Move concurrent compilation error to separate class

acupofspirt · acupofspirt · commit ea6e17355133 · 2018-03-13T13:10:42.000+03:00
diff --git a/lib/Compiler.js b/lib/Compiler.js
@@ -22,6 +22,7 @@ const ResolverFactory = require("./ResolverFactory");
 
 const RequestShortener = require("./RequestShortener");
 const makePathsRelative = require("./util/identifier").makePathsRelative;
+const ConcurrentCompilationError = require("./ConcurrentCompilationError");
 
 class Compiler extends Tapable {
 	constructor(context) {
@@ -134,12 +135,7 @@ class Compiler extends Tapable {
 	}
 
 	watch(watchOptions, handler) {
-		if (this.running)
-			return handler(
-				new Error(
-					"You ran Webpack twice. Each instance only supports a single concurrent compilation at a time."
-				)
-			);
+		if (this.running) return handler(new ConcurrentCompilationError());
 
 		this.running = true;
 		this.fileTimestamps = new Map();
@@ -148,12 +144,7 @@ class Compiler extends Tapable {
 	}
 
 	run(callback) {
-		if (this.running)
-			return callback(
-				new Error(
-					"You ran Webpack twice. Each instance only supports a single concurrent compilation at a time."
-				)
-			);
+		if (this.running) return callback(new ConcurrentCompilationError());
 
 		const finalCallback = (err, stats) => {
 			this.running = false;
diff --git a/lib/ConcurrentCompilationError.js b/lib/ConcurrentCompilationError.js
@@ -0,0 +1,19 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Maksim Nazarjev @acupofspirt
+*/
+"use strict";
+
+const WebpackError = require("./WebpackError");
+
+module.exports = class ConcurrentCompilationError extends WebpackError {
+	constructor() {
+		super();
+
+		this.name = "ConcurrentCompilationError";
+		this.message =
+			"You ran Webpack twice. Each instance only supports a single concurrent compilation at a time.";
+
+		Error.captureStackTrace(this, this.constructor);
+	}
+};
diff --git a/lib/MultiCompiler.js b/lib/MultiCompiler.js
@@ -10,6 +10,7 @@ const MultiHook = require("tapable").MultiHook;
 const asyncLib = require("neo-async");
 const MultiWatching = require("./MultiWatching");
 const MultiStats = require("./MultiStats");
+const ConcurrentCompilationError = require("./ConcurrentCompilationError");
 
 module.exports = class MultiCompiler extends Tapable {
 	constructor(compilers) {
@@ -186,12 +187,7 @@ module.exports = class MultiCompiler extends Tapable {
 	}
 
 	watch(watchOptions, handler) {
-		if (this.running)
-			return handler(
-				new Error(
-					"You ran Webpack twice. Each instance only supports a single concurrent compilation at a time."
-				)
-			);
+		if (this.running) return handler(new ConcurrentCompilationError());
 
 		const finalHandler = (err, stats) => {
 			this.running = false;
@@ -245,12 +241,7 @@ module.exports = class MultiCompiler extends Tapable {
 	}
 
 	run(callback) {
-		if (this.running)
-			return callback(
-				new Error(
-					"You ran Webpack twice. Each instance only supports a single concurrent compilation at a time."
-				)
-			);
+		if (this.running) return callback(new ConcurrentCompilationError());
 
 		const finalCallback = (err, stats) => {
 			this.running = false;
