import { use, Suspense, createContext } from "react";
const ThemeContext = createContext("light");
const greetingCache = new Map<string, Promise<string>>();
Read promises and context directly during render with React's built-in use hook.
type Resource<T> = { read: () => T };
const cache = new Map<string, Resource<unknown>>();
export const getResource = <T,>(key: string, fetchData: () => Promise<T>): Resource<T> => {Build the tiny promise cache that makes Suspense-based data fetching work: throw while pending, cache the result, return it once resolved.
import { lazy, Suspense, Component, type ReactNode } from "react";
// In a real app, SettingsPanelImpl would live in its own file and this
// would be lazy(() => import("./SettingsPanel")) instead -- this snippet
// is one self-contained file, so it wraps an inline component the sameCode-split a component with React.lazy and catch its load failures with an error boundary, so a flaky chunk load does not blank the page.