webAO/utils/findImgSrc.ts


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import filesExist from "./filesExist";
import transparentPng from '../constants/transparentPng'

/**
 * This function takes a list of urls and returns the first one that exists.
 * If none is found, return a transparent png.
 * The function will always return a value that is appriopriate for an img src.
 * @param urls The list of urls to try
 * @returns The image source of the first url that exists, or a transparent png if none exist
 */
export default async function findImgSrc(urls: string[]): Promise<string> {
    return filesExist(urls).then((url) => {
        if (url !== null) {
            return url;
        }
        // If none of the images exist, return a transparent png
        return transparentPng;
    });
}