How to use the constant function from yargs

Find comprehensive JavaScript yargs.constant code examples handpicked from public code repositorys.

yargs.constant is a method in the yargs library that adds a constant to the parsed output of command line arguments, regardless of whether the constant is specified in the arguments.

main_pilverifier.js

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    console.log("Only one commit file at a time is permited");
    process.exit(1);
}

const publics = typeof(argv.publics) === "string" ?  JSON.parse(fs.readFileSync(argv.publics.trim())) : false;
const constantFile = typeof(argv.constant) === "string" ?  argv.constant.trim() : "constant.bin";

const config = typeof(argv.config) === "string" ? JSON.parse(fs.readFileSync(argv.config.trim())) : {};

if (argv.verbose) {

+ 6 other calls in file

How does yargs.constant work?

The yargs.constant method is a part of the yargs library, which is a command line argument parsing library for Node.js. When you call the yargs.constant method, you pass in two arguments: a name for the constant, and the value of the constant. The method then adds the constant to the parsed output of command line arguments, regardless of whether the constant is specified in the arguments. This can be useful when you want to add a fixed value to the parsed output of command line arguments, such as a default value or a constant flag. For example, you can use the yargs.constant method to add a constant flag to the parsed output of command line arguments: javascript Copy code {{{{{{{ const yargs = require('yargs'); const argv = yargs .boolean('verbose') .constant('name', 'John') .parse(); console.log(argv); In this example, we first require the yargs module in our Node.js application. We then call the boolean method to specify that a boolean flag named 'verbose' should be added to the parsed output of command line arguments. We then call the constant method to specify that a constant named 'name' with a value of 'John' should be added to the parsed output of command line arguments. We finally call the parse method to parse the command line arguments, storing the parsed output in the argv variable. Overall, the yargs.constant method provides a simple and flexible way to add constants to the parsed output of command line arguments in a Node.js application using the yargs library.

Ai Example

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const yargs = require("yargs");

const argv = yargs.boolean("verbose").constant("name", "John").parse();

console.log(argv);

In this example, we first require the yargs module in our Node.js application. We then call the boolean method to specify that a boolean flag named 'verbose' should be added to the parsed output of command line arguments. We then call the constant method to specify that a constant named 'name' with a value of 'John' should be added to the parsed output of command line arguments. We finally call the parse method to parse the command line arguments, storing the parsed output in the argv variable. When we run our Node.js application with the command line argument --verbose, the verbose flag will be set to true in the argv object, and the name constant will be set to 'John': bash Copy code

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