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node_modules/webpack/lib/EnvironmentPlugin.js

@@ -5,25 +5,33 @@
 
 "use strict";
 
+/** @typedef {import("./Compiler")} Compiler */
+
+const WebpackError = require("./WebpackError");
 const DefinePlugin = require("./DefinePlugin");
 
-const needsEnvVarFix = ["8", "9"].indexOf(process.versions.node.split(".")[0]) >= 0 &&
+const needsEnvVarFix =
+	["8", "9"].indexOf(process.versions.node.split(".")[0]) >= 0 &&
 	process.platform === "win32";
 
 class EnvironmentPlugin {
-	constructor(keys) {
-		if(Array.isArray(keys)) {
-			this.keys = keys;
+	constructor(...keys) {
+		if (keys.length === 1 && Array.isArray(keys[0])) {
+			this.keys = keys[0];
 			this.defaultValues = {};
-		} else if(keys && typeof keys === "object") {
-			this.keys = Object.keys(keys);
-			this.defaultValues = keys;
+		} else if (keys.length === 1 && keys[0] && typeof keys[0] === "object") {
+			this.keys = Object.keys(keys[0]);
+			this.defaultValues = keys[0];
 		} else {
-			this.keys = Array.prototype.slice.call(arguments);
+			this.keys = keys;
 			this.defaultValues = {};
 		}
 	}
 
+	/**
+	 * @param {Compiler} compiler webpack compiler instance
+	 * @returns {void}
+	 */
 	apply(compiler) {
 		const definitions = this.keys.reduce((defs, key) => {
 			// TODO remove once the fix has made its way into Node 8.
@@ -31,16 +39,19 @@ class EnvironmentPlugin {
 			// affecting Node 8 & 9 by performing an OS-level
 			// operation that always succeeds before reading
 			// environment variables:
-			if(needsEnvVarFix) require("os").cpus();
+			if (needsEnvVarFix) require("os").cpus();
 
-			const value = process.env[key] !== undefined ? process.env[key] : this.defaultValues[key];
+			const value =
+				process.env[key] !== undefined
+					? process.env[key]
+					: this.defaultValues[key];
 
-			if(value === undefined) {
-				compiler.plugin("this-compilation", compilation => {
-					const error = new Error(
+			if (value === undefined) {
+				compiler.hooks.thisCompilation.tap("EnvironmentPlugin", compilation => {
+					const error = new WebpackError(
 						`EnvironmentPlugin - ${key} environment variable is undefined.\n\n` +
-						"You can pass an object with default values to suppress this warning.\n" +
-						"See https://webpack.js.org/plugins/environment-plugin for example."
+							"You can pass an object with default values to suppress this warning.\n" +
+							"See https://webpack.js.org/plugins/environment-plugin for example."
 					);
 
 					error.name = "EnvVariableNotDefinedError";
@@ -48,12 +59,13 @@ class EnvironmentPlugin {
 				});
 			}
 
-			defs[`process.env.${key}`] = typeof value === "undefined" ? "undefined" : JSON.stringify(value);
+			defs[`process.env.${key}`] =
+				value === undefined ? "undefined" : JSON.stringify(value);
 
 			return defs;
 		}, {});
 
-		compiler.apply(new DefinePlugin(definitions));
+		new DefinePlugin(definitions).apply(compiler);
 	}
 }