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import { defineConfig } from 'vite'

The line import { defineConfig } from 'vite' is a standard import statement used in JavaScript and TypeScript projects that utilize Vite as their build tool.
Purpose:
  • Importing defineConfig:
    This statement imports the defineConfig helper function from the vite package.
  • Providing Intellisense and Type Checking:
    The primary purpose of defineConfig is to provide type hints and better Intellisense support within your IDE when configuring Vite. By wrapping your Vite configuration object with defineConfig, you benefit from autocompletion and type checking, which helps prevent errors and ensures your configuration adheres to Vite's expected structure.
  • Defining Vite Configuration:
    This function is typically used in the vite.config.js (or vite.config.ts) file, which is the central place to define your project's build and development settings for Vite.
Example Usage: 


// vite.config.js
import { defineConfig } from 'vite';

export default defineConfig({
  plugins: [
    // your Vite plugins here, e.g., @vitejs/plugin-react
  ],
  server: {
    port: 3000,
  },
  build: {
    outDir: 'dist',
  },
});
In this example, the configuration object passed to defineConfig specifies various Vite settings, including plugins, server options, and build options. The defineConfig wrapper helps ensure that these settings are correctly typed and recognized by your app.
Key Parameters in defineConfig

  • plugins: Array of Vite plugins (e.g., React, Vue, TS Paths) to add functionality.
  • server: Options for the development server (e.g., port, host, open, proxy).
  • build: Settings for the production build (e.g., outDir, minify, target).
  • resolve: Path aliases (e.g., @/src) and module resolution settings.
  • define: Global constants (e.g., __APP_VERSION__) that get replaced during build.
  • envDir / envPrefix: Control where .env files are loaded and which variables are exposed.
  • base: Public path for assets (e.g., /my-app/). 

Advanced Usage

  • Conditional Config: Export a function from defineConfig to set options based on command (dev/build) or mode (development/production).
  • Rollup Options: Use build.rollupOptions to deeply customize Rollup (e.g., output.entryFileNames, external modules)
development environment.
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