Bud Build Chunk Splitting

I’m experiencing issues with the splitChunks option for the bud config. I’m trying to optimise the page speed of our site by splitting the code into several chunks. From what I’ve read in the docs, the splitChunks function should take any webpack split chunks config. However, given the config below, the code is only split up into a single (and large) vendor file and a single app.js file. If I look at the webpack config, it should have split them up into several chunks each but nothing seems to happen. I’ve tried various other config options but all to no avail.

Could anyone give me a hand and let me know what I’m missing?

This is the bud config:

module.exports = async (app) => {
    app
        .entry({
            app: ['@scripts/main', '@styles/app'],
            editor: ['@scripts/editor', '@styles/editor'],
        })
        /* assets, watch, proxy and serve here */
        .splitChunks({
            chunks: 'async',
            minSize: 20000,
            minRemainingSize: 0,
            minChunks: 1,
            maxAsyncRequests: 30,
            maxInitialRequests: 30,
            enforceSizeThreshold: 50000,
            cacheGroups: {
                defaultVendors: {
                    test: /[\\/]node_modules[\\/]/,
                    priority: -10,
                    reuseExistingChunk: true,
                },
                default: {
                    minChunks: 2,
                    priority: -20,
                    reuseExistingChunk: true,
                },
            },
        })
        .hooks.async('build.resolve.alias', async (aliases) => ({
            ...(aliases ?? {}),
            vue: 'vue/dist/vue.esm-bundler.js',
        }));
};


The build output of running bud build --clean --mode production

┌ assets ─────────────────────────────────────────────────────────────────────────────────────┐
│                                                                                                                                                                   │
│                                                                                                                                                                   │
│  ⚡    vendor/app    vendor/app.8f1456.js                   490.61 kB                                                                                             │
│        app           app.480c57.css                         139.23 kB                                                                                             │
│  ⚡    app           app.11a9b7.js                          106.08 kB                                                                                             │
│  ⚡    editor        editor.1054b3.js                       3.52 kB                                                                                               │
│        runtime       runtime.c8bd56.js                      1.51 kB                                                                                               │
│        editor        editor.31d6cf.css                      0 bytes                                                                                               │
│        ᠃             resources/fonts/HelveticaNeue.woff     46.53 kB                                                                                              │
│        ᠃             resources/fonts/HelveticaNeue.woff2    32.72 kB                                                                                              │
│        ᠃             resources/fonts/akira.woff             9.1 kB                                                                                                │
│        ᠃             manifest.json                          395 bytes                                                                                             │
│  ✔     ᠃             entrypoints.json                       185 bytes                                                                                             │
│  ✔     ᠃             wordpress.json                         33 bytes                                                                                              │
│                                                                                                                                                                   │
│                                                                                                                                                                   │
└──────────────────────────────────────────────────────────────────────────────────────────┘