCodecBuilder<OutputType, PartialOutputType> {
     return this as any;
   }
 
+  allowExtra(): ObjectCodecBuilder<OutputType, PartialOutputType> {
+    this._allowExtra = true;
+    return this;
+  }
+
   /**
    * Return the built codec.
    *
@@ -106,6 +112,7 @@ class ObjectCodecBuilder<OutputType, PartialOutputType> {
    */
   build(objectDisplayName: string): Codec<PartialOutputType> {
     const propList = this.propList;
+    const allowExtra = this._allowExtra;
     return {
       decode(x: any, c?: Context): PartialOutputType {
         if (!c) {
@@ -129,6 +136,20 @@ class ObjectCodecBuilder<OutputType, PartialOutputType> {
           );
           obj[prop.name] = propVal;
         }
+        for (const prop in x) {
+          if (prop in obj) {
+            continue;
+          }
+          if (allowExtra) {
+            obj[prop] = x[prop];
+          } else {
+            logger.warn(
+              `Extra property ${prop} for ${objectDisplayName} at ${renderContext(
+                c,
+              )}`,
+            );
+          }
+        }
         return obj as PartialOutputType;
       },
     };
@@ -146,7 +167,7 @@ class UnionCodecBuilder<
   constructor(
     private discriminator: TagPropertyLabel,
     private baseCodec?: Codec<CommonBaseType>,
-  ) { }
+  ) {}
 
   /**
    * Define a property for the object.
@@ -491,7 +512,10 @@ export function codecOptional<V>(innerCodec: Codec<V>): Codec<V | undefined> {
   };
 }
 
-export function codecOptionalDefault<V>(innerCodec: Codec<V>, def: V): Codec<V> {
+export function codecOptionalDefault<V>(
+  innerCodec: Codec<V>,
+  def: V,
+): Codec<V> {
   return {
     decode(x: any, c?: Context): V {
       if (x === undefined || x === null) {
@@ -503,18 +527,17 @@ export function codecOptionalDefault<V>(innerCodec: Codec<V>, def: V): Codec<V>
 }
 
 export function codecForLazy<V>(innerCodec: () => Codec<V>): Codec<V> {
-  let instance: Codec<V> | undefined = undefined
+  let instance: Codec<V> | undefined = undefined;
   return {
     decode(x: any, c?: Context): V {
       if (instance === undefined) {
-        instance = innerCodec()
+        instance = innerCodec();
       }
       return instance.decode(x, c);
     },
   };
 }
 
-
 export type CodecType<T> = T extends Codec<infer X> ? X : any;
 
 export function codecForEither<T extends Array<Codec<unknown>>>(