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website/node_modules/npm/lib/install/validate-args.js

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+'use strict'
+var validate = require('aproba')
+var asyncMap = require('slide').asyncMap
+var chain = require('slide').chain
+var npmInstallChecks = require('npm-install-checks')
+var iferr = require('iferr')
+var checkEngine = npmInstallChecks.checkEngine
+var checkPlatform = npmInstallChecks.checkPlatform
+var npm = require('../npm.js')
+
+module.exports = function (idealTree, args, next) {
+  validate('OAF', arguments)
+  var force = npm.config.get('force')
+
+  asyncMap(args, function (pkg, done) {
+    chain([
+      [hasMinimumFields, pkg],
+      [checkSelf, idealTree, pkg, force],
+      [isInstallable, pkg]
+    ], done)
+  }, next)
+}
+
+function hasMinimumFields (pkg, cb) {
+  if (pkg.name === '' || pkg.name == null) {
+    return cb(new Error(`Can't install ${pkg._resolved}: Missing package name`))
+  } else if (pkg.version === '' || pkg.version == null) {
+    return cb(new Error(`Can't install ${pkg._resolved}: Missing package version`))
+  } else {
+    return cb()
+  }
+}
+
+function getWarnings (pkg) {
+  while (pkg.parent) pkg = pkg.parent
+  if (!pkg.warnings) pkg.warnings = []
+  return pkg.warnings
+}
+
+var isInstallable = module.exports.isInstallable = function (pkg, next) {
+  var force = npm.config.get('force')
+  var nodeVersion = npm.config.get('node-version')
+  if (/-/.test(nodeVersion)) {
+    // for the purposes of validation, if the node version is a prerelease,
+    // strip that. We check and warn about this sceanrio over in validate-tree.
+    nodeVersion = nodeVersion.replace(/-.*/, '')
+  }
+  var strict = npm.config.get('engine-strict')
+  checkEngine(pkg, npm.version, nodeVersion, force, strict, iferr(next, thenWarnEngineIssues))
+  function thenWarnEngineIssues (warn) {
+    if (warn) getWarnings(pkg).push(warn)
+    checkPlatform(pkg, force, next)
+  }
+}
+
+function checkSelf (idealTree, pkg, force, next) {
+  if (idealTree.package && idealTree.package.name !== pkg.name) return next()
+  if (force) {
+    var warn = new Error("Wouldn't install " + pkg.name + ' as a dependency of itself, but being forced')
+    warn.code = 'ENOSELF'
+    idealTree.warnings.push(warn)
+    next()
+  } else {
+    var er = new Error('Refusing to install package with name "' + pkg.name +
+     '" under a package\n' +
+     'also called "' + pkg.name + '". Did you name your project the same\n' +
+     'as the dependency you\'re installing?\n\n' +
+     'For more information, see:\n' +
+     '    <https://docs.npmjs.com/cli/install#limitations-of-npms-install-algorithm>')
+    er.code = 'ENOSELF'
+    next(er)
+  }
+}