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feat: add react fitter component
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‎.gitignore

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# Logs
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logs
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*.log
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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pnpm-debug.log*
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lerna-debug.log*
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node_modules
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dist
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dist-ssr
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*.local
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# Editor directories and files
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.vscode/*
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!.vscode/extensions.json
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.idea
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.DS_Store
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*.suo
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*.ntvs*
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*.njsproj
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*.sln
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*.sw?

‎README.md

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# React + TypeScript + Vite
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This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
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Currently, two official plugins are available:
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- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh
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- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
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## Expanding the ESLint configuration
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If you are developing a production application, we recommend updating the configuration to enable type aware lint rules:
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- Configure the top-level `parserOptions` property like this:
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```js
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export default tseslint.config({
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languageOptions: {
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// other options...
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parserOptions: {
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project: ['./tsconfig.node.json', './tsconfig.app.json'],
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tsconfigRootDir: import.meta.dirname,
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},
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},
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})
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```
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- Replace `tseslint.configs.recommended` to `tseslint.configs.recommendedTypeChecked` or `tseslint.configs.strictTypeChecked`
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- Optionally add `...tseslint.configs.stylisticTypeChecked`
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- Install [eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react) and update the config:
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```js
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// eslint.config.js
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import react from 'eslint-plugin-react'
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export default tseslint.config({
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// Set the react version
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settings: { react: { version: '18.3' } },
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plugins: {
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// Add the react plugin
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react,
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},
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rules: {
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// other rules...
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// Enable its recommended rules
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...react.configs.recommended.rules,
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...react.configs['jsx-runtime'].rules,
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},
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})
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```

‎biome.json

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{
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"$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
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"vcs": {
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"enabled": false,
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"clientKind": "git",
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"useIgnoreFile": false
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},
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"files": {
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"ignoreUnknown": false,
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"ignore": ["dist"]
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},
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"formatter": {
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"enabled": true,
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"indentStyle": "tab"
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},
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"organizeImports": {
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"enabled": true
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},
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"linter": {
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"enabled": true,
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"rules": {
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"recommended": true
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}
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},
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"javascript": {
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"formatter": {
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"quoteStyle": "double"
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}
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}
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}

‎index.html

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<link rel="icon" type="image/svg+xml" href="/vite.svg" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Vite + React + TS</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.tsx"></script>
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</body>
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</html>

‎lib/Fitter.tsx

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import { type ReactNode, useEffect, useRef, useState } from "react";
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import { useDebounce, useResizeObserver } from "./hooks";
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export type FitterProps = {
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children: ReactNode;
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minSize?: number;
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maxLines?: number;
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settlePrecision?: number;
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updateOnSizeChange?: boolean;
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windowResizeDebounce?: number;
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};
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export const Fitter = ({
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children,
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minSize = 0.25,
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maxLines = 1,
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settlePrecision = 0.01,
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updateOnSizeChange = true,
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windowResizeDebounce = 100,
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}: FitterProps) => {
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const wrapperRef = useRef<HTMLDivElement>(null);
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const textRef = useRef<HTMLSpanElement>(null);
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const [size, setSize] = useState(1);
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const [settled, setSettled] = useState(false);
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const [targetMax, setTargetMax] = useState(1);
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useEffect(() => {
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if (settled) return;
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if (!textRef.current) throw new Error("Could not access wrapper ref");
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const lines = textRef.current.getClientRects().length;
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const nextShrinkStep = (size - minSize) / 2;
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const nextGrowStep = (targetMax - size) / 2;
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const nextShrinkSize = size - nextShrinkStep;
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const nextGrowSize = size + nextGrowStep;
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const wantsToShrink = lines > maxLines;
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if (wantsToShrink) {
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if (nextShrinkStep < settlePrecision) {
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setSettled(true);
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return;
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}
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setTargetMax(size);
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setSize(nextShrinkSize);
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return;
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}
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if (nextGrowStep < settlePrecision) {
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setSettled(true);
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return;
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}
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setSize(nextGrowSize);
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}, [size, maxLines, minSize, targetMax, settlePrecision, settled]);
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const start = useDebounce(() => {
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setTargetMax(1);
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setSettled(false);
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}, windowResizeDebounce);
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useResizeObserver(wrapperRef, () => start(), updateOnSizeChange);
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return (
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<div
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ref={wrapperRef}
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className="react-fitter__wrapper"
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style={{
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lineHeight: 0,
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}}
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>
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<span
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ref={textRef}
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style={{
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fontSize: `${size * 100}%`,
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lineHeight: 1,
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}}
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className="react-fitter__text"
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>
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{children}
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</span>
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</div>
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);
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};

‎lib/hooks.ts

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import {
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type RefObject,
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useEffect,
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useLayoutEffect,
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useMemo,
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useRef,
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} from "react";
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const debounce = (callback: () => void, delay: number) => {
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let timeout: NodeJS.Timeout;
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return () => {
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clearTimeout(timeout);
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timeout = setTimeout(callback, delay);
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};
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};
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export const useDebounce = <T extends unknown[], U>(
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callback: (...args: T) => U,
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delay: number,
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) => {
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const callbackRef = useRef(callback);
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useLayoutEffect(() => {
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callbackRef.current = callback;
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});
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return useMemo(
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() => debounce((...args: T) => callbackRef.current(...args), delay),
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[delay],
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);
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};
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export const useResizeObserver = (
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ref: RefObject<HTMLSpanElement>,
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callback: () => void,
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enabled: boolean,
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) => {
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const width = useRef(0);
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// biome-ignore lint/correctness/useExhaustiveDependencies: Using a ref as a dependency doesn't work as expected.
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useEffect(() => {
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if (!ref.current) return;
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if (!enabled) return;
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const observer = new ResizeObserver((entries) => {
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for (const entry of entries) {
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// Some older browsers don't return contentBoxSize
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const newWidth = entry.contentBoxSize
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? entry.contentBoxSize[0].inlineSize
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: entry.contentRect.width;
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if (newWidth !== width.current) {
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width.current = newWidth;
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callback();
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}
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}
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});
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observer.observe(ref.current);
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return () => {
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observer.disconnect();
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};
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}, [enabled]);
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};

‎lib/index.ts

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export * from "./Fitter.js";

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