add example regex match for stdout/err string

src/exec_wrapper.ts

@@ -30,18 +30,32 @@ export async function exec_wrapper(commandLine: string, args?: string[], options
     }
   };
 
-  const returnCode = await exec.exec(
-    commandLine,
-    args,
-    {
-      listeners: listeners,
-      ...options
-    });
+  let returnCode: number;
+  try {
+    returnCode = await exec.exec(
+      commandLine,
+      args,
+      {
+        listeners: listeners,
+        ...options
+      });
+  } catch (e) {
+    returnCode = 1;
+  }
+  if (returnCode === 0) {
+    throw new Error('The exit code was ' + returnCode + '?!');
+  }
 
-  if (stderr === stdout ) {
-    console.log('foo bar');
+  const regex = new RegExp("(No source code was seen during the build\\.|No JavaScript or TypeScript code found\\.)");
+
+  if (regex.test(stderr) || regex.test(stdout) ) {
+    throw new Error(`No source code was found. This can occur if the specified build commands failed to compile or process any code.
+    - Confirm that there is some source code for the specified language in the project.
+    - For codebases written in Go, JavaScript, TypeScript, and Python, do not specify
+      an explicit --command.
+    - For other languages, the --command must specify a "clean" build which compiles
+    https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning`);
   }
 
   return returnCode;
-
 }