Add cause

Author: ChadKillingsworth

packages/google-closure-compiler/lib/gulp/index.js

@@ -190,8 +190,9 @@ class CompilationStream extends stream.Transform {
         // stdOutData = stdOutData.substr(stdOutData.indexOf('{'));
         try {
           outputFiles = JSON.parse(stdOutData);
-        } catch {
-          cb(new PluginError(this.PLUGIN_NAME_, 'Error parsing json encoded files'));
+        } catch (err) {
+          const encodingError = new Error('Error parsing json encoded files', { cause: err });
+          cb(new PluginError(this.PLUGIN_NAME_, encodingError));
           return;
         }
       }