1 files changed, 12 insertions, 1 deletions
diff --git a/packages/taler-util/src/codec.ts b/packages/taler-util/src/codec.ts
index 54d450d82..b04ce0612 100644
--- a/packages/taler-util/src/codec.ts
+++ b/packages/taler-util/src/codec.ts
@@ -146,7 +146,7 @@ class UnionCodecBuilder<
   constructor(
     private discriminator: TagPropertyLabel,
     private baseCodec?: Codec<CommonBaseType>,
-  ) {}
+  ) { }
 
   /**
    * Define a property for the object.
@@ -491,6 +491,17 @@ export function codecOptional<V>(innerCodec: Codec<V>): Codec<V | undefined> {
   };
 }
 
+export function codecOptionalDefault<V>(innerCodec: Codec<V>, def: V): Codec<V> {
+  return {
+    decode(x: any, c?: Context): V {
+      if (x === undefined || x === null) {
+        return def;
+      }
+      return innerCodec.decode(x, c);
+    },
+  };
+}
+
 export function codecForLazy<V>(innerCodec: () => Codec<V>): Codec<V> {
   let instance: Codec<V> | undefined = undefined
   return {