STRWEB-124 extract sourcemaps from pre-transpiled packages

Extract sourcemaps from pre-transpiled packages. This was unnecessary
previously because stripes-webpack was responsible for both
transpilation and bundling of all `@folio`-scoped packages in a
platform. Now, some packages are transpiled on publish, so we need this
change to consume their sourcemaps.

We may want to set include/exclude rules to only include sourcemaps for
packages scoped to `@folio`.

Refs STRWEB-124

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 5.3.0 IN PROGRESS
 
 * Remove unused `babel-plugin-remove-jsx-attributes`. Refs STRWEB-120.
+* Webpack: extract sourcemaps from transpiled packages. Refs STRWEB-124.
 
 ## [5.2.0](https://github.com/folio-org/stripes-webpack/tree/v5.2.0) (2024-10-09)
 [Full Changelog](https://github.com/folio-org/stripes-webpack/compare/v5.1.0...v5.2.0)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@folio/stripes-webpack",
-  "version": "5.3.0",
+  "version": "5.3.1",
   "description": "The webpack config for stripes",
   "license": "Apache-2.0",
   "publishConfig": {

webpack.config.base.js

@@ -102,6 +102,11 @@ const baseConfig = {
           loader: 'csv-loader',
         }],
       },
+      {
+        test: /\.js$/,
+        enforce: 'pre',
+        use: ['source-map-loader'],
+      },
       {
         test: /\.js.map$/,
         enforce: 'pre',