5/2/2023 0 Comments Nodejs command line arguments![]() Now that we have our node project ready we move to actually make the CLI. Initialize a Node.js project in that folder. This explains how a simple looking property access actually invokes the functionality we expect from yargs.We’ll be setting up a basic Node.js project:Ģ. After digging into it a bit, is discovered that argv is setup as a javascript getter, which means accessing this property actually invokes a method. This appears to be a simple property access that has no reason to be there. Instead, the same options be available for all your commands. Yargs does not appear to let you define options that are specific to a command. ![]() The call to command does not return a command object, it returns the same object instance returned by the call to require('yargs'). It may look like the option method is setting up a -verbose/-v flag for the command, but these options appear to be global for every command. The command method accepts four arguments - one is the command’s name with its position arguments, the second is a description, the third is a function you can use to configure things about your command’s positional arguments, and the fourth is a command that does the actual work. ![]() To setup a command you call the command method of the object returned by the yargs module. If we write that hello world code in a different way - require('yargs') I’m still not a fan of this particular style of function declaration, but that’s another post for another time. return by the single line is the value returned byĬonst myFunctionAlsoUgh = () => /* single line of function code here/* arrow functions may also look like this - the value ![]() command('serve ', 'start the server', (yargs) => The rest of this post is a few places where the choices of the yargs engineers clashed with my own expectations.įirst - here’s their Hello World example. Yargs appears to fall mostly in the When All we had was Callbacks camp. I’ve noticed the ongoing challenges/evolution of single threaded asynchronous programming means there’s a few distinct styles out there I’m coming up on the one year anniversary of NodeJS being my primary programming language, and I’m starting to get a better feel for how folks organize their programs and libraries. It’s also been around for six plus years and is still receiving updates. Yargs provides mature argument and option parsing for command line programs (both -foo and -b style options) and features for defining individual sub-commands (think programs like git sub-command). The pile of one-off command line scripts I’ve written for my current weekend projecting finally reached the critical mass where they needed some organizing, which led me to discover the yargs project. That Efficiency of Programming Languages Image Trying to Understand Mastodon's Federation Quick dispatches from the life of a working programmer.Īccessing Docker Desktop's Virtual Machineįive Reasons Your PHP Application is Hard to Containerize for Production ![]() Grab a copy and start working with Magento instead of against it. Whether you’re just starting out or you’re a seasoned pro, Commerce Bug will save you and your team hours everyday. The must have debugging extension for anyone using Magento. Yargs and Command Line Argument Processing in NodeJS astorm
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