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website/node_modules/npm/lib/install/report-optional-failure.js

@@ -0,0 +1,31 @@
+'use strict'
+var path = require('path')
+var moduleName = require('../utils/module-name.js')
+
+module.exports = reportOptionalFailure
+
+function top (tree) {
+  if (tree.parent) return top(tree.parent)
+  return tree
+}
+
+function reportOptionalFailure (tree, what, error) {
+  var topTree = top(tree)
+  if (!topTree.warnings) topTree.warnings = []
+  var id
+  if (what) {
+    var depVer = tree.package.dependencies && tree.package.dependencies[what]
+    var optDepVer = tree.package.optionalDependencies && tree.package.optionalDependencies[what]
+    var devDepVer = tree.package.devDependencies && tree.package.devDependencies[what]
+    var version = depVer || optDepVer || devDepVer
+    id = what + (version ? '@' + version : '')
+  } else {
+    id = tree._id || moduleName(tree) + (tree.package.version ? '@' + tree.package.version : '')
+  }
+  var location = path.relative(topTree.path, tree.path)
+  if (what) location = path.join(location, 'node_modules', what)
+
+  error.optional = id
+  error.location = location
+  topTree.warnings.push(error)
+}