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'use strict';
const _ = require('lodash');const fs = require('fs-extra');const uglify = require('uglify-js');
const uglifyOptions = require('./uglify.options');
/*----------------------------------------------------------------------------*/
/** * Asynchronously minifies the file at `srcPath`, writes it to `destPath`, and * invokes `callback` upon completion. The callback is invoked with one argument: * (error). * * If unspecified, `destPath` is `srcPath` with an extension of `.min.js`. * (e.g. the `destPath` of `path/to/foo.js` would be `path/to/foo.min.js`) * * @param {string} srcPath The path of the file to minify. * @param {string} [destPath] The path to write the file to. * @param {Function} callback The function invoked upon completion. * @param {Object} [option] The UglifyJS options object. */function minify(srcPath, destPath, callback, options) {  if (_.isFunction(destPath)) {    if (_.isObject(callback)) {      options = callback;    }    callback = destPath;    destPath = undefined;  }  if (!destPath) {    destPath = srcPath.replace(/(?=\.js$)/, '.min');  }  const output = uglify.minify(srcPath, _.defaults(options || {}, uglifyOptions));  fs.writeFile(destPath, output.code, 'utf-8', callback);}
module.exports = minify;