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node_modules/webpack/lib/NoModeWarning.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const WebpackError = require("./WebpackError");
+
+module.exports = class NoModeWarning extends WebpackError {
+	constructor() {
+		super();
+
+		this.name = "NoModeWarning";
+		this.message =
+			"configuration\n" +
+			"The 'mode' option has not been set, webpack will fallback to 'production' for this value.\n" +
+			"Set 'mode' option to 'development' or 'production' to enable defaults for each environment.\n" +
+			"You can also set it to 'none' to disable any default behavior. " +
+			"Learn more: https://webpack.js.org/configuration/mode/";
+	}
+};