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node_modules/@vue/cli-service/lib/config/prod.js

@@ -0,0 +1,15 @@
+/** @type {import('@vue/cli-service').ServicePlugin} */
+module.exports = (api, options) => {
+  api.chainWebpack(webpackConfig => {
+    if (process.env.NODE_ENV === 'production') {
+      webpackConfig
+        .mode('production')
+        .devtool(options.productionSourceMap ? 'source-map' : false)
+
+      // disable optimization during tests to speed things up
+      if (process.env.VUE_CLI_TEST && !process.env.VUE_CLI_TEST_MINIMIZE) {
+        webpackConfig.optimization.minimize(false)
+      }
+    }
+  })
+}