@danielkelly_io

@danielkellyio

Alabama, USA

Daniel Kelly

Teacher @ Vue School

Full Stack developer (10 years)

Husband and Father

What is Vite?

Next generation front-end tooling that aims to provide a leaner and faster development experience

Current State of Development

Vite to the Rescue

Dev Server Start Times: 259ms

HMR: Essentially instant

Development Server

Browser Support for ES Modules
ESBuild
- TypeScript
- Vue SFC

ESBuild Benchmarks

Production Bundling

Uses Rollup under the hood
Why Rollup?
- build speed
- tree-shaking
- output size

Why Vite

Uses Rollup under the hood
Why Rollup?
- build speed
- tree-shaking
- output size

Vite to the Rescue

Native ES Modules
ESBuild - GO based JS bundler

Vite to the Rescue

Native ES Modules
ESBuild - GO based JS bundler
How Vite Changes the Game for Vue and Web Developers - Alex Kyriakidis

Rapid Development with Vite

Process of Discovery

Create brand new Vue CLI project
Create brand new Vite Project
Compare the differences
Steps will cover 70% - 90%
Don't look at the steps as something to memorize

Process of Discovery

https://vueschool.io/articles/vuejs-tutorials/how-to-migrate-from-vue-cli-to-vite/

Step # 1

Update Dependencies

// package.json

{
  //...
  "dependencies": {
    "core-js": "^3.6.5",
    "vue": "^2.6.11",
    "vue-router": "^3.2.0"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "~4.5.0",
    "@vue/cli-plugin-eslint": "~4.5.0",
    "@vue/cli-plugin-router": "~4.5.0",
    "@vue/cli-service": "~4.5.0",
    "@vue/eslint-config-prettier": "^6.0.0",
    "babel-eslint": "^10.1.0",
    "eslint": "^6.7.2",
    "eslint-plugin-prettier": "^3.3.1",
    "eslint-plugin-vue": "^6.2.2",
    "prettier": "^2.2.1",
    "sass": "^1.26.5",
    "sass-loader": "^8.0.2",
    "vue-template-compiler": "^2.6.11"
  }
}

Step # 1

Update Dependencies

// package.json

{
  //...
  "dependencies": {
    "core-js": "^3.6.5",
    "vue": "^2.6.11",
    "vue-router": "^3.2.0"
  },
  "devDependencies": {
    "@vue/eslint-config-prettier": "^6.0.0",
    "babel-eslint": "^10.1.0",
    "eslint": "^6.7.2",
    "eslint-plugin-prettier": "^3.3.1",
    "eslint-plugin-vue": "^6.2.2",
    "prettier": "^2.2.1",
    "sass": "^1.26.5",
    "sass-loader": "^8.0.2",
    "vue-template-compiler": "^2.6.11"
  }
}

Step # 1

Update Dependencies

// package.json

{
  //...
  "dependencies": {
    "core-js": "^3.6.5",
    "vue": "^2.6.11",
    "vue-router": "^3.2.0"
  },
  "devDependencies": {
    "@vue/eslint-config-prettier": "^6.0.0",
    "babel-eslint": "^10.1.0",
    "eslint": "^6.7.2",
    "eslint-plugin-prettier": "^3.3.1",
    "eslint-plugin-vue": "^6.2.2",
    "prettier": "^2.2.1",
    "sass": "^1.26.5",
    "vue-template-compiler": "^2.6.11"
  }
}

Step # 1

Update Dependencies

// package.json

{
  //...
  "dependencies": {
    "core-js": "^3.6.5",
    "vue": "^2.6.11",
    "vue-router": "^3.2.0"
  },
  "devDependencies": {
    "@vue/eslint-config-prettier": "^6.0.0",
    "babel-eslint": "^10.1.0",
    "eslint": "^6.7.2",
    "eslint-plugin-prettier": "^3.3.1",
    "eslint-plugin-vue": "^6.2.2",
    "prettier": "^2.2.1",
    "sass": "^1.26.5",
  }
}

Step # 1

Update Dependencies

$ npm i -D vite

Step # 1

Update Dependencies

$ npm i -D vite-plugin-vue2

Step # 1

Update Dependencies

$ npm i -D @vitejs/plugin-vue

Step # 1

Update Dependencies

$ npm prune

Step # 2

Provide Support only For Modern Browsers

https://kangax.github.io/compat-table/es6/

Step # 2

Provide Support only For Modern Browsers

Step # 2

Provide Support only For Modern Browsers

// package.json

{
  //...
  "dependencies": {
    "core-js": "^3.6.5",
    "vue": "^2.6.11",
    "vue-router": "^3.2.0"
  },
  "devDependencies": {
    "babel-eslint": "^10.1.0",
    "eslint": "^6.7.2",
    "eslint-plugin-prettier": "^3.3.1",
    "eslint-plugin-vue": "^6.2.2",
    "prettier": "^2.2.1",
    "sass": "^1.26.5",
  }
}

Step # 2

Provide Support only For Modern Browsers

// package.json

{
  //...
  "dependencies": {
    "vue": "^2.6.11",
    "vue-router": "^3.2.0"
  },
  "devDependencies": {
    "eslint": "^6.7.2",
    "eslint-plugin-prettier": "^3.3.1",
    "eslint-plugin-vue": "^6.2.2",
    "prettier": "^2.2.1",
    "sass": "^1.26.5",
  }
}

Step # 2

Provide Support only For Modern Browsers

// .eslintrc.js
module.exports = {
  root: true,
  env: {
    node: true,
  },
  extends: ["plugin:vue/essential", "eslint:recommended", "@vue/prettier"],
  parserOptions: {
    parser: "babel-eslint",
  },
  rules: {
    "no-console": process.env.NODE_ENV === "production" ? "warn" : "off",
    "no-debugger": process.env.NODE_ENV === "production" ? "warn" : "off",
  },
};

