fix: detach mocha from webpack stack

Author: privatenumber

src/instant-mocha.ts

@@ -72,16 +72,17 @@ export default async function instantMocha(
 			}
 
 			/**
-			 * Seems Webpack's watch callback can't be async.
-			 *
 			 * Had issues with Webpackbar and a multi-page test report.
 			 * It wasn't possible to clear the previous report output
 			 * because it seemed like Webpackbar was storing it and
 			 * re-printing.
 			 *
-			 * This method is async but it's fine.
+			 * Running mocha detached from this stack seems to escape
+			 * the stdout caching.
 			 */
-			runMocha(options);
+			setImmediate(() => {
+				runMocha(options);
+			});
 		});
 	} else {
 		await webpackCompiler.$run();