Add log for handling muliple returned values (#359)

Co-authored-by: Dhruv Srivastava <dhruvdhs.ds@gmail.com>

packages/codegen/README.md

@@ -62,6 +62,8 @@ Steps:
   # NOTE: When passed an *URL* as contract path, it is assumed that it points to an already flattened contract file.
   ```
 
+* Ensure dependencies are installed in the contracts repository before generating the watcher
+
 * Run the following command to generate a watcher from contract(s):
 
   ```bash

packages/codegen/src/templates/package-template.handlebars

@@ -61,6 +61,8 @@
   "devDependencies": {
     "@ethersproject/abi": "^5.3.0",
     "@types/yargs": "^17.0.0",
+    "@types/debug": "^4.1.5",
+    "@types/json-bigint": "^1.0.1",
     "@typescript-eslint/eslint-plugin": "^5.47.1",
     "@typescript-eslint/parser": "^5.47.1",
     "eslint": "^8.35.0",

packages/codegen/src/visitor.ts

@@ -60,32 +60,37 @@ export class Visitor {
 
       let errorMessage = '';
 
-      const typeName = node.returnParameters[0].typeName;
+      if (node.returnParameters.length > 1) {
-      switch (typeName.type) {
+        errorMessage = `No support in codegen for multiple returned values from method ${node.name}`;
-        case 'ElementaryTypeName': {
+      } else {
-          const returnType = typeName.name;
+        const typeName = node.returnParameters[0].typeName;
+        switch (typeName.type) {
+          case 'ElementaryTypeName': {
+            const returnType = typeName.name;
 
-          this._schema.addQuery(name, params, returnType);
+            this._schema.addQuery(name, params, returnType);
-          this._resolvers.addQuery(name, params, returnType);
+            this._resolvers.addQuery(name, params, returnType);
-          this._entity.addQuery(name, params, returnType);
+            this._entity.addQuery(name, params, returnType);
-          this._database.addQuery(name, params, returnType);
+            this._database.addQuery(name, params, returnType);
-          this._client.addQuery(name, params, returnType);
+            this._client.addQuery(name, params, returnType);
 
-          assert(this._contract);
+            assert(this._contract);
-          this._indexer.addQuery(this._contract.name, MODE_ETH_CALL, name, params, returnType);
+            this._indexer.addQuery(this._contract.name, MODE_ETH_CALL, name, params, returnType);
 
-          break;
+            break;
+          }
+
+          case 'UserDefinedTypeName':
+            errorMessage = `No support in codegen for user defined return type from method "${node.name}"`;
+            break;
+
+          case 'ArrayTypeName':
+            errorMessage = `No support in codegen for return type "${typeName.baseTypeName.name}[]" from method "${node.name}"`;
+            break;
+
+          default:
+            errorMessage = `No support in codegen for return type "${typeName.type}" from method "${node.name}"`;
         }
-        case 'UserDefinedTypeName':
-          errorMessage = `No support in codegen for user defined return type from method "${node.name}"`;
-          break;
-
-        case 'ArrayTypeName':
-          errorMessage = `No support in codegen for return type "${typeName.baseTypeName.name}[]" from method "${node.name}"`;
-          break;
-
-        default:
-          errorMessage = `No support in codegen for return type "${typeName.type}" from method "${node.name}"`;
       }
 
       if (errorMessage !== '') {

yarn.lock

@@ -3756,7 +3756,7 @@
   resolved "https://registry.yarnpkg.com/@types/js-yaml/-/js-yaml-4.0.5.tgz#738dd390a6ecc5442f35e7f03fa1431353f7e138"
   integrity sha512-FhpRzf927MNQdRZP0J5DLIdTXhjLYzeUTmLAu69mnVksLH9CJY3IuSeEgbKUki7GQZm0WqDkGzyxju2EZGD2wA==
 
-"@types/json-bigint@^1.0.0":
+"@types/json-bigint@^1.0.0", "@types/json-bigint@^1.0.1":
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/@types/json-bigint/-/json-bigint-1.0.1.tgz#201062a6990119a8cc18023cfe1fed12fc2fc8a7"
   integrity sha512-zpchZLNsNuzJHi6v64UBoFWAvQlPhch7XAi36FkH6tL1bbbmimIF+cS7vwkzY4u5RaSWMoflQfu+TshMPPw8uw==
@@ -6241,7 +6241,7 @@ commander@^2.15.1, commander@^2.20.3:
 
 commander@^8.1.0:
   version "8.3.0"
-  resolved "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-8.3.0.tgz#4837ea1b2da67b9c616a67afbb0fafee567bca66"
   integrity sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==
 
 compare-func@^2.0.0:
@@ -14685,7 +14685,7 @@ solc@0.7.3:
 
 solc@0.8.13:
   version "0.8.13"
-  resolved "https://registry.npmjs.org/solc/-/solc-0.8.13.tgz"
+  resolved "https://registry.yarnpkg.com/solc/-/solc-0.8.13.tgz#bafc7fcc11a627e2281e489076b80497123bb704"
   integrity sha512-C0yTN+rjEOGO6uVOXI8+EKa75SFMuZpQ2tryex4QxWIg0HRWZvCHKfVPuLZ5wx06Sb6GBp6uQA5yqQyXZnXOJw==
   dependencies:
     command-exists "^1.2.8"