From 245aa6b68f5e4cf525eaa68f4719e883639f7650 Mon Sep 17 00:00:00 2001
From: ziga <zigomir@gmail.com>
Date: Wed, 27 Oct 2021 10:19:53 +0200
Subject: [