React 19 7,897 has no UMD build, so this build-free page imports ES modules from jsDelivr 15,886 and writes markup with htm templates (identical in JSX). jsDelivr's react-dom imports react@^19.3.0; importing react@19.3.0 separately loaded a second React and hooks failed ("reading 'useState'"), so the page uses that exact URL:
<script src="https://cdn.jsdelivr.net/npm/d3@7.9.0/dist/d3.min.js"></script>
<script src="booknest-sales.js"></script><script src="booknest-prep.js"></script>
<div id="root" style="font:12px Arial"></div>
<script type="module">
const cdn = 'https://cdn.jsdelivr.net/npm/'; // react-dom imports react@^19.3.0,
const React = (await import(`${cdn}react@%5E19.3.0/+esm`)).default; // so use that same URL
const { createRoot } = await import(`${cdn}react-dom@19.3.0/client/+esm`);
const html = (await import(`${cdn}htm@3.1.1/+esm`)).default.bind(React.createElement);
const { useMemo, useRef, useEffect } = React;
function RatingsChart({ rows, width = 560, height = 150 }) {
const x = useMemo(() => d3.scaleLinear([0, 5], [170, width - 30]), [width]);
const y = useMemo(() => d3.scaleBand(rows.map(r => r.key), [0, height - 20]).padding(0.2),
[rows, height]);
const axis = useRef(null);
useEffect(() => { d3.select(axis.current).call(d3.axisBottom(x).ticks(5)); }, [x]);
return html`<svg width=${width} height=${height}>
${rows.map(r => html`<g key=${r.key} transform=${`translate(0,${y(r.key)})`}>
<rect x=${x(0)} width=${x(r.mean) - x(0)} height=${y.bandwidth()} fill=${r.color} />
<text x=${x(0) - 6} y=${y.bandwidth() / 2} dy="0.35em" text-anchor="end">
${r.title}</text>
</g>`)}
<g ref=${axis} transform=${`translate(0,${height - 20})`} />
</svg>`;
}
const rows = prepareSales(SALES).ratings.map(r => ({ ...r.book,
mean: d3.sum(r.counts, (c, i) => c * (i + 1)) / d3.sum(r.counts) }))
.sort((a, b) => b.mean - a.mean);
createRoot(document.getElementById('root')).render(html`<${RatingsChart} rows=${rows} />`);
setTimeout(() => { window.__done = true; }, 300); // after React's first commit
</script>
useEffect draws the axis after React commits its <g>, and again only when the scale changes; hover would be plain React state. A real project bundles .jsx with Vite 25,978 (MERN Stack Development) and imports only the D3 18,089 modules it uses.
<!doctype html>
<style>
body { margin: 0; padding: 8px; background: #fafaf7; font: 12px system-ui, sans-serif; color: #263238; }
#root svg { max-width: 100%; height: auto; }
</style>
<script src="https://cdn.jsdelivr.net/npm/d3@7.9.0/dist/d3.min.js"></script>
<!-- react-dom's CDN build imports react@^19.3.0: map every React URL to that one copy -->
<script type="importmap">
{ "imports": {
"react": "https://cdn.jsdelivr.net/npm/react@%5E19.3.0/+esm",
"react-dom/client": "https://cdn.jsdelivr.net/npm/react-dom@19.3.0/client/+esm",
"htm": "https://cdn.jsdelivr.net/npm/htm@3.1.1/+esm",
"https://cdn.jsdelivr.net/npm/react@19.3.0/+esm": "https://cdn.jsdelivr.net/npm/react@%5E19.3.0/+esm" } }
</script>
<div id="root"></div>
<script type="module">
import React, { useMemo, useRef, useEffect, useState } from 'react';
import { createRoot } from 'react-dom/client';
import htm from 'htm';
const html = htm.bind(React.createElement); // tagged templates, identical in JSX
// BookNest sample data, invented for these examples (not real sales)
const SALES = (() => {
const books = [
{ id: 1, key: 'harbor', title: 'The Quiet Harbor', author: 'Elena Marsh', genre: 'Fiction', color: '#1f5f8b', price: 18.99, rating: 4.6 },
{ id: 2, key: 'deepweb', title: 'Patterns of the Deep Web', author: 'Ravi Menon', genre: 'Technology', color: '#5b3f99', price: 39.5, rating: 4.3 },
{ id: 3, key: 'saffron', title: 'Salt and Saffron', author: 'Leila Haddad', genre: 'Cooking', color: '#e09a10', price: 24, rating: 4.8 },
{ id: 4, key: 'summit', title: 'Small Steps to Big Summits', author: 'Tom Okafor', genre: 'Self-Help', color: '#3f7d3a', price: 14.99, rating: 4.1 },
{ id: 5, key: 'clock', title: "The Clockmaker's Paradox", author: 'Iris Vale', genre: 'Science Fiction', color: '#b5452f', price: 16.2, rating: 4.5 },
