fix: umd build so it can be used in browser (#7349)

* fix: umd build so it can be used in browser

* fix lint

* increase size limit

* update changelog

* use json.stringify for env preact variable so its accessible as string

* update changelog

dev-docs/docs/@excalidraw/excalidraw/faq.mdx

@@ -39,7 +39,7 @@ Since Vite removes env variables by default, you can update the vite config to e
 
 ```
  define: {
-    "process.env.IS_PREACT": process.env.IS_PREACT,
+    "process.env.IS_PREACT": JSON.stringify("true"),
   },
 ```
 

dev-docs/docs/@excalidraw/excalidraw/integration.mdx

@@ -93,7 +93,7 @@ Since Vite removes env variables by default, you can update the vite config to e
 
 ```
  define: {
-    "process.env.IS_PREACT": process.env.IS_PREACT,
+    "process.env.IS_PREACT": JSON.stringify("true"),
   },
 ```
 ::: 

src/packages/excalidraw/.size-limit.json

@@ -1,7 +1,7 @@
 [
   {
     "path": "dist/excalidraw.production.min.js",
-    "limit": "325 kB"
+    "limit": "335 kB"
   },
   {
     "path": "dist/excalidraw-assets/locales",

src/packages/excalidraw/CHANGELOG.md

@@ -13,6 +13,16 @@ Please add the latest change on the top under the correct section.
 
 ## Unreleased
 
+### Fixes
+
+- Umd build for browser since it was breaking in v0.17.0 [#7349](https://github.com/excalidraw/excalidraw/pull/7349). Also make sure that when using `Vite`, the `process.env.IS_PREACT` is set as `"true"` (string) and not a boolean.
+
+```
+define: {
+  "process.env.IS_PREACT": JSON.stringify("true"),
+}
+```
+
 ### Breaking Changes
 
 - `appState.openDialog` type was changed from `null | string` to `null | { name: string }`. [#7336](https://github.com/excalidraw/excalidraw/pull/7336)

src/packages/excalidraw/webpack.preact.config.js

@@ -1,5 +1,3 @@
-const { merge } = require("webpack-merge");
-
 const prodConfig = require("./webpack.prod.config");
 const devConfig = require("./webpack.dev.config");
 
@@ -11,6 +9,7 @@ const outputFile = isProd
   : "excalidraw-with-preact.development";
 
 const preactWebpackConfig = {
+  ...config,
   entry: {
     [outputFile]: "./entry.js",
   },
@@ -30,4 +29,4 @@ const preactWebpackConfig = {
     },
   },
 };
-module.exports = merge(config, preactWebpackConfig);
+module.exports = preactWebpackConfig;