add test for error handling

package.json

@@ -12,7 +12,7 @@
   "license": "ISC",
   "dependencies": {
     "invariant": "^2.2.4",
-    "ts-json-rpc-server": "0.0.4"
+    "ts-json-rpc-server": "0.0.5"
   },
   "devDependencies": {
     "@types/express": "^4.17.0",
@@ -28,5 +28,8 @@
   "publishConfig": {
     "registry": "https://registry.npmjs.org/"
   },
-  "files": ["src/*.js", "src/*.d.ts"]
+  "files": [
+    "src/*.js",
+    "src/*.d.ts"
+  ]
 }

src/rpc-client.test.ts

@@ -10,6 +10,9 @@ test("integration", async t => {
     },
     async goodbye() {
       return "goodbye";
+    },
+    async err() {
+      throw new Error("this was an error");
     }
   };
   const server = await runDefaultServer(methods, 2288);
@@ -22,5 +25,12 @@ test("integration", async t => {
   t.equal(rv, "hello, pete!");
   t.equal(await client.goodbye(), "goodbye");
 
+  try {
+    await client.err();
+    t.fail();
+  } catch (e) {
+    t.equal(e.message, "Error: this was an error");
+  }
+
   server.close();
 });

src/rpc-client.ts

@@ -39,7 +39,7 @@ export default function createRpcClient<T extends RpcMethods>(
           invariant(responseJson.jsonrpc === "2.0", "invalid jsonrpc version");
           invariant(responseJson.id === id, "invalid response id");
           if (responseJson.error) {
-            throw new Error(responseJson.message);
+            throw new Error(responseJson.error.message);
           }
           return responseJson.result;
         };