how do you use the package stand lone by feeding a list of js files to remove IIFE about putout HOT 5 CLOSED

const {readFileSync, writeFileSync} = require('fs');
const putout = require('putout');

const input = readFileSync('./iife.js', 'utf8');
const output = putout(file, {
    plugins: [
        'remove-iife'
    ]
});

writeFileSync('./iife.js', output);

//requiring path and fs modules
const path = require('path');
const fs = require('fs');
//joining path of directory 
const directoryPath = path.join(__dirname, 'src/app');

let walk = (directoryPath, fileList = []) => {
    const files = fs.readdirSync(directoryPath);
    files.forEach(function(file) {
        let isDirectory = fs.statSync(path.join(directoryPath, file)).isDirectory();
        if (isDirectory) {
            filelist = walk(path.join(directoryPath, file), fileList); // recursively go thru the sub directory call 
        } else {
            //console.log(file, " is a file ", !isDirectory);
            var jsFilterRegex = /\.js$/;
            if (jsFilterRegex.test(file)) {
                console.log("Removing IIFE with putout plugin  ", file);
                const input = fs.readFileSync(path.join(directoryPath, file), 'utf8');
                /**
                 * This part of the code is not tested with the putout plugin but you get the idea
                 */
                const output = putout(file, {
                    plugins: [
                        'remove-iife'
                    ]
                });
                fs.writeFileSync(directoryPath, file, output);
                /** Not tested  */
            }
            fileList.concat(path.join(directoryPath, file)); // store the files
        }
    });
    return fileList;
};
let all_files = []
all_files = walk(directoryPath, all_files);