{ id: 6, key: 'glass', title: 'Gardens in Glass', author: 'June Park', genre: 'Gardening', color: '#2a9d8f', price: 22.5, rating: 4.4 },
];
const units = { // units sold per month, January 2025 to August 2026
1: [40, 47, 46, 47, 57, 51, 46, 54, 60, 60, 71, 111, 52, 42, 49, 56, 59, 48, 53, 51],
2: [40, 37, 35, 41, 48, 43, 40, 42, 50, 53, 53, 84, 42, 35, 38, 41, 45, 41, 46, 46],
3: [46, 45, 41, 46, 53, 49, 46, 45, 60, 51, 63, 100, 48, 48, 49, 48, 53, 49, 48, 52],
4: [100, 80, 72, 70, 66, 66], // released March 2026
5: [48, 47, 54, 52, 65, 55, 57, 58, 64, 66, 75, 124, 58, 49, 59, 56, 63, 57, 54, 57],
6: [31, 30, 28, 35, 31, 32, 29, 30, 41, 36, 45, 64, 31, 30, 30, 38, 40, 38, 36, 38],
};
const months = d3.utcMonths(new Date('2025-01-01'), new Date('2026-09-01')).map(d3.utcFormat('%Y-%m'));
const sales = books.flatMap(b => units[b.id].map((n, i) =>
({ month: months[i + months.length - units[b.id].length], book: b.id, units: n })));
const ratings = [[4, 8, 20, 87, 293], [6, 10, 22, 95, 147], [2, 3, 8, 45, 342], [2, 3, 8, 24, 28],
[4, 8, 20, 90, 228], [4, 7, 20, 82, 147]].map((counts, i) => ({ book: i + 1, counts })); // 1 to 5 stars
const regions = [{ id: '826', name: 'United Kingdom', units: 1480 }, { id: '276', name: 'Germany', units: 1120 },
{ id: '250', name: 'France', units: 760 }, { id: '372', name: 'Ireland', units: 540 },
{ id: '528', name: 'Netherlands', units: 410 }, { id: '724', name: 'Spain', units: 320 }];
const links = [[5, 1, 38], [1, 3, 24], [2, 5, 18], [3, 6, 21], [4, 1, 12], [2, 6, 9], [4, 3, 15], [5, 6, 14]]
.map(([source, target, value]) => ({ source, target, value })); // customers who bought both
return { books, sales, ratings, regions, links };
})();
// prepareSales(raw): parsed dates, sales linked to book objects, revenue and totals
function prepareSales(raw) {
const parse = d3.utcParse('%Y-%m'), books = raw.books.map(b => ({ ...b }));
const byId = d3.index(books, b => b.id);
const sales = raw.sales.map(s => ({ date: parse(s.month), book: byId.get(s.book),
units: s.units, revenue: s.units * byId.get(s.book).price }));
for (const [book, rows] of d3.group(sales, s => s.book)) {
book.units = d3.sum(rows, s => s.units);
book.revenue = d3.sum(rows, s => s.revenue);
}
const months = d3.rollups(sales, v => ({ units: d3.sum(v, s => s.units),
revenue: d3.sum(v, s => s.revenue) }), s => +s.date).map(([t, v]) => ({ date: new Date(t), ...v }))
.sort((a, b) => a.date - b.date);
const ratings = raw.ratings.map(r => ({ ...r, book: byId.get(r.book) }));
return { ...raw, books, sales, months, ratings };
}
function RatingsChart({ rows, width = 560, height = 170 }) {
const [hover, setHover] = useState(null); // hover is plain React state
const x = useMemo(() => d3.scaleLinear([0, 5], [170, width - 40]), [width]);
const y = useMemo(() => d3.scaleBand(rows.map(r => r.key), [0, height - 20]).padding(0.2), [rows, height]);
const axis = useRef(null);
// d3-axis must own its <g>: draw it after React commits, and again only when x changes
useEffect(() => { d3.select(axis.current).call(d3.axisBottom(x).ticks(5)); }, [x]);
return html`<svg width=${width} height=${height} font-size="12">
${rows.map(r => html`<g key=${r.key} transform=${`translate(0,${y(r.key)})`}
onPointerEnter=${() => setHover(r.key)} onPointerLeave=${() => setHover(null)}>
<rect x=${x(0)} width=${x(r.mean) - x(0)} height=${y.bandwidth()} fill=${r.color}
opacity=${hover && hover !== r.key ? 0.3 : 1} />
<text x=${x(0) - 6} y=${y.bandwidth() / 2} dy="0.35em" text-anchor="end">${r.title}</text>
<text x=${x(r.mean) + 4} y=${y.bandwidth() / 2} dy="0.35em">${r.mean.toFixed(2)}</text>
</g>`)}
<g ref=${axis} transform=${`translate(0,${height - 20})`} />
</svg>`;
}
const rows = prepareSales(SALES).ratings.map(r => ({ ...r.book,
mean: d3.sum(r.counts, (c, i) => c * (i + 1)) / d3.sum(r.counts) })).sort((a, b) => b.mean - a.mean);
createRoot(document.getElementById('root')).render(html`<${RatingsChart} rows=${rows} />`);
</script>