update node_modules

node_modules/http-errors/index.js

@@ -25,6 +25,7 @@ var toIdentifier = require('toidentifier')
 
 module.exports = createError
 module.exports.HttpError = createHttpErrorConstructor()
+module.exports.isHttpError = createIsHttpErrorFunction(module.exports.HttpError)
 
 // Populate exports for all constructors
 populateConstructorExports(module.exports, statuses.codes, module.exports.HttpError)
@@ -130,7 +131,7 @@ function createHttpErrorConstructor () {
  */
 
 function createClientErrorConstructor (HttpError, name, code) {
-  var className = name.match(/Error$/) ? name : name + 'Error'
+  var className = toClassName(name)
 
   function ClientError (message) {
     // create the error object
@@ -172,13 +173,34 @@ function createClientErrorConstructor (HttpError, name, code) {
   return ClientError
 }
 
+/**
+ * Create function to test is a value is a HttpError.
+ * @private
+ */
+
+function createIsHttpErrorFunction (HttpError) {
+  return function isHttpError (val) {
+    if (!val || typeof val !== 'object') {
+      return false
+    }
+
+    if (val instanceof HttpError) {
+      return true
+    }
+
+    return val instanceof Error &&
+      typeof val.expose === 'boolean' &&
+      typeof val.statusCode === 'number' && val.status === val.statusCode
+  }
+}
+
 /**
  * Create a constructor for a server error.
  * @private
  */
 
 function createServerErrorConstructor (HttpError, name, code) {
-  var className = name.match(/Error$/) ? name : name + 'Error'
+  var className = toClassName(name)
 
   function ServerError (message) {
     // create the error object
@@ -264,3 +286,14 @@ function populateConstructorExports (exports, codes, HttpError) {
   exports["I'mateapot"] = deprecate.function(exports.ImATeapot,
     '"I\'mateapot"; use "ImATeapot" instead')
 }
+
+/**
+ * Get a class name from a name identifier.
+ * @private
+ */
+
+function toClassName (name) {
+  return name.substr(-5) !== 'Error'
+    ? name + 'Error'
+    : name
+}