npm-check-unused/lib/in/get-unused-packages.js

Check unused dependencies.

'use strict'

const depcheck = require('depcheck')
const ora = require('ora')
const _ = require('lodash')

function skipUnused (currentState) {
  return !currentState.get('cwdPackageJson').name // there's no package.json
}

function getSpecialParsers (currentState) {
  const specialsInput = currentState.get('specials')
  if (!specialsInput) return
  return specialsInput
    .split(',')
    .map((special) => depcheck.special[special])
    .filter(Boolean)
}

function checkUnused (currentState) {
  const spinner = ora(`Checking for unused packages.`)
  spinner.enabled = spinner.enabled && currentState.get('spinner')
  spinner.start()

  return new Promise(resolve => {
    if (skipUnused(currentState)) {
      resolve(currentState)
      return
    }

    const depCheckOptions = {
      ignoreDirs: [
        'sandbox',
        'dist',
        'generated',
        '.generated',
        'fixtures',
        'jspm_packages'
      ],
      ignoreMatches: [
        'gulp-*',
        'grunt-*',
        'karma-*',
        'angular-*',
        'babel-*',
        'metalsmith-*',
        'eslint-plugin-*',
        '@types/*',
        'grunt',
        'mocha',
        'ava'
      ],
      specials: getSpecialParsers(currentState)
    }

    depcheck(currentState.get('cwd'), depCheckOptions, resolve)
  }).then(depCheckResults => {
    spinner.stop()
    const unusedDependencies = [].concat(depCheckResults.dependencies, depCheckResults.devDependencies)
    currentState.set('unusedDependencies', unusedDependencies)

    const cwdPackageJson = currentState.get('cwdPackageJson')

    // currently missing will return devDependencies that aren't really missing
    const missingFromPackageJson = _.omit(depCheckResults.missing || {},
      Object.keys(cwdPackageJson.dependencies), Object.keys(cwdPackageJson.devDependencies))
    currentState.set('missingFromPackageJson', missingFromPackageJson)
    return currentState
  })
}

module.exports = checkUnused