How to use the image-size/lib/types/png.calculate function in image-size
To help you get started, we’ve selected a few image-size examples, based on popular ways it is used in public projects.
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brave / ethereum-remote-client / test / screens / new-ui.js View on Github 
async function generateGif(){
// calculate screenshot size
const screenshot = await driver.takeScreenshot()
const pngBuffer = Buffer.from(screenshot, 'base64')
const size = sizeOfPng.calculate(pngBuffer)
// read only the english pngs into gif
const encoder = new GIFEncoder(size.width, size.height)
const stream = pngFileStream('./test-artifacts/screens/* (en).png')
.pipe(encoder.createWriteStream({ repeat: 0, delay: 1000, quality: 10 }))
.pipe(fs.createWriteStream('./test-artifacts/screens/walkthrough (en).gif'))
// wait for end
await pify(endOfStream)(stream)
}
