NodeJS

#javascript #typescript #webdev

Tips & Tricks

get file's update / modified time

[link](https://thewebdev.info/2022/03/05/how-to-get-a-files-last-modified-date-in-node-js/#:~:text=To get a file’s last modified date in,to get the last modified date for asynchronously.)

// sync
fs.stat("/dir/file.txt", (err, stats) => {
  const {
    mtime
  } = stats;
  console.log(mtime);
});

// async
const stats = fs.statSync("/dir/file.txt");
const {
  mtime
} = stats;
console.log(mtime);

if(fs.existsSync(srcPath) && fs.lstatSync(srcPath).isDirectory()){
	// returns true if path leads to DIRECTORY

} else if(fs.existsSync(srcPath) && fs.lstatSync(srcPath).isFile()) {
	// returns true if path leads to FILE
}

root-path.mjs -> put this file in the root of your project

import * as path from 'path'
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

export const __rootDir = __dirname //import this to use in any file

Copy / Clone directory and files

const { promises: fs } = require("fs")
const path = require("path")

async function copyDir(src, dest) {
    await fs.mkdir(dest, { recursive: true });
    let entries = await fs.readdir(src, { withFileTypes: true });

    for (let entry of entries) {
        let srcPath = path.join(src, entry.name);
        let destPath = path.join(dest, entry.name);

        entry.isDirectory() ?
            await copyDir(srcPath, destPath) :
            await fs.copyFile(srcPath, destPath);
    }
}

import { promises as fs } from "fs"
import path from "path"

export const copyDirectory = async (src: string, dest: string) => {
  const [entries] = await Promise.all([
    fs.readdir(src, { withFileTypes: true }),
    fs.mkdir(dest, { recursive: true }),
  ])

  await Promise.all(
    entries.map((entry) => {
      const srcPath = path.join(src, entry.name)
      const destPath = path.join(dest, entry.name)
      return entry.isDirectory()
        ? copyDirectory(srcPath, destPath)
        : fs.copyFile(srcPath, destPath)
    })
  )
}

Error: Import statment outside module, typscript babel

javascript - SyntaxError: Cannot use import statement outside a module - Stack Overflow

Recursivley read file paths in directory & return array of strings

https://stackoverflow.com/a/45130990/15579591

const { resolve } = require('path');
const { readdir } = require('fs').promises;

async function getFiles(dir) {
  const dirents = await readdir(dir, { withFileTypes: true });
  const files = await Promise.all(dirents.map((dirent) => {
    const res = resolve(dir, dirent.name);
    return dirent.isDirectory() ? getFiles(res) : res;
  }));
  return Array.prototype.concat(...files);
}

// return example

// [
	// C:\\users\\you\\app\\folder\\file1
	// C:\\users\\you\\app\\folder\\file2
	// C:\\users\\you\\app\\folder2\\file1
	// C:\\users\\you\\app\\folder2\\file2
// ]

run a javascript (js) module via command line

being able to to run any js file via a terminal inside of your ReactJS app seems simple, but requires special file naming

serverScript.mjs --> notice the .mjs as we'll need that for the import

export function printToConsole(string) {

  console.log(string)

}

runMe.mjs

import {printToConsole} from './`serverScript.mjs';

printToConsole('Hello World')

node runMe.mjs --> don't forget the file extension .mjs when running this node file

Get current running operating system

let osValue = process.platform;

if (osValue == 'darwin') {
    console.log("Mac OS");
}else if(osValue == 'win32'){
    console.log("Window OS")
}else if(osValue== 'android') {
    console.log("Android OS")
}else if(osValue== 'linux') {
    console.log("Linux OS")
}
else{
    console.log("Other os")
}

import * as Os from 'os'


console.log(Os.release()); 
console.log(Os.platform()); 

// output 
// 10.0.21996
// win32