docs: function _copyFile (origin, target, callback) {
  
  			if ("undefined" === typeof origin) {
  				throw new ReferenceError("Missing \"origin\" argument");
  			}
  				else if ("string" !== typeof origin) {
  					throw new TypeError("\"origin\" argument is not a string");
  				}
  				else if ("" === origin.trim()) {
  					throw new TypeError("\"origin\" argument is empty");
  				}
  			else if ("undefined" === typeof target) {
  				throw new ReferenceError("Missing \"target\" argument");
  			}
  				else if ("string" !== typeof target) {
  					throw new TypeError("\"target\" argument is not a string");
  				}
  				else if ("" === target.trim()) {
  					throw new Error("\"target\" argument is empty");
  				}
  			else if ("undefined" === typeof callback) {
  				throw new ReferenceError("Missing \"callback\" argument");
  			}
  				else if ("function" !== typeof callback) {
  					throw new TypeError("\"callback\" argument is not a function");
  				}
  			else {
  
  				isFileProm(origin).then((exists) => {
  					return exists ? Promise.resolve() : Promise.reject(new Error("There is no origin file \"" + origin + "\""));
  				}).then(() => {
  
  					let error = false;
  
  					const writeStream = createWriteStream(target).once("error", (_err) => {
  
  						error = true;
  						writeStream.close();
  
  						callback(_err);
  
  					}).once("close", () => {
  						return error ? null : callback(null);
  					});
  
  					createReadStream(origin).once("error", (_err) => {
  						error = true; callback(_err);
  					}).pipe(writeStream);
  
  				}).catch(callback);
  
  			}
  
  		}