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?? access.js(6.08 KB)
?? adduser.js(1.32 KB)
?? audit.js(13.86 KB)
?? bugs.js(815 B)
?? cache.js(7.07 KB)
?? ci.js(3.51 KB)
?? completion.js(8.73 KB)
?? config.js(10.04 KB)
?? dedupe.js(1.4 KB)
?? deprecate.js(2.03 KB)
?? diff.js(8.12 KB)
?? dist-tag.js(5.45 KB)
?? docs.js(447 B)
?? doctor.js(11.51 KB)
?? edit.js(2 KB)
?? exec.js(2.54 KB)
?? explain.js(3.55 KB)
?? explore.js(2.3 KB)
?? find-dupes.js(622 B)
?? fund.js(6.51 KB)
?? get.js(524 B)
?? help-search.js(5.49 KB)
?? help.js(3.54 KB)
?? hook.js(3.77 KB)
?? init.js(6.9 KB)
?? install-ci-test.js(373 B)
?? install-test.js(370 B)
?? install.js(5.11 KB)
?? link.js(5.15 KB)
?? ll.js(234 B)
?? login.js(1.32 KB)
?? logout.js(1.3 KB)
?? ls.js(16.73 KB)
?? org.js(4.14 KB)
?? outdated.js(8.76 KB)
?? owner.js(5.91 KB)
?? pack.js(2.37 KB)
?? ping.js(917 B)
?? pkg.js(3.5 KB)
?? prefix.js(303 B)
?? profile.js(11.19 KB)
?? prune.js(779 B)
?? publish.js(6.5 KB)
?? query.js(2.9 KB)
?? rebuild.js(2.14 KB)
?? repo.js(1.24 KB)
?? restart.js(310 B)
?? root.js(258 B)
?? run-script.js(6.81 KB)
?? search.js(2.68 KB)
?? set.js(572 B)
?? shrinkwrap.js(2.64 KB)
?? star.js(1.87 KB)
?? stars.js(1.03 KB)
?? start.js(300 B)
?? stop.js(295 B)
?? team.js(4.44 KB)
?? test.js(295 B)
?? token.js(6.64 KB)
?? uninstall.js(1.51 KB)
?? unpublish.js(4.54 KB)
?? unstar.js(182 B)
?? update.js(1.71 KB)
?? version.js(3.58 KB)
?? view.js(14.38 KB)
?? whoami.js(474 B)

Editing: diff.js

const { resolve } = require('path')
const semver = require('semver')
const libnpmdiff = require('libnpmdiff')
const npa = require('npm-package-arg')
const Arborist = require('@npmcli/arborist')
const pacote = require('pacote')
const pickManifest = require('npm-pick-manifest')
const log = require('../utils/log-shim')
const readPackage = require('read-package-json-fast')
const BaseCommand = require('../base-command.js')

class Diff extends BaseCommand {
  static description = 'The registry diff command'
  static name = 'diff'
  static usage = [
    '[...<paths>]',
  ]

static params = [
    'diff',
    'diff-name-only',
    'diff-unified',
    'diff-ignore-all-space',
    'diff-no-prefix',
    'diff-src-prefix',
    'diff-dst-prefix',
    'diff-text',
    'global',
    'tag',
    'workspace',
    'workspaces',
    'include-workspace-root',
  ]

static workspaces = true
  static ignoreImplicitWorkspace = false

async exec (args) {
    const specs = this.npm.config.get('diff').filter(d => d)
    if (specs.length > 2) {
      throw this.usageError(`Can't use more than two --diff arguments.`)
    }

// execWorkspaces may have set this already
    if (!this.prefix) {
      this.prefix = this.npm.prefix
    }

// this is the "top" directory, one up from node_modules
    // in global mode we have to walk one up from globalDir because our
    // node_modules is sometimes under ./lib, and in global mode we're only ever
    // walking through node_modules (because we will have been given a package
    // name already)
    if (this.npm.global) {
      this.top = resolve(this.npm.globalDir, '..')
    } else {
      this.top = this.prefix
    }

const [a, b] = await this.retrieveSpecs(specs)
    log.info('diff', { src: a, dst: b })

const res = await libnpmdiff([a, b], {
      ...this.npm.flatOptions,
      diffFiles: args,
      where: this.top,
    })
    return this.npm.output(res)
  }

async execWorkspaces (args) {
    await this.setWorkspaces()
    for (const workspacePath of this.workspacePaths) {
      this.top = workspacePath
      this.prefix = workspacePath
      await this.exec(args)
    }
  }

// get the package name from the packument at `path`
  // throws if no packument is present OR if it does not have `name` attribute
  async packageName (path) {
    let name
    try {
      const pkg = await readPackage(resolve(this.prefix, 'package.json'))
      name = pkg.name
    } catch (e) {
      log.verbose('diff', 'could not read project dir package.json')
    }

if (!name) {
      throw this.usageError('Needs multiple arguments to compare or run from a project dir.')
    }

return name
  }

async retrieveSpecs ([a, b]) {
    if (a && b) {
      const specs = await this.convertVersionsToSpecs([a, b])
      return this.findVersionsByPackageName(specs)
    }

// no arguments, defaults to comparing cwd
    // to its latest published registry version
    if (!a) {
      const pkgName = await this.packageName(this.prefix)
      return [
        `${pkgName}@${this.npm.config.get('tag')}`,
        `file:${this.prefix.replace(/#/g, '%23')}`,
      ]
    }

// single argument, used to compare wanted versions of an
    // installed dependency or to compare the cwd to a published version
    let noPackageJson
    let pkgName
    try {
      const pkg = await readPackage(resolve(this.prefix, 'package.json'))
      pkgName = pkg.name
    } catch (e) {
      log.verbose('diff', 'could not read project dir package.json')
      noPackageJson = true
    }

const missingPackageJson =
      this.usageError('Needs multiple arguments to compare or run from a project dir.')

