Vue.js 3.0 Tutorial

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Vue 3.0 Style Guide

Vue 3.0 Global API Treeshaking

In Vue 3, one of the new features is the ability to leverage tree-shaking with the new Global API. Tree-shaking is a build step that omits unused exports in JavaScript files to create a smaller and more optimized bundle.

Tree-shaking is especially beneficial for larger projects where you might not use all of Vue's features. For instance, if your project doesn't use Vue's transition components, they will not be included in the final bundle.

To leverage tree-shaking in Vue 3, you would need to import the features you need explicitly from vue. In Vue 2, we imported Vue like this:

import Vue from 'vue'

And then we had access to the entire Vue API. But with Vue 3, we can import features individually:

import { createApp, ref } from 'vue'

const app = createApp({
  setup() {
    const count = ref(0)
    
    return {
      count
    }
  }
})

app.mount('#app')

In the example above, we only import the createApp and ref functions from Vue, so those are the only parts of Vue that will be included in our final bundle. This allows for a lighter, more performant application.

In order to use tree-shaking effectively, you'll need to ensure your project is set up with a module bundler that supports tree-shaking such as Webpack or Rollup. Most Vue CLI 3+ projects are configured with Webpack out of the box and can support tree-shaking.

Please note that tree-shaking can result in significant improvements to load time for larger applications with many components, but for smaller applications, the impact might be negligible. It's also worth noting that if you're using features from a library indirectly (e.g., via another library), tree-shaking might not work as expected, since the module bundler may not be able to determine that these features are not being used.

Vue 3.0 Optimizing Bundle Size with Global API Tree Shaking:

Leverage tree shaking to remove unused Global API features and minimize the bundle size.

// main.js
import { createApp } from 'vue';
import App from './App.vue';

const app = createApp(App);

// Tree shakeable Global API features
app.config.globalProperties.$myUtility = () => {
  return 'Tree shakeable utility';
};

app.mount('#app');

<!-- App.vue -->
<template>
  <div>{{ $myUtility() }}</div>
</template>

<script>
export default {
  mounted() {
    // Tree shakeable usage
    console.log(this.$myUtility());
  },
};
</script>

Vue 3.0 Tree-Shakable Global API Features:

Design Global API features with tree shaking in mind, making them easily removable if unused.

// main.js
import { createApp } from 'vue';
import App from './App.vue';

const app = createApp(App);

// Tree shakeable Global API features
app.config.globalProperties.$featureA = () => {
  return 'Tree shakeable feature A';
};

app.mount('#app');

<!-- App.vue -->
<template>
  <div>{{ $featureA() }}</div>
</template>

<script>
export default {
  mounted() {
    // Tree shakeable usage
    console.log(this.$featureA());
  },
};
</script>

Vue 3.0 Reducing Unused Global API Methods in Production:

Employ production-specific configurations to further reduce unused Global API methods.

// main.js
import { createApp } from 'vue';
import App from './App.vue';

const app = createApp(App);

if (process.env.NODE_ENV === 'production') {
  // Remove unnecessary Global API methods in production
  delete app.config.globalProperties.$unusedMethod;
}

app.mount('#app');

Vue 3.0 Webpack Tree Shaking for Global API:
- Enable Webpack tree shaking to eliminate unused Global API methods during the build process.
```
// webpack.config.js
module.exports = {
  // Webpack configuration for tree shaking
  optimization: {
    usedExports: true,
  },
};
```

Vue 3.0 Minimizing Bundle Size with Global API:

Minimize the bundle size by selectively importing and using Global API features.

<!-- App.vue -->
<template>
  <div>{{ $featureB() }}</div>
</template>

<script>
// Import only the necessary Global API feature
import { ref } from 'vue';

export default {
  mounted() {
    // Use the specific Global API feature
    console.log(ref());
  },
};
</script>

Vue 3.0 Tree-Shakable Vue.config.globalProperties:

Define tree-shakable properties in Vue.config.globalProperties to ensure they can be eliminated if unused.

// main.js
import { createApp } from 'vue';
import App from './App.vue';

const app = createApp(App);

// Tree shakeable global properties
app.config.globalProperties.$myUtility = () => {
  return 'Tree shakeable utility';
};

app.mount('#app');

Vue 3.0 Removing Unnecessary Global API Methods:

Remove unnecessary Global API methods to reduce the overall size of the application.

// main.js
import { createApp } from 'vue';
import App from './App.vue';

const app = createApp(App);

// Remove unnecessary Global API methods
delete app.config.globalProperties.$unusedMethod;

app.mount('#app');

Vue 3.0 Global API and Dead Code Elimination:

Leverage dead code elimination to eliminate unused portions of the Global API during the build process.

// webpack.config.js
module.exports = {
  // Webpack configuration for dead code elimination
  optimization: {
    concatenateModules: true,
  },
};