Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/webpack/lib/performance/EntrypointsOverSizeLimitWarning.js

@@ -0,0 +1,35 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Sean Larkin @thelarkinn
+*/
+
+"use strict";
+
+const { formatSize } = require("../SizeFormatHelpers");
+const WebpackError = require("../WebpackError");
+
+/** @typedef {import("./SizeLimitsPlugin").EntrypointDetails} EntrypointDetails */
+
+module.exports = class EntrypointsOverSizeLimitWarning extends WebpackError {
+	/**
+	 * @param {EntrypointDetails[]} entrypoints the entrypoints
+	 * @param {number} entrypointLimit the size limit
+	 */
+	constructor(entrypoints, entrypointLimit) {
+		const entrypointList = entrypoints
+			.map(
+				(entrypoint) =>
+					`\n  ${entrypoint.name} (${formatSize(
+						entrypoint.size
+					)})\n${entrypoint.files.map((asset) => `      ${asset}`).join("\n")}`
+			)
+			.join("");
+		super(`entrypoint size limit: The following entrypoint(s) combined asset size exceeds the recommended limit (${formatSize(
+			entrypointLimit
+		)}). This can impact web performance.
+Entrypoints:${entrypointList}\n`);
+
+		this.name = "EntrypointsOverSizeLimitWarning";
+		this.entrypoints = entrypoints;
+	}
+};