Function fileLoader

docs/app/js/sanddance-app.js:109005–109012

* File system loader factory. * @param {object} fs - The file system interface. * @return {function} - A file loader with the following signature: * param {string} filename - The file system path to load. * param {string} filename - The file system path to load. * return {Promise} A promi

(fs)

 *   param {string} filename - The file system path to load.
 *   return {Promise} A promise that resolves to the file contents.
 */ function fileLoader(fs) {
    return fs ? (filename)=>new Promise((accept, reject)=>{
            fs.readFile(filename, (error, data)=>{
                if (error) reject(error);
                else accept(data);
            });
        }) : fileReject;
}
/**
 * Default file system loader that simply rejects.
 */ async function fileReject() {