vue-runtime-helpers

/* This example is conceptual and demonstrates the *purpose* of vue-runtime-helpers. In a real Vue project, these helpers are used internally by build tools (e.g., Vite, Vue CLI) to process Single File Components (SFCs) and are NOT typically imported or called directly by application developers. These functions normalize component options and inject styles behind the scenes. */ // Imagine these are internal exports from vue-runtime-helpers // In a real build environment, they would be imported by a plugin like @vitejs/plugin-vue import { normalizeComponent, createInjector } from 'vue-runtime-helpers'; // Correct import path for tooling // A raw component definition, as it might be parsed from a .vue file's <script> block. // This is an oversimplification; actual SFC compilation is more complex. const rawComponentOptions = { name: 'HelloWorld', props: { msg: String, }, data() { return { count: 0 }; }, methods: { increment() { this.count++; }, }, template: '<div><h1>{{ msg }}</h1><button @click="increment">Count: {{ count }}</button></div>', // Styles extracted from the <style> block of an SFC styles: ['h1 { color: #42b983; } button { background-color: #eee; border: 1px solid #ccc; padding: 5px 10px; cursor: pointer; }'] }; // 1. Conceptual usage of normalizeComponent: // This function takes raw component options and normalizes them into a format // that the Vue runtime expects. It handles various transformations and optimizations. // The parameters are simplified here; actual usage in tooling is more involved. const normalizedComponent = normalizeComponent( rawComponentOptions, () => { /* Render function would be compiled here */ }, [], // scopeId for scoped CSS false, // isSsr null, // shadowMode null, // createInjector (often passed recursively or handled externally) null, // i18n true, // isProd null // globals ); console.log('--- Conceptual normalizeComponent Output ---'); console.log('Normalized component exports (simplified):', normalizedComponent.exports); console.log('Component name:', normalizedComponent.exports.name); console.log('Component props:', normalizedComponent.exports.props); // 2. Conceptual usage of createInjector (for injecting styles): // This function typically returns an object with methods to add or remove styles. // Build tools use this to apply component-specific styles to the DOM or Shadow DOM. const styleInjector = createInjector({}); // Configuration might be passed here console.log('\n--- Conceptual createInjector Output ---'); const stylesToInject = rawComponentOptions.styles; if (stylesToInject && stylesToInject.length > 0) { console.log('Styles prepared for injection:', stylesToInject); // In a real scenario, styleInjector would manage the <style> tags. // For instance, it might append them to the document head or a shadow root, // ensuring they are correctly scoped if needed. console.log('// Style injector would apply these styles to the document or shadow DOM.'); } // To reiterate, typical Vue application development does not involve these helpers directly. // You would write a .vue file, and your build setup (Vite, Vue CLI) would use these internal // utilities to turn your SFC into runnable JavaScript and CSS. // Example of how an end-user writes a component: /* <template> <div> <h1>{{ msg }}</h1> <button @click="increment">Count: {{ count }}</button> </div> </template> <script setup lang="ts"> import { ref } from 'vue'; defineProps<{ msg: string }>(); const count = ref(0); const increment = () => { count.value++; }; </script> <style scoped> h1 { color: #42b983; } button { background-color: #eee; border: 1px solid #ccc; padding: 5px 10px; cursor: pointer; } </style> */