Upgrade Vue — 2.6 To 2.7

// webpack.config.js module.exports = module: rules: [ test: /\.vue$/, loader: 'vue-loader', , ], , plugins: [ new (require('vue-loader')).VueLoaderPlugin(), ], ; If using vue-cli (v4 or v5), no action is needed – it handles the update automatically. Vue 2.7 ships with its own TypeScript declarations. Remove any custom shims-vue.d.ts that redeclare .vue modules.

"compilerOptions": "types": ["vue"]

</script> <script setup> import ref from 'vue' const count = ref(0) </script> <template> <button @click="count++"> count </button> </template> Optional chaining and nullish coalescing <template> <div> user?.address?.city ?? 'Unknown' </div> </template> Reactivity Transform (opt-in) Enable via vue-loader config: upgrade vue 2.6 to 2.7

module.exports = extends: ['plugin:vue/vue3-recommended'], // yes, 'vue3' works for 2.7 ; Most apps work without changes. But be aware of these: 1. v-model on custom components Vue 2.7 aligns with Vue 3’s v-model behavior. Previously, v-model on a component compiled to value + input . Now it compiles to modelValue + update:modelValue . // webpack

- import ref, computed from '@vue/composition-api' + import ref, computed from 'vue' If using vue-loader v15: v-model on custom components Vue 2