feat: createError

Author: pi0

src/app.ts

@@ -1,7 +1,7 @@
 import type { IncomingMessage, ServerResponse } from 'http'
 import type { Stack, InputLayer, Handle, App, AppOptions } from './types'
 import { promisifyHandle } from './promisify'
-import { send, error, MIMES } from './utils'
+import { send, createError, error, MIMES } from './utils'
 
 export function createApp (options: AppOptions = {}): App {
   const stack: Stack = []
@@ -35,10 +35,7 @@ export function createApp (options: AppOptions = {}): App {
       }
     }
 
-    const error = new Error('Not found: ' + originalUrl)
-    // @ts-ignore
-    error.statusCode = 404
-    throw error
+    throw createError(404, 'Not Found')
   }
 
   const handle: Handle = function (req: IncomingMessage, res: ServerResponse) {

src/utils.ts

@@ -17,16 +17,29 @@ export function defaultContentType (res: ServerResponse, type: string) {
 }
 
 export function error (res: ServerResponse, error: Error | string, debug?: boolean, code?: number) {
-  code = code || (res.statusCode !== 200)
-    ? res.statusCode
+  res.statusCode = code ||
+    (res.statusCode !== 200 && res.statusCode) ||
     // @ts-ignore
-    : (error.status || error.statusCode || 500)
+    error.statusCode || error.status ||
+    500
 
-  if (debug && code !== 404) {
+  if (debug && res.statusCode !== 404) {
     console.error(error) // eslint-disable-line no-console
   }
 
-  res.end(`"Internal Error (${code})"`)
+  // @ts-ignore
+  res.statusMessage = res.statusMessage || error.statusMessage || error.statusText || 'Internal Error'
+
+  res.end(`"${res.statusMessage} (${res.statusCode})"`)
+}
+
+export function createError (statusCode: number, statusMessage: string) {
+  const err = new Error(statusMessage)
+  // @ts-ignore
+  err.statusCode = statusCode
+  // @ts-ignore
+  err.statusMessage = statusMessage
+  return err
 }
 
 export function redirect (res: ServerResponse, location: string, code = 302) {