Node tips

node.js

#!/usr/bin/node  // shebang

//
// mkdir -p
//
const fs = require('node:fs/promises')

// Creates /tmp/a/apple, regardless of whether `/tmp` and /tmp/a exist.
await fs.mkdir('/tmp/a/apple', { recursive: true }, (err) => {
  if (err) throw err;
});

// ----------------------------------------------------

//
// Is this file running because it was called via CLI?
// (ESM edition)
//
import { resolve } from 'path'
import { fileURLToPath } from 'url'

const pathToThisFile = resolve(fileURLToPath(import.meta.url))
const pathPassedToNode = resolve(process.argv[1])
const isThisFileBeingRunViaCLI = pathToThisFile.includes(pathPassedToNode)

// ----------------------------------------------------

//
// __dirname
//
import path from 'path'
import { fileURLToPath } from 'url'
const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)

// -------------------------------------------------------

//
// __rm -rf / rimraf__
//
// @see https://nodejs.org/api/fs.html#fspromisesrmdirpath-options --
// > To get a behavior similar to the rm -rf Unix command, use 
// > fsPromises.rm() with options { recursive: true, force: true }.
//

import { fs } from 'fs/promises'
await fs.rm('my-file.txt', { recursive: true, force: true })

//
// Set the working directory
//
import process from 'node:process'
process.chdir(__dirname)

Get the env variables from a file

export $(cat .env | grep -e '^[^#]*$') | xargs && esbuild ...