chore: Dedupe webpack configs. (#5449)

* chore: Dedupe package dependencies and webpack configs.

* Fully dedupe `src/packages` via symlinks

* Merge https://github.com/excalidraw/excalidraw into dedupe-package-deps-configs

* fix: Link `tsc` so `build:example` works in @excalidraw/excalidraw

* @excalidraw/plugins: Revert the `yarn.lock` deduping.

* Drop yarn commands from the root `package.json`.

* Remove more unneeded `package.json` additions.

* One more change to drop in `package.json` files.

* Deduping: Move even more into common webpack configs.

* renaming

Co-authored-by: Aakansha Doshi <aakansha1216@gmail.com>

src/packages/common.webpack.dev.config.js

@@ -0,0 +1,88 @@
+const path = require("path");
+const autoprefixer = require("autoprefixer");
+const webpack = require("webpack");
+const { parseEnvVariables } = require(path.resolve(global.__childdir, "./env"));
+
+module.exports = {
+  mode: "development",
+  devtool: false,
+  output: {
+    libraryTarget: "umd",
+    filename: "[name].js",
+    publicPath: "",
+  },
+  resolve: {
+    extensions: [".js", ".ts", ".tsx", ".css", ".scss"],
+  },
+  module: {
+    rules: [
+      {
+        test: /\.(sa|sc|c)ss$/,
+        exclude: /node_modules/,
+        use: [
+          "style-loader",
+          { loader: "css-loader" },
+          {
+            loader: "postcss-loader",
+            options: {
+              postcssOptions: {
+                plugins: [autoprefixer()],
+              },
+            },
+          },
+          "sass-loader",
+        ],
+      },
+      {
+        test: /\.(ts|tsx|js|jsx|mjs)$/,
+        exclude: /node_modules\/(?!browser-fs-access)/,
+        use: [
+          {
+            loader: "ts-loader",
+            options: {
+              transpileOnly: true,
+              configFile: path.resolve(__dirname, "./tsconfig.dev.json"),
+            },
+          },
+        ],
+      },
+      {
+        test: /\.(woff|woff2|eot|ttf|otf)$/,
+        type: "asset/resource",
+      },
+    ],
+  },
+  optimization: {
+    splitChunks: {
+      chunks: "async",
+      cacheGroups: {
+        vendors: {
+          test: /[\\/]node_modules[\\/]/,
+          name: "vendor",
+        },
+      },
+    },
+  },
+  plugins: [
+    new webpack.EvalSourceMapDevToolPlugin({ exclude: /vendor/ }),
+    new webpack.DefinePlugin({
+      "process.env": parseEnvVariables(
+        path.resolve(__dirname, "../../.env.development"),
+      ),
+    }),
+  ],
+  externals: {
+    react: {
+      root: "React",
+      commonjs2: "react",
+      commonjs: "react",
+      amd: "react",
+    },
+    "react-dom": {
+      root: "ReactDOM",
+      commonjs2: "react-dom",
+      commonjs: "react-dom",
+      amd: "react-dom",
+    },
+  },
+};