astro/dist/assets/utils/vendor/image-size/lookup.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

import { typeHandlers } from "./types/index.js";
import { detector } from "./detector.js";
/**
* Return size information based on an Uint8Array
*
* @param {Uint8Array} input
* @returns {ISizeCalculationResult}
*/
export function lookup(input) {
	// detect the file type... don't rely on the extension
	const type = detector(input);
	if (typeof type !== "undefined") {
		// find an appropriate handler for this file type
		const size = typeHandlers.get(type).calculate(input);
		if (size !== undefined) {
			size.type = size.type ?? type;
			return size;
		}
	}
	// throw up, if we don't understand the file
	throw new TypeError("unsupported file type: " + type);
}