fix: only log unhandled and fatal errors (nitrojs#407)

src/dev/server.ts

@@ -1,7 +1,7 @@
 import { Worker } from 'worker_threads'
 import { existsSync, promises as fsp } from 'fs'
 import { debounce } from 'perfect-debounce'
-import { App, createApp, eventHandler } from 'h3'
+import { App, createApp, eventHandler, H3Error } from 'h3'
 import httpProxy from 'http-proxy'
 import { listen, Listener, ListenOptions } from 'listhen'
 import { servePlaceholder } from 'serve-placeholder'
@@ -74,7 +74,7 @@ export function createDevServer (nitro: Nitro): NitroDevServer {
   // Error handler
   const errorHandler = nitro.options.devErrorHandler || defaultErrorHandler
 
-  let lastError: Error = null
+  let lastError: H3Error = null
   let reloadPromise: Promise<void> = null
 
   let currentWorker: NitroWorker = null

src/runtime/error.ts

@@ -26,8 +26,14 @@ export default <NitroErrorHandler> function (error, event) {
   }
 
   // Console output
-  if (statusCode !== 404) {
-    console.error('[nitro] [request error]', error.message + '\n' + stack.map(l => '  ' + l.text).join('  \n'))
+  if (error.unhandled || error.fatal) {
+    const tags = [
+      '[nitro]',
+      '[request error]',
+      error.unhandled && '[unhandled]',
+      error.fatal && '[fatal]'
+    ].filter(Boolean).join(' ')
+    console.error(tags, error.message + '\n' + stack.map(l => '  ' + l.text).join('  \n'))
   }
 
   event.res.statusCode = statusCode

src/types/handler.ts

@@ -1,4 +1,4 @@
-import type { Handler, CompatibilityEvent } from 'h3'
+import type { Handler, CompatibilityEvent, H3Error } from 'h3'
 
 export interface NitroEventHandler {
   /**
@@ -44,4 +44,4 @@ export interface NitroDevEventHandler {
   handler: Handler
 }
 
-export type NitroErrorHandler = (error: Error, event: CompatibilityEvent) => void | Promise<void>
+export type NitroErrorHandler = (error: H3Error, event: CompatibilityEvent) => void | Promise<void>