build(webpack): make sure we're not bundling same deps twice

As versions of libraries that are both used by swagger-js and swagger-ui
may diverge in time, we must use webpack resolve aliases to make sure
that only one version of these libraries gets bundled.

webpack/bundle.babel.js

@@ -2,6 +2,8 @@
  * @prettier
  */
 
+import path from "path"
+
 import configBuilder from "./_config-builder"
 
 const result = configBuilder(
@@ -22,6 +24,14 @@ const result = configBuilder(
     output: {
       library: "SwaggerUIBundle",
     },
+    resolve: {
+      // these aliases make sure that we don't bundle same libraries twice
+      // when the versions of these libraries diverge between swagger-js and swagger-ui
+      alias: {
+        "@babel/runtime-corejs2": path.resolve(__dirname, '..', 'node_modules/@babel/runtime-corejs2'),
+        "js-yaml": path.resolve(__dirname, '..', 'node_modules/js-yaml')
+      },
+    },
   }
 )