renaming async to asyncFlag

lib/EntryModuleNotFoundError.js

@@ -8,12 +8,13 @@ class EntryModuleNotFoundError extends Error {
 	constructor(err) {
 		super();
 
+		this.name = "EntryModuleNotFoundError";
+		this.message = "Entry module not found: " + err;
+
 		if(Error.hasOwnProperty("captureStackTrace")) {
 			Error.captureStackTrace(this, this.constructor);
 		}
 
-		this.name = "EntryModuleNotFoundError";
-		this.message = "Entry module not found: " + err;
 		this.details = err.details;
 		this.error = err;
 	}

lib/ExternalModuleFactoryPlugin.js

@@ -40,13 +40,13 @@ class ExternalModuleFactoryPlugin {
 					}
 				} else if(Array.isArray(externals)) {
 					let i = 0;
-					let async;
 					(function next() {
+						let asyncFlag;
 						const handleExternalsAndCallback = function handleExternalsAndCallback(err, module) {
 							if(err) return callback(err);
 							if(!module) {
-								if(async) {
-									async = false;
+								if(asyncFlag) {
+									asyncFlag = false;
 									return;
 								}
 								return next();
@@ -55,11 +55,11 @@ class ExternalModuleFactoryPlugin {
 						};
 
 						do {
-							async = true;
+							asyncFlag = true;
 							if(i >= externals.length) return callback();
 							handleExternals(externals[i++], handleExternalsAndCallback);
-						} while (!async); // eslint-disable-line keyword-spacing
-						async = false;
+						} while (!asyncFlag); // eslint-disable-line keyword-spacing
+						asyncFlag = false;
 					}());
 					return;
 				} else if(externals instanceof RegExp) {