npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@thisismanta/pessimist

v3.0.0

Published

```ts import { parseArguments } from '@thisismanta/pessimist'

Downloads

81,746

Readme

import { parseArguments } from '@thisismanta/pessimist'

const { count, dryRun, outputFileName, ...positionalArguments } =
parseArguments(
  process.argv.slice(2), 
  {
    count: 0,
    dryRun: false,
    outputFileName: '',
    exclude: [],
  }
)

for (const item of Array.from(positionalArguments)) {
  // ...
}
file1 file2 --count=3 --output-file-name=file3
{
  // From the positional arguments
  '0': 'file1', 
  '1': 'file2',
  length: 2,

  // From the named arguments
  outputFileName: 'file3',
  dryRun: true,

  // From the defaults
  count: 0,
  exclude: [],
}

Unknown field rejection

The below commands exit with non-zero code as somethingElse is not defined in the default object (the second parameter of parseArguments function).

--something-else
# Error: Unexpected an unknown argument: --something-else

Therefore it is important to have all the possible field-value arguments defined in the default object.

Auto camel-case conversion

The below commands yield the same output because dry-run is transformed into a camel case.

--dryRun  # { dryRun: true }
--dry-run # { dryRun: true }

False-like Boolean recognition

The below commands yield the same output.

--dryRun=false # { dryRun: false }
--dryRun=False
--dryRun=FALSE
--dryRun=n
--dryRun=no
--dryRun=0

Negation and clearance

Having no argument prefix negates the Boolean value.

--noDryRun         # { dryRun: false }
--no-dry-run       # { dryRun: false }
--no-dry-run=false # { dryRun: true }

Having no argument prefix clears the string value.

--noOutputFileName    # { outputFileName: '' }
--no-output-file-name # { outputFileName: '' }

Having no argument prefix for an array removes the given value from the output array.

--exclude=file1 --exclude=file2 --no-exclude=file1
# { exclude: ['file2'] }

Duplicate-free guarantee

--exclude=file1 --exclude=file2 --exclude=file1
# { input: ['file2', 'file1'] }

Field aliases

parseArguments(
  process.argv.slice(2), 
  { dryRun: false },
  { aliases: { d: 'dryRun', commit: '!dryRun' } }
)
node myfile --dryRun # { dryRun: true }
node myfile -d       # { dryRun: true }

However, the below commands yield the opposite outputs because ! prefix negates the value from commit.

node myfile --commit    # { dryRun: false }
node myfile --noCommit  # { dryRun: true }
node myfile --no-commit # { dryRun: true }

Mutual exclusive fields

parseArguments(
  process.argv.slice(2), 
  {
    dryRun: false,
    confirmed: true,
  },
  {
    exclusives: [['dryRun', 'confirmed'], ...],
  }
)
--dryRun --confirmed
# Error: Unexpected mutual exclusive arguments: --dryRun --confirmed