How to use the string function from yargs

yargs.string is a method in the yargs library that sets one or more command-line argument keys as strings, so that they are always parsed and returned as string values.

How does yargs.string work?

yargs.string works by setting one or more command-line argument keys as strings in the yargs configuration object. Here's how it works: When you call yargs.string with one or more argument key names, it sets those keys as strings in the yargs configuration object. This tells yargs to always parse those argument values as strings, even if they look like numbers or other types of data. For example, if you have a command-line argument -n that is supposed to be a string value, you can call yargs.string('n') to set -n as a string key. This ensures that the value of -n will always be returned as a string, even if the user inputs a number or other type of value. yargs.string can be useful in situations where you need to ensure that certain command-line arguments are always parsed as strings, regardless of the data type of their values. This can prevent errors and make your code more robust. It's worth noting that yargs.string only affects the parsing behavior of yargs and does not modify the command-line arguments themselves. When you call yargs.parse(), yargs will use the configured string keys to parse the command-line arguments and return the parsed values as a JavaScript object.

Ai Example

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const yargs = require("yargs");

yargs
  .option("name", {
    describe: "Your name",
    type: "string",
  })
  .string("name")
  .help()
  .parse();

console.log(typeof yargs.argv.name); // Output: "string"

In this example, we first import the yargs library and create a new yargs instance. We then use the option method to define a new command-line argument key called 'name', which is a string value that represents the user's name. After defining the 'name' option, we call the string method and pass in 'name' as an argument. This tells yargs to always parse the value of 'name' as a string, regardless of the data type of the user's input. We then call the help method to add a help message to the command-line interface, and finally call parse to parse the command-line arguments and return the results. Finally, we log the type of the 'name' value in the yargs.argv object to the console, which should output "string" if the user provided a value for 'name'. Overall, yargs.string provides a simple way to ensure that a command-line argument is always parsed as a string, which can be useful in a variety of scenarios.