optimize logic

Author: eggplantzzz

packages/core/lib/console.js

@@ -264,16 +264,18 @@ class Console extends EventEmitter {
         );
         const json = JSON.parse(body);
         const metadata = JSON.parse(json.metadata);
+        const sources = Object.keys(metadata.sources);
         // filter out Truffle's console.log. We don't want users to interact with in the REPL.
         // user contracts named console.log will be imported, and a warning will be issued.
         if (
-          !Object.keys(metadata.sources).some(source => {
-            return (
-              source === "truffle/console.sol" ||
-              source === "truffle/Console.sol"
-            );
-          }) &&
-          Object.keys(metadata.sources).length === 1
+          sources.length > 1 ||
+          (sources.length === 1 &&
+            !sources.some(source => {
+              return (
+                source === "truffle/console.sol" ||
+                source === "truffle/Console.sol"
+              );
+            }))
         ) {
           jsonBlobs.push(json);
         }