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node_modules/webpack/lib/OptionsDefaulter.js

@@ -4,24 +4,25 @@
 */
 "use strict";
 
-function getProperty(obj, name) {
+const getProperty = (obj, name) => {
 	name = name.split(".");
-	for(let i = 0; i < name.length - 1; i++) {
+	for (let i = 0; i < name.length - 1; i++) {
 		obj = obj[name[i]];
-		if(typeof obj !== "object" || !obj) return;
+		if (typeof obj !== "object" || !obj || Array.isArray(obj)) return;
 	}
 	return obj[name.pop()];
-}
+};
 
-function setProperty(obj, name, value) {
+const setProperty = (obj, name, value) => {
 	name = name.split(".");
-	for(let i = 0; i < name.length - 1; i++) {
-		if(typeof obj[name[i]] !== "object" && typeof obj[name[i]] !== "undefined") return;
-		if(!obj[name[i]]) obj[name[i]] = {};
+	for (let i = 0; i < name.length - 1; i++) {
+		if (typeof obj[name[i]] !== "object" && obj[name[i]] !== undefined) return;
+		if (Array.isArray(obj[name[i]])) return;
+		if (!obj[name[i]]) obj[name[i]] = {};
 		obj = obj[name[i]];
 	}
 	obj[name.pop()] = value;
-}
+};
 
 class OptionsDefaulter {
 	constructor() {
@@ -30,37 +31,46 @@ class OptionsDefaulter {
 	}
 
 	process(options) {
-		// TODO: change this for webpack 4: options = Object.assign({}, options);
-		for(let name in this.defaults) {
-			switch(this.config[name]) {
+		options = Object.assign({}, options);
+		for (let name in this.defaults) {
+			switch (this.config[name]) {
 				case undefined:
-					if(getProperty(options, name) === undefined)
+					if (getProperty(options, name) === undefined) {
 						setProperty(options, name, this.defaults[name]);
+					}
 					break;
 				case "call":
-					setProperty(options, name, this.defaults[name].call(this, getProperty(options, name), options), options);
+					setProperty(
+						options,
+						name,
+						this.defaults[name].call(this, getProperty(options, name), options)
+					);
 					break;
 				case "make":
-					if(getProperty(options, name) === undefined)
-						setProperty(options, name, this.defaults[name].call(this, options), options);
-					break;
-				case "append":
-					{
-						let oldValue = getProperty(options, name);
-						if(!Array.isArray(oldValue)) oldValue = [];
-						oldValue.push.apply(oldValue, this.defaults[name]);
-						setProperty(options, name, oldValue);
-						break;
+					if (getProperty(options, name) === undefined) {
+						setProperty(options, name, this.defaults[name].call(this, options));
 					}
+					break;
+				case "append": {
+					let oldValue = getProperty(options, name);
+					if (!Array.isArray(oldValue)) {
+						oldValue = [];
+					}
+					oldValue.push(...this.defaults[name]);
+					setProperty(options, name, oldValue);
+					break;
+				}
 				default:
-					throw new Error("OptionsDefaulter cannot process " + this.config[name]);
+					throw new Error(
+						"OptionsDefaulter cannot process " + this.config[name]
+					);
 			}
 		}
-		// TODO: change this for webpack 4: return options;
+		return options;
 	}
 
 	set(name, config, def) {
-		if(arguments.length === 3) {
+		if (def !== undefined) {
 			this.defaults[name] = def;
 			this.config[name] = config;
 		} else {