fix: allow to decode 0x as 0 for keyType Array

src/lib/Untitled-1

@@ -0,0 +1,23 @@
+import { ERC725 } from '@erc725/erc725.js';
+
+const schema = [
+  {
+    name: 'LSP3Profile',
+    key: '0x5ef83ad9559033e6e941db7d7c495acdce616347d28e90c7ce47cbfcfcad3bc5',
+    keyType: 'Singleton',
+    valueType: 'bytes',
+    valueContent: 'VerifiableURI',
+  },
+];
+
+const erc725 = new ERC725(schema);
+const encodedVerifiableURI =
+  '0x00008019f9b10020ed9808e44f28535d4673424413c06ce26210077628eddf95da6acba96f0b9e25697066733a2f2f6261666b72656967706176746475357035796d6a637a62346a35696d3434326f6e76336735693767747a6b6c3234336e3763616e71796d646e6334';
+
+const result = erc725.decodeData([
+  {
+    keyName: 'LSP3Profile',
+    value: encodedVerifiableURI,
+  },
+]);
+console.log(JSON.stringify(result, null, 4));

src/lib/decodeData.test.ts

@@ -284,6 +284,27 @@ describe('decodeData', () => {
     expect(decodedData.value).to.eql(3);
   });
 
+  it('parses type Array correctly, just the array length but return 0 if value is 0x', () => {
+    const decodedData = decodeData(
+      {
+        keyName: 'LSP12IssuedAssets[]',
+        value: '0x',
+      },
+      [
+        {
+          name: 'LSP12IssuedAssets[]',
+          key: '0x7c8c3416d6cda87cd42c71ea1843df28ac4850354f988d55ee2eaa47b6dc05cd',
+          keyType: 'Array',
+          valueContent: 'Address',
+          valueType: 'address',
+        },
+      ],
+    );
+
+    expect(decodedData.name).to.eql('LSP12IssuedAssets[]');
+    expect(decodedData.value).to.eql(0);
+  });
+
   it('decodes dynamic keys', () => {
     const decodedData = decodeData(
       [

src/lib/decodeData.ts

@@ -201,8 +201,10 @@ export function decodeKey(schema: ERC725JSONSchema, value) {
       }
 
       // Decode as a Number when when the encoded value is to set the Array length only
-      if (typeof value === 'string' && countNumberOfBytes(value) === 16) {
-        return decodeKeyValue('Number', 'uint128', value, schema.name) || 0;
+      if (typeof value === 'string') {
+        if (value === '0x' || countNumberOfBytes(value) === 16) {
+          return decodeKeyValue('Number', 'uint128', value, schema.name) || 0;
+        }
       }
 
       const valueElement = value.find((e) => e.key === schema.key);