webpack.config.d-optimization.js

;+function () {
    // noinspection JSUnresolvedFunction,NpmUsedModulesInstalled
    const TerserPlugin = require('terser-webpack-plugin')

    // noinspection JSUnresolvedVariable
    if (config.mode === 'production') {
        // noinspection JSUnresolvedVariable,SpellCheckingInspection,JSUnusedGlobalSymbols
        config.optimization = {
            minimize: true,
            minimizer: [
                new TerserPlugin({
                    terserOptions: {
                        // ecma: "2016", // doesn't work with hack in fluid-css: js("Stylis = Stylis.default")
                        compress: {
                            keep_fargs: false,
                            negate_iife: false,
                            passes: 5, // 4 was highest number observed to date that results in even smaller code
                            pure_funcs(node) {
                                // noinspection JSUnresolvedVariable
                                return ![
                                    'isObject',
                                    'KClass',
                                    'KClassImpl',
                                    'KClassifier',
                                    'Unit',
                                    'Unit_getInstance',
                                    'getKPropMetadata',
                                    'getPropertyCallableRef',
                                    'getPropertyRefClass',
                                    'propertyRefClassMetadataCache$init$'
                                ].includes(node.expression.name)
                            },
                            pure_getters: true,
                            unsafe: true,
                            unsafe_arrows: true,
                            unsafe_methods: true,
                            unsafe_proto: true,
                            unsafe_symbols: true,
                        },
                        format: {
                            beautify: false, // for debugging
                            wrap_func_args: false,
                            wrap_iife: true,
                        },
                        mangle: {
                            keep_classnames: false, // for debugging
                            keep_fnames: false, // for debugging
                        },
                    },
                }),
            ],
            splitChunks: {
                cacheGroups: {
                    vendors: false,
                },
            },
        }

        // noinspection SpellCheckingInspection,JSUnresolvedVariable
        config.output.chunkFilename = `assets/[chunkhash].js`
    }
}()