Created
April 24, 2023 20:24
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JSX to PNG via Satori and resvg-js
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const htm = require('htm'); | |
const { default: satori } = require('satori'); | |
const { Resvg } = require('@resvg/resvg-js') | |
const { promises } = require('node:fs'); | |
const { join } = require('node:path') | |
const html = htm.bind(function jsxToObject(type, props, ...children) { | |
return { | |
type, | |
props: { | |
...props, | |
children: children?.length === 1 ? children[0] : children, | |
} | |
}; | |
}); | |
const openSansFilePath = join( | |
__dirname, | |
'./open-sans/static/OpenSans/OpenSans-Regular.ttf' | |
); | |
(async () => { | |
const openSansBuffer = await promises.readFile(openSansFilePath); // can be cached | |
const t = performance.now(); | |
const svg = await satori( | |
html`<div style=${{ color: 'black', fontFamily: 'Open Sans' }}>The Quick Brown Fox Jumped Over The Lazy Dog</div>`, | |
{ | |
width: 600, | |
height: 400, | |
fonts: [ | |
{ | |
name: 'Open Sans', | |
data: openSansBuffer, | |
weight: 400, | |
style: 'normal', | |
}, | |
], | |
}, | |
); | |
const resvg = new Resvg(svg, { | |
background: 'rgba(238, 235, 230, .9)', | |
fitTo: { | |
mode: 'width', | |
value: 600, | |
}, | |
font: { | |
fontFiles: [openSansFilePath], // Load custom fonts. | |
loadSystemFonts: false, // It will be faster to disable loading system fonts. | |
defaultFontFamily: 'Open Sans', | |
}, | |
// imageRendering: 1, | |
// shapeRendering: 2, | |
// logLevel: 'debug', // Default Value: error | |
}); | |
const pngData = resvg.render(); | |
const pngBuffer = pngData.asPng(); | |
await promises.writeFile(join(__dirname, './output.png'), pngBuffer); | |
console.info('Output PNG Size :', `${pngData.width} x ${pngData.height}`); | |
console.info('Original SVG Size:', `${resvg.width} x ${resvg.height}`); | |
console.info('✨ Done in', performance.now() - t, 'ms'); | |
})(); |
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