fix: Log compiler errors in js config files

Before this change javascript config files that had compilation errors or that threw their own errors wouldn't report the error, making debugging a mite more difficult than it should be: instead you'd get a useless "TypeError: Cannot read property 'errors' of undefined" message.  Now if the javascript config file tosses its cookies for whatever reason we can read what that reason was.

lib/index.js

@@ -126,19 +126,29 @@ module.exports = async function lintStaged(
       printTaskOutput(ctx, logger)
       return true
     } catch (runAllError) {
-      const { ctx } = runAllError
-      if (ctx.errors.has(ApplyEmptyCommitError)) {
-        logger.warn(PREVENTED_EMPTY_COMMIT)
-      } else if (ctx.errors.has(GitError) && !ctx.errors.has(GetBackupStashError)) {
-        logger.error(GIT_ERROR)
-        if (ctx.shouldBackup) {
-          // No sense to show this if the backup stash itself is missing.
-          logger.error(RESTORE_STASH_EXAMPLE)
+      if (
+        'ctx' in runAllError &&
+        runAllError.ctx &&
+        'errors' in runAllError.ctx &&
+        runAllError.ctx.errors
+      ) {
+        const { ctx } = runAllError
+        if (ctx.errors.has(ApplyEmptyCommitError)) {
+          logger.warn(PREVENTED_EMPTY_COMMIT)
+        } else if (ctx.errors.has(GitError) && !ctx.errors.has(GetBackupStashError)) {
+          logger.error(GIT_ERROR)
+          if (ctx.shouldBackup) {
+            // No sense to show this if the backup stash itself is missing.
+            logger.error(RESTORE_STASH_EXAMPLE)
+          }
         }
+
+        printTaskOutput(ctx, logger)
+        return false
       }
 
-      printTaskOutput(ctx, logger)
-      return false
+      // Probably a compilation error in the config js file. Pass it up to the outer error handler for logging.
+      throw runAllError
     }
   } catch (lintStagedError) {
     if (lintStagedError === errConfigNotFound) {