image-size/dist/esm/detector.js

get dimensions of any image file

import { typeHandlers, types } from './types/index.js';
const firstBytes = new Map([
    [0x00, 'heif'],
    [0x38, 'psd'],
    [0x42, 'bmp'],
    [0x44, 'dds'],
    [0x47, 'gif'],
    [0x49, 'tiff'],
    [0x4d, 'tiff'],
    [0x52, 'webp'],
    [0x69, 'icns'],
    [0x89, 'png'],
    [0xff, 'jpg'],
]);
export function detector(input) {
    const byte = input[0];
    const type = firstBytes.get(byte);
    if (type && typeHandlers.get(type)?.validate(input)) {
        return type;
    }
    return types.find((type) => typeHandlers.get(type)?.validate(input));
}