Bundler Polyfill Issues - Svelte with Vite
When developing a new web3 project with Svelte and Vite, you may encounter bundler issues due to
missing polyfills. This commonly occurs with packages like eccrypto
which rely on node modules not
present in the browser environment. Directly adding these modules to your package can solve the
issue but may lead to a larger bundle size, affecting load times and user experience.
It's essential to recognize that the required node polyfills should only be included during development and testing, and the bundler should be instructed to exclude them from the production build.
The following guide provides instructions for adding the necessary polyfills in a Svelte project using Vite.
Install the missing modules
First, identify the missing libraries in your build. For integrating Web3Auth with Svelte, you will
need to polyfill buffer
and process
. For other libraries, use an alternative like the
empty-module
to prevent build warnings.
- npm
- Yarn
- pnpm
- Bun
npm install --save-dev buffer process vite-plugin-node-polyfills
yarn add --dev buffer process vite-plugin-node-polyfills
pnpm add --save-dev buffer process vite-plugin-node-polyfills
bun add --dev buffer process vite-plugin-node-polyfills
You may need to polyfill additional libraries depending on the other blockchain libraries you are using with Web3Auth. Common polyfills include crypto-browserify, stream-browserify, and others listed in the previous guide.
Update your vite.config.js
Modify your Vite configuration to integrate the polyfills with Svelte as follows:
import { sveltekit } from "@sveltejs/kit/vite";
import { defineConfig } from "vitest/config";
import { nodePolyfills } from "vite-plugin-node-polyfills";
export default defineConfig({
plugins: [
nodePolyfills({
exclude: ["fs"],
globals: {
Buffer: true,
global: true,
process: true,
},
protocolImports: true,
}),
sveltekit(),
],
optimizeDeps: {
include: ["dayjs/plugin/relativeTime.js", "dayjs", "@web3auth/ethereum-provider"],
},
test: {
include: ["src/**/*.{test,spec}.{js,ts}"],
},
});
This configuration sets up the necessary aliases and defines globals for the browser environment, ensuring compatibility and reducing bundle size.
Address additional dependency issues
If there are additional dependencies that need to be polyfilled, consider adding them to the include array in the optimizeDeps section of the Vite config. Test your application thoroughly to ensure that all functionalities work as expected after the polyfills are added.
By following these steps, you should be able to resolve bundler polyfill issues in your Svelte and Vite web3 project, leading to a more efficient build and a smoother user experience.
Common Questions
The following questions can be answered using the information on this page:
- How do I fix polyfill issues in a Svelte project with Web3Auth?
- What dependencies are needed for Web3Auth in a Svelte project?
- How do I configure Vite for Web3Auth in Svelte?
- What are the common bundler issues with Svelte and Web3Auth?
- How do I handle missing node modules in Svelte with Web3Auth?
- What polyfills are required for Web3Auth in Svelte?
- How do I optimize dependencies in a Svelte Web3Auth project?
- What should I include in vite.config.js for Web3Auth?
- How do I resolve Buffer and process polyfill issues in Svelte?
- What are the best practices for handling polyfills in Svelte production builds?