README.md

Charlie Tango Hooks

Collection of React Hooks used by Charlie Tango.

• Written in TypeScript, with full types support.
• Small and focused, each hook does one thing well.
• No barrel file, only import the hooks you need.
• Exported as ESM.
• Optimized for modern React, uses newer APIs like useSyncExternalStore.
• All hooks work in a server-side rendering environment.
• All hooks are tested with Vitest in a real browser environment.

Installation

Install using npm:

npm install @charlietango/hooks --save

The Hooks

All the hooks are exported on their own, so we don't have a barrel file with all the hooks. This guarantees that you only import the hooks you need, and don't bloat your bundle with unused code.

useDebouncedValue

Debounce a value. The value will only be updated after the delay has passed without the value changing.

import { useDebouncedValue } from "@charlietango/hooks/use-debounced-value";

const [debouncedValue, setDebouncedValue] = useDebouncedValue(
  initialValue,
  500,
);

setDebouncedValue("Hello");
setDebouncedValue("World");
console.log(debouncedValue); // Will log "Hello" until 500ms has passed

The setDebouncedValue also contains a few control methods, that can be useful:

• flush: Call the callback immediately, and cancel debouncing.
• cancel: Cancel debouncing, and the callback will never be called.
• isPending: Check if the callback is waiting to be called. You can use them like this:

const [debouncedValue, setDebouncedValue] = useDebouncedValue(
  initialValue,
  500,
);

setDebouncedValue("Hello");
setDebouncedValue.isPending(); // true
setDebouncedValue.flush(); // Logs "Hello"
setDebouncedValue("world");
setDebouncedValue.cancel(); // Will never log "world"

useDebouncedCallback

Debounce a callback function. The callback will only be called after the delay has passed without the function being called again.

import { useDebouncedCallback } from "@charlietango/hooks/use-debounced-callback";

const debouncedCallback = useDebouncedCallback((value: string) => {
  console.log(value);
}, 500);

debouncedCallback("Hello");
debouncedCallback("World"); // Will only log "World" after 500ms

The debouncedCallback also contains a few control methods, that can be useful:

• flush: Call the callback immediately, and cancel debouncing.
• cancel: Cancel debouncing, and the callback will never be called.
• isPending: Check if the callback is waiting to be called.

You can use them like this:

const debouncedCallback = useDebouncedCallback((value: string) => {
  console.log(value);
}, 500);

debouncedCallback("Hello");
debouncedCallback.isPending(); // true
debouncedCallback.flush(); // Logs "Hello"
debouncedCallback("world");
debouncedCallback.cancel(); // Will never log "world"

useElementSize

Monitor the size of an element, and return the size object. Uses the ResizeObserver API, so it will keep track of the size changes.

import { useElementSize } from "@charlietango/hooks/use-element-size";

const { ref, size } = useElementSize(options);

useMedia

Monitor a media query, and return a boolean indicating if the media query matches. Until the media query is matched, the hook will return undefined.

import { useMedia } from "@charlietango/hooks/use-media";

const isDesktop = useMedia({ minWidth: 1024 });
const prefersReducedMotion = useMedia(
  "(prefers-reduced-motion: no-preference)",
);

usePrevious

Keep track of the previous value of a variable.

import { usePrevious } from "@charlietango/hooks/use-previous";

const prevValue = usePrevious(value);

useScript

When loading external scripts, you might want to know when the script has loaded, and if there was an error. Because it's external, it won't be able to trigger a callback when it's done - Therefor you need to monitor the <script> tag itself. The useScript hook will handle this for you.

You can load the same script multiple times, and the hook will share the script and status between all instances.

import { useScript } from "@charlietango/hooks/use-script";

const status = useScript("https://example.com/script.js"); // "idle" | "loading" | "ready" | "error"
if (status === "ready") {
  // Script is loaded
}

useWindowSize

Get the current window size. If the window resizes, the hook will update the size.

import { useWindowSize } from "@charlietango/hooks/use-window-size";

const { width, height } = useWindowSize();