fix webpack config

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

@@ -41,6 +41,14 @@ module.exports = {
           "sass-loader",
         ],
       },
+      // So that type module works with webpack
+      // https://github.com/webpack/webpack/issues/11467#issuecomment-691873586
+      {
+        test: /\.m?js/,
+        resolve: {
+          fullySpecified: false,
+        },
+      },
       {
         test: /\.(ts|tsx|js|jsx|mjs)$/,
         exclude:

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

@@ -44,6 +44,14 @@ module.exports = {
           "sass-loader",
         ],
       },
+      // So that type module works with webpack
+      // https://github.com/webpack/webpack/issues/11467#issuecomment-691873586
+      {
+        test: /\.m?js/,
+        resolve: {
+          fullySpecified: false,
+        },
+      },
       {
         test: /\.(ts|tsx|js|jsx|mjs)$/,
         exclude: