How to use the npm-package-arg.resolve function in npm-package-arg

// dep link out of the edgesIn set.  Choose the edge with the fewest
    // number of `node_modules` sections in the requestor path, and then
    // lexically sort afterwards.
    const edge = [...node.edgesIn].filter(edge => edge.valid).sort((a, b) => {
      const aloc = a.from.location.split('node_modules')
      const bloc = b.from.location.split('node_modules')
      /* istanbul ignore next - sort calling order is indeterminate */
      return aloc.length > bloc.length ? 1
        : bloc.length > aloc.length ? -1
        : aloc[aloc.length - 1].localeCompare(bloc[bloc.length - 1])
    })[0]
    // if we don't have one, just an empty object so nothing matches below
    // This will effectively just save the version and resolved, as if it's
    // a standard version/range dep, which is a reasonable default.
    const spec = !edge ? {}
      : npa.resolve(node.name, edge.spec, edge.from.realpath)

    const rSpec = specFromResolved(node.resolved)

    if (node.target)
      lock.version = `file:${relpath(this.path, node.realpath)}`
    else if (spec && (spec.type === 'file' || spec.type === 'remote'))
      lock.version = spec.saveSpec
    else if (spec && spec.type === 'git' || rSpec && rSpec.type === 'git') {
      lock.version = node.resolved
      /* istanbul ignore else - don't think there are any cases where a git
       * spec (or indeed, ANY npa spec) doesn't have a .raw member */
      if (spec.raw)
        lock.from = spec.raw
    } else if (!node.isRoot &&
        node.package &&
        node.package.name &&

private async hasMismatchedPeer(manifest: PackageManifest): Promise {
    for (const peer in manifest.peerDependencies) {
      let peerIdentifier;
      try {
        peerIdentifier = npa.resolve(peer, manifest.peerDependencies[peer]);
      } catch {
        this.logger.warn(`Invalid peer dependency ${peer} found in package.`);
        continue;
      }

      if (peerIdentifier.type === 'version' || peerIdentifier.type === 'range') {
        try {
          const version = await this.findProjectVersion(peer);
          if (!version) {
            continue;
          }

          // tslint:disable-next-line:no-any
          const options = { includePrerelease: true } as any;

          if (

function childDependencySpecifier (tree, name, spec, where) {
  return npa.resolve(name, spec, where || packageRelativePath(tree))
}

return tree.forEachAsync((dep, next) => {
      if (!this.checkDepEnv(dep)) { return }
      const depPath = dep.path(this.prefix)
      const spec = npa.resolve(dep.name, dep.version, this.prefix)
      if (dep.isRoot) {
        return next()
      } else if (spec.type === 'directory') {
        const relative = path.relative(path.dirname(depPath), spec.fetchSpec)
        this.log.silly('extractTree', `${dep.name}@${spec.fetchSpec} -> ${depPath} (symlink)`)
        return mkdirp(path.dirname(depPath))
          .then(() => symlinkAsync(relative, depPath, 'junction'))
          .catch(
            () => rimraf(depPath)
              .then(() => symlinkAsync(relative, depPath, 'junction'))
          ).then(() => next())
          .then(() => {
            this.pkgCount++
            cg.completeWork(1)
          })
      } else {

function hasModernMeta (child) {
  if (!child) return false
  const resolved = child.package._resolved && npa.resolve(moduleName(child), child.package._resolved)
  const version = npa.resolve(moduleName(child), child.package.version)
  return child.isTop ||
    isLink(child) ||
    child.fromBundle || child.package._inBundle ||
    child.package._integrity || child.package._shasum ||
    (resolved && resolved.type === 'git') || (version && version.type === 'git')
}

var allDependencies = Object.keys(deps).map((dep) => {
        return npa.resolve(dep, deps[dep])
      }).filter((dep) => {
        return isRegistry(dep) &&

return unbuild([unpackTarget], true).then(() => {
    const opts = npmConfig({dmode, fmode, uid, gid, offline: true})
    return pacote.extract(npa.resolve(pkg, ver), unpackTarget, opts)
  })
}

return fs.stat(path.join(arg, 'package.json'), (err) => {
        if (err) {
          var version = matchingDep(tree, spec.name)
          if (version) {
            try {
              return fetchPackageMetadata(npa.resolve(spec.name, version), where, done)
            } catch (e) {
              return done(e)
            }
          } else {
            return fetchPackageMetadata(spec, where, done)
          }
        } else {
          try {
            return fetchPackageMetadata(npa('file:' + arg), where, done)
          } catch (e) {
            return done(e)
          }
        }
      })
    } else {

return tree.forEachAsync((dep, next) => {
      if (!this.checkDepEnv(dep)) { return }
      const spec = npa.resolve(dep.name, dep.version)
      const depPath = dep.path(this.prefix)
      return next()
        .then(() => readJson(depPath, 'package.json'))
        .then(pkg => (spec.registry || spec.type === 'directory')
          ? pkg
          : this.updateFromField(dep, pkg).then(() => pkg)
        )
        .then(pkg => (pkg.scripts && pkg.scripts.install)
          ? pkg
          : this.updateInstallScript(dep, pkg).then(() => pkg)
        )
        .tap(pkg => { pkgJsons.set(dep, pkg) })
    }, {concurrency: 100, Promise: BB})
      .then(() => pkgJsons)

      .then(from => npa.resolve(dep.name, from))
      .then(from => { pkg._from = from.toString() })