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EDIT :: add-rm-pkg-deps.js

// add and remove dependency specs to/from pkg manifest

const log = require('proc-log')
const localeCompare = require('@isaacs/string-locale-compare')('en')

const add = ({ pkg, add, saveBundle, saveType }) => {
  for (const { name, rawSpec } of add) {
    let addSaveType = saveType
    // if the user does not give us a type, we infer which type(s)
    // to keep based on the same order of priority we do when
    // building the tree as defined in the _loadDeps method of
    // the node class.
    if (!addSaveType) {
      addSaveType = inferSaveType(pkg, name)
    }

if (addSaveType === 'prod') {
      // a production dependency can only exist as production (rpj ensures it
      // doesn't coexist w/ optional)
      deleteSubKey(pkg, 'devDependencies', name, 'dependencies')
      deleteSubKey(pkg, 'peerDependencies', name, 'dependencies')
    } else if (addSaveType === 'dev') {
      // a dev dependency may co-exist as peer, or optional, but not production
      deleteSubKey(pkg, 'dependencies', name, 'devDependencies')
    } else if (addSaveType === 'optional') {
      // an optional dependency may co-exist as dev (rpj ensures it doesn't
      // coexist w/ prod)
      deleteSubKey(pkg, 'peerDependencies', name, 'optionalDependencies')
    } else { // peer or peerOptional is all that's left
      // a peer dependency may coexist as dev
      deleteSubKey(pkg, 'dependencies', name, 'peerDependencies')
      deleteSubKey(pkg, 'optionalDependencies', name, 'peerDependencies')
    }

const depType = saveTypeMap.get(addSaveType)

pkg[depType] = pkg[depType] || {}
    if (rawSpec !== '' || pkg[depType][name] === undefined) {
      pkg[depType][name] = rawSpec || '*'
    }
    if (addSaveType === 'optional') {
      // Affordance for previous npm versions that require this behaviour
      pkg.dependencies = pkg.dependencies || {}
      pkg.dependencies[name] = pkg.optionalDependencies[name]
    }

if (addSaveType === 'peer' || addSaveType === 'peerOptional') {
      const pdm = pkg.peerDependenciesMeta || {}
      if (addSaveType === 'peer' && pdm[name] && pdm[name].optional) {
        pdm[name].optional = false
      } else if (addSaveType === 'peerOptional') {
        pdm[name] = pdm[name] || {}
        pdm[name].optional = true
        pkg.peerDependenciesMeta = pdm
      }
      // peerDeps are often also a devDep, so that they can be tested when
      // using package managers that don't auto-install peer deps
      if (pkg.devDependencies && pkg.devDependencies[name] !== undefined) {
        pkg.devDependencies[name] = pkg.peerDependencies[name]
      }
    }

if (saveBundle && addSaveType !== 'peer' && addSaveType !== 'peerOptional') {
      // keep it sorted, keep it unique
      const bd = new Set(pkg.bundleDependencies || [])
      bd.add(name)
      pkg.bundleDependencies = [...bd].sort(localeCompare)
    }
  }

return pkg
}

// Canonical source of both the map between saveType and where it correlates to
// in the package, and the names of all our dependencies attributes
const saveTypeMap = new Map([
  ['dev', 'devDependencies'],
  ['optional', 'optionalDependencies'],
  ['prod', 'dependencies'],
  ['peerOptional', 'peerDependencies'],
  ['peer', 'peerDependencies'],
])

// Finds where the package is already in the spec and infers saveType from that
const inferSaveType = (pkg, name) => {
  for (const saveType of saveTypeMap.keys()) {
    if (hasSubKey(pkg, saveTypeMap.get(saveType), name)) {
      if (
        saveType === 'peerOptional' &&
        (!hasSubKey(pkg, 'peerDependenciesMeta', name) ||
        !pkg.peerDependenciesMeta[name].optional)
      ) {
        return 'peer'
      }
      return saveType
    }
  }
  return 'prod'
}

const hasSubKey = (pkg, depType, name) => {
  return pkg[depType] && Object.prototype.hasOwnProperty.call(pkg[depType], name)
}

// Removes a subkey and warns about it if it's being replaced
const deleteSubKey = (pkg, depType, name, replacedBy) => {
  if (hasSubKey(pkg, depType, name)) {
    if (replacedBy) {
      log.warn('idealTree', `Removing ${depType}.${name} in favor of ${replacedBy}.${name}`)
    }
    delete pkg[depType][name]

// clean up peerDepsMeta if we are removing something from peerDependencies
    if (depType === 'peerDependencies' && pkg.peerDependenciesMeta) {
      delete pkg.peerDependenciesMeta[name]
      if (!Object.keys(pkg.peerDependenciesMeta).length) {
        delete pkg.peerDependenciesMeta
      }
    }

if (!Object.keys(pkg[depType]).length) {
      delete pkg[depType]
    }
  }
}

const rm = (pkg, rm) => {
  for (const depType of new Set(saveTypeMap.values())) {
    for (const name of rm) {
      deleteSubKey(pkg, depType, name)
    }
  }
  if (pkg.bundleDependencies) {
    pkg.bundleDependencies = pkg.bundleDependencies
      .filter(name => !rm.includes(name))
    if (!pkg.bundleDependencies.length) {
      delete pkg.bundleDependencies
    }
  }
  return pkg
}

module.exports = { add, rm, saveTypeMap, hasSubKey }

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// SYSTEM PANEL //

EDIT :: add-rm-pkg-deps.js