function watchBegin(filePath){
        watcher = chokidar.watch(filePath,{
            persistent:true,
            ignoreInitial:true,//開始当初のフォルダーは反応させない
            depth:0//0にしないと再帰的にファイルをチェックするっぽい
        });
        watcher.on("add",f => {console.log(`file ${f} has been added`)
                dispatchJSX(f);
                })
                .on("change",f => console.log(`file ${f} has been changed`))
                .on("unlink",f => console.log(`file ${f} has been removed`));
 }