SharePoint Framework (SPFx) is a powerful platform for building client-side web parts and extensions. However, one common challenge developers face is slow build times during development, especially for large projects. Fast-Serve is a helper library that solves this problem by speeding up the build and serve process.

What is Fast-Serve?

Fast-Serve is a development-time optimization tool for SPFx projects. It integrates with the SPFx Gulp build pipeline to:

Essentially, it reduces wait time and improves the developer experience.

Why Use Fast-Serve?

Without Fast-Serve

With Fast-Serve

How to Add Fast-Serve to Your SPFx Project

  1. Install the Fast-Serve Package

npm install spfx-fast-serve-helpers --save-dev

  1. Update gulpfile.js

'use strict';
const build = require('@microsoft/sp-build-web');
// Optional: suppress SASS warnings
build.addSuppression(`Warning - [sass] The local CSS class 'ms-Grid' is not camelCase and will not be type-safe.`);
// Add Fast-Serve
const { addFastServe } = require('spfx-fast-serve-helpers');
addFastServe(build);
// Initialize SPFx build system
build.initialize(require('gulp'));

Fast-Serve will now

  1. Run Gulp Serve

//Start Local Development Server
gulp serve

How Fast-Serve Works Internally

  1. Hooks into Gulp tasks: Wraps SPFx build tasks to detect changes.

  2. File watching: Monitors TypeScript, CSS, SASS, and asset files.

  3. Incremental build: Recompiles only changed files.

  4. Hot reload: Refreshes the browser instantly without restarting the server.

Comparision

FeatureNormal SPFx ServeFast-Serve
Build typeFull rebuildIncremental rebuild
Server restartMay happenNot required
Browsers reloadAfter full rebuildImmediate
SpeedSlow for large projectsFast

Benefits of Fast-Serve

Conclusion

Fast-Serve is a must-have tool for SPFx developers to speed up local development. By integrating Fast-Serve into your gulpfile.js, you can focus on writing code instead of waiting for long builds.