fix: Typegen handles structs and vectors of structs without erroring (#4743)

Author: zannis

packages/typegen/src/util/derived.spec.ts

@@ -41,4 +41,21 @@ describe('getSimilarTypes', (): void => {
       'Vec<Vec<Balance>>'
     ]);
   });
+
+  it('handles structs', (): void => {
+    expect(getSimilarTypes(registry, {}, '{ "a": "u8", "b": "Vec<u8>" }', mockImports)).toEqual([
+      `{
+    readonly a: u8;
+    readonly b: Bytes;
+  } & Struct`, '{ a?: any; b?: any }', 'string', 'Uint8Array'
+    ]);
+  });
+  it('handles vectors of structs', (): void => {
+    expect(getSimilarTypes(registry, {}, 'Vec<{ "a": "H256", "b": "Vec<H256>" }>', mockImports)).toEqual([
+      `Vec<{
+    readonly a: H256;
+    readonly b: Vec<H256>;
+  } & Struct>`
+    ]);
+  });
 });

packages/typegen/src/util/derived.ts

@@ -60,6 +60,8 @@ export function getSimilarTypes (registry: Registry, definitions: Record<string,
         possibleTypes.push(`([${subs.join(', ')}])[]`);
       } else if (subDef.info === TypeDefInfo.VecFixed) {
         // TODO: Add possibleTypes so imports work
+      } else if (subDef.info === TypeDefInfo.Struct) {
+        // TODO: Add possibleTypes so imports work
       } else {
         throw new Error(`Unhandled subtype in Vec, ${stringify(subDef)}`);
       }