joplin/packages/app-desktop/integration-tests/util/getImageSourceSize.ts

import { Locator } from '@playwright/test';

const getImageSourceSize = async (imageLocator: Locator) => {
	// Use state: 'attached' -- we don't need the image to be on the screen (just present
	// in the DOM).
	await imageLocator.waitFor({ state: 'attached' });

	// We load a copy of the image to avoid returning an overriden width set with
	//    .width = some_number
	return await imageLocator.evaluate((originalImage: HTMLImageElement) => {
		return new Promise<[number, number]>(resolve => {
			const testImage = new Image();
			testImage.onload = () => {
				resolve([testImage.width, testImage.height]);
			};
			testImage.src = originalImage.src;
		});
	});
};

export default getImageSourceSize;