Improve error messages

Author: jdreesen

lib/WebpackConfig.js

@@ -396,7 +396,7 @@ class WebpackConfig {
             }
 
             if (this.doesBabelRcFileExist()) {
-                logger.warning('The "callback" argument of configureBabel() will not be used because your app already provides an external Babel configuration (a ".babelrc" file, ".babelrc.js" file or "babel" key in "package.json"). Use null as a first argument to remove that warning.');
+                logger.warning('The "callback" argument of configureBabel() will not be used because your app already provides an external Babel configuration (e.g. a ".babelrc" or "babelrc.config.js" file or "babel" key in "package.json"). Use null as a first argument to remove that warning.');
             }
         }
 
@@ -415,7 +415,7 @@ class WebpackConfig {
             }
 
             if (this.doesBabelRcFileExist() && !allowedOptionsWithExternalConfig.includes(normalizedOptionKey)) {
-                logger.warning(`The "${normalizedOptionKey}" option of configureBabel() will not be used because your app already provides an external Babel configuration (a ".babelrc" file, ".babelrc.js" file or "babel" key in "package.json").`);
+                logger.warning(`The "${normalizedOptionKey}" option of configureBabel() will not be used because your app already provides an external Babel configuration (e.g. a ".babelrc" or "babelrc.config.js" file or "babel" key in "package.json").`);
                 continue;
             }
 
@@ -462,7 +462,7 @@ class WebpackConfig {
         }
 
         if (this.doesBabelRcFileExist()) {
-            throw new Error('The "callback" argument of configureBabelPresetEnv() will not be used because your app already provides an external Babel configuration (a ".babelrc" file, ".babelrc.js" file or "babel" key in "package.json").');
+            throw new Error('The "callback" argument of configureBabelPresetEnv() will not be used because your app already provides an external Babel configuration (e.g. a ".babelrc" or "babelrc.config.js" file or "babel" key in "package.json").');
         }
 
         this.babelPresetEnvOptionsCallback = callback;