Lazy Load Your JavaScript Modules Like a Pro

Lazy Load Your JavaScript Modules Like a Pro

Photo by Kate Stone Matheson on Unsplash

Efficient web development necessitates judicious management of available resources, ensuring optimal performance whilst delivering delightful user experiences. One proven technique entails delaying non-critical assets’ loading — notably JavaScript modules — until truly needed, hence coining the term lazy loading.

Prerequisites

Before diving headfirst into murky waters, arm ourselves with ample background knowledge regarding dynamic imports, ES6 modules, and bundlers like Webpack or Rollup. These technologies shall serve as cornerstones underpinning our exploration, providing solid foundation and indispensable scaffolding along the way.

Dynamic Imports

Birthed from TC39 proposal stages, dynamic imports offer runtime evaluation capabilities, gracefully postponing nonessential scripts’ execution until genuinely warranted.

Coupled with Promises and async/await mechanisms, lazily loaded resources morph into consumable chunks eagerly awaiting consumption.

For instance, imagine nestling a sleepy module named sleepyMonkey.js somewhere within our project tree:

// Sleepy Monkey Business Logic
export default ()…