Step # 2

Provide Support only For Modern Browsers

// .eslintrc.js
module.exports = {
  root: true,
  env: {
    node: true,
  },
  extends: ["plugin:vue/essential", "eslint:recommended", "@vue/prettier"],
  rules: {
    "no-console": process.env.NODE_ENV === "production" ? "warn" : "off",
    "no-debugger": process.env.NODE_ENV === "production" ? "warn" : "off",
  },
};

Step # 2

Provide Support only For Modern Browsers

// .eslintrc.js
module.exports = {
  root: true,
  env: {
    node: true,
  },
  extends: ["plugin:vue/essential", "eslint:recommended", "@vue/prettier"],
  rules: {
    "no-console": process.env.NODE_ENV === "production" ? "warn" : "off",
    "no-debugger": process.env.NODE_ENV === "production" ? "warn" : "off",
  },
};

Step # 2

Provide Support only For Modern Browsers

// .eslintrc.js
module.exports = {
  root: true,
  env: {
    node: true,
    es2021: true,
  },
  extends: ["plugin:vue/essential", "eslint:recommended", "@vue/prettier"],
  rules: {
    "no-console": process.env.NODE_ENV === "production" ? "warn" : "off",
    "no-debugger": process.env.NODE_ENV === "production" ? "warn" : "off",
  },
};

Step # 2

Provide Support only For Modern Browsers

$ npm install eslint@8 eslint-plugin-vue@8

Step # 2

Provide Support only For Modern Browsers

$ npm prune

Step # 2

Provide Support only For Modern Browsers

Step # 3

Add Vite Config

// vite.config.js

import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

export default defineConfig({
//https://vitejs.dev/config/
  plugins: [vue()]
})

Step # 3

Add Vite Config

// vite.config.js

import { defineConfig } from 'vite'
import { createVuePlugin as vue } from "vite-plugin-vue2";

export default defineConfig({
//https://vitejs.dev/config/
  plugins: [vue()]
})

Step # 3

Add Vite Config

// vite.config.js

import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
import { fileURLToPath, URL } from 'node:url'

export default defineConfig({
//https://vitejs.dev/config/
  plugins: [vue()],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url))
    }
  }
})

Step # 4

Move the index.html

Step # 4

Move the index.html

<!--index.html-->
<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

Step # 4

Move the index.html

<!--index.html-->
<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

Step # 4

Move the index.html

<!--index.html-->
<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title>Hard Coded Title</title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but this app doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

Step # 4

Move the index.html

<!--index.html-->
<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title>Hard Coded Title</title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but this app doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

Step # 4

Move the index.html

<!--index.html-->
<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="/favicon.ico">
    <title>Hard Coded Title</title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but this app doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

Step # 4

Move the index.html

<!--index.html-->
<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="/favicon.ico">
    <title>Hard Coded Title</title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but this app doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>

Step # 4

Move the index.html

<!--index.html-->
<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link rel="icon" href="/favicon.ico">
    <title>Hard Coded Title</title>
  </head>
  <body>
    <noscript>
      <strong>We're sorry but this app doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
    <div id="app"></div>
    <script type="module" src="/src/main.js"></script>
  </body>
</html>

Step # 5

Update Scripts in package.json

// package.json

{
  //...
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  //...
}

Step # 5

Update Scripts in package.json

// package.json

{
  //...
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "serve": "vite preview",
  },
  //...
}

Step # 5

Update Scripts in package.json

// package.json

{
  //...
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "serve": "vite preview",
    "lint": "eslint --ext .js,.vue --ignore-path .gitignore --fix src"
  },
  //...
}

Step # 6

Update Environment Variables


.env              # loaded in all cases

.env.local        # loaded in all cases, ignored by git

.env.[mode]       # only loaded in specified mode

.env.[mode].local # only loaded in specified mode, ignored by git

Step # 6

Update Environment Variables

// /src/router/index.js

//...
const router = new VueRouter({
  mode: "history",
  base: process.env.BASE_URL,
  routes,
});

Step # 6

Update Environment Variables

// /src/router/index.js

//...
const router = new VueRouter({
  mode: "history",
  base: import.meta.env.BASE_URL,
  routes,
});

Step # 6

Update Environment Variables

// .env

VUE_APP_MY_HEADLESS_CMS_API_KEY=123

Step # 6

Update Environment Variables

// .env

VITE_MY_HEADLESS_CMS_API_KEY=123

Step # 7

Add .vue extension to SFC imports

// Home.vue

// .vue is required
import HelloWorld from "@/components/HelloWorld.vue";

Step # 7

Add .vue extension to SFC imports

// vite.config.js
//...
export default defineConfig({
  plugins: [vue()],
  resolve: {
    extensions: 
    	['.mjs', '.js', '.ts', '.jsx', '.tsx', '.json', '.vue'],
    //...
  },
});

Step # 8

Clean Up Magic Comments

// router/index.js

//...
{
  path: "/about",
  name: "About",
  component: () =>
    import( /* webpackChunkName: "about" */ "../views/About.vue"),
 },

Step # 8

Clean Up Magic Comments

// router/index.js

//...
{
  path: "/about",
  name: "About",
  component: () =>
    import("../views/About.vue"), // About.37a9fa9f.js,
 },

Step # 9

Enjoy an improved developer experience

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@danielkelly_io

@danielkellyio

Alabama, USA

Thank You!

How to Migrate to Vite

By Daniel Kelly

How to Migrate to Vite

2,043