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TypeScript Academy · Lesson

Suspense & error boundaries types

Use React.Suspense with lazy components and type robust Error Boundaries (class-based). Handle unknown errors safely and provide reset patterns.

Intro

Goal: Lazy-load components with React.lazy + Suspense, and add a typed Error Boundary that shows a friendly fallback and logs details.

  • Suspense = loading UI
  • Error Boundary = runtime error UI
  • Type unknown errors safely

Lazy + Suspense

React.lazy returns a component type. Wrap it in Suspense to render a fallback while its module is loading.

import React, { Suspense } from "react"

const LazyWidget = React.lazy(async () => import("./Widget"))

export default function App() {
  return (
    <div style={{ display: "grid", gap: 8 }}>
      <Suspense fallback={<span>Loading…</span>}>
        <LazyWidget />
      </Suspense>
    </div>
  )
}

All lessons in this course

  1. Custom hooks with generics & inference
  2. Suspense & error boundaries types
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