// using a valid semver range, that means it should just diff
    // the cwd against a published version to the registry using the
    // same project name and the provided semver range
    if (semver.validRange(a)) {
      if (!pkgName) {
        throw missingPackageJson
      }
      return [
        `${pkgName}@${a}`,
        `file:${this.prefix.replace(/#/g, '%23')}`,
      ]
    }

// when using a single package name as arg and it's part of the current
    // install tree, then retrieve the current installed version and compare
    // it against the same value `npm outdated` would suggest you to update to
    const spec = npa(a)
    if (spec.registry) {
      let actualTree
      let node
      try {
        const opts = {
          ...this.npm.flatOptions,
          path: this.top,
        }
        const arb = new Arborist(opts)
        actualTree = await arb.loadActual(opts)
        node = actualTree &&
          actualTree.inventory.query('name', spec.name)
            .values().next().value
      } catch (e) {
        log.verbose('diff', 'failed to load actual install tree')
      }

if (!node || !node.name || !node.package || !node.package.version) {
        if (noPackageJson) {
          throw missingPackageJson
        }
        return [
          `${spec.name}@${spec.fetchSpec}`,
          `file:${this.prefix.replace(/#/g, '%23')}`,
        ]
      }

const tryRootNodeSpec = () =>
        (actualTree && actualTree.edgesOut.get(spec.name) || {}).spec

const tryAnySpec = () => {
        for (const edge of node.edgesIn) {
          return edge.spec
        }
      }

const aSpec = `file:${node.realpath.replace(/#/g, '%23')}`

// finds what version of the package to compare against, if a exact
      // version or tag was passed than it should use that, otherwise
      // work from the top of the arborist tree to find the original semver
      // range declared in the package that depends on the package.
      let bSpec
      if (spec.rawSpec !== '*') {
        bSpec = spec.rawSpec
      } else {
        const bTargetVersion =
          tryRootNodeSpec()
          || tryAnySpec()

// figure out what to compare against,
        // follows same logic to npm outdated "Wanted" results
        const packument = await pacote.packument(spec, {
          ...this.npm.flatOptions,
          preferOnline: true,
        })
        bSpec = pickManifest(
          packument,
          bTargetVersion,
          { ...this.npm.flatOptions }
        ).version
      }

return [
        `${spec.name}@${aSpec}`,
        `${spec.name}@${bSpec}`,
      ]
    } else if (spec.type === 'directory') {
      return [
        `file:${spec.fetchSpec.replace(/#/g, '%23')}`,
        `file:${this.prefix.replace(/#/g, '%23')}`,
      ]
    } else {
      throw this.usageError(`Spec type ${spec.type} not supported.`)
    }
  }

async convertVersionsToSpecs ([a, b]) {
    const semverA = semver.validRange(a)
    const semverB = semver.validRange(b)

// both specs are semver versions, assume current project dir name
    if (semverA && semverB) {
      let pkgName
      try {
        const pkg = await readPackage(resolve(this.prefix, 'package.json'))
        pkgName = pkg.name
      } catch (e) {
        log.verbose('diff', 'could not read project dir package.json')
      }

if (!pkgName) {
        throw this.usageError('Needs to be run from a project dir in order to diff two versions.')
      }

return [`${pkgName}@${a}`, `${pkgName}@${b}`]
    }

// otherwise uses the name from the other arg to
    // figure out the spec.name of what to compare
    if (!semverA && semverB) {
      return [a, `${npa(a).name}@${b}`]
    }

if (semverA && !semverB) {
      return [`${npa(b).name}@${a}`, b]
    }

// no valid semver ranges used
    return [a, b]
  }

async findVersionsByPackageName (specs) {
    let actualTree
    try {
      const opts = {
        ...this.npm.flatOptions,
        path: this.top,
      }
      const arb = new Arborist(opts)
      actualTree = await arb.loadActual(opts)
    } catch (e) {
      log.verbose('diff', 'failed to load actual install tree')
    }

return specs.map(i => {
      const spec = npa(i)
      if (spec.rawSpec !== '*') {
        return i
      }

const node = actualTree
        && actualTree.inventory.query('name', spec.name)
          .values().next().value

const res = !node || !node.package || !node.package.version
        ? spec.fetchSpec
        : `file:${node.realpath.replace(/#/g, '%23')}`

return `${spec.name}@${res}`
    })
  }
}

module.exports = Diff

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Editing: diff.js

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