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yargs-promise
Advanced tools
Use the headless yargs parser with promises!
npm
npm install --save yargs-promise
yarn
yarn add --save yargs-promise
Instead of using a callback with yargs.parse, use a promise chain: parser.parse(text).then().catch()
.
Examples:
const yargs = require('yargs');
const YargsPromise = require('yargs-promise');
// create the customized yargs parser
const parser = new YargsPromise(yargs);
// setup command & command handler
parser
.command('hello <name>', 'hello world parser' , ()=>{}, (argv) => {
// resolve a promise or other value
argv.resolve(doSomething);
// reject stuff
argv.reject(yourErrorData);
// or do nothing and reject/resolve will be handled internally
console.log('testing argv');
})
.help();
// parse text input and use the returned promise
parser.parse('hello world')
.then(({data, argv}) => {
// data is what your code resolved or what an internal command resolved
})
.catch(({error, argv}) => {
// `error` is what your code rejected or an internal error from yargs
});
Customizing context example
const yargs = require('yargs');
const YargsPromise = require('yargs-promise');
const parser = new YargsPromise(
yargs,
// customize context
{
customContextMethod: () => {},
foo: 'bar'
}
);
parser
.command('hello <name>', 'hello world parser' , ()=>{}, (argv) => {
// argv now contains
argv.customContextMethod();
console.log(argv.foo);
})
.help();
Need access to yargs object? Work with the direct yargs
object prior to passing it into the yargs-promise constructor. For convenience, it is also available at parser.yargs
.
This library does three things:
resolve
& reject
methods on the context passed to yargs.parse
argv.resolve
or argv.reject
in command handler function.help()
Checkout the source code or tests for more information.
Building chatbots requires parsing and handling text input. This wraps up the most common needs I've come across for handling errors, simple commands, and commands with handlers.
FAQs
Use the headless yargs parser with promises
We found that yargs-promise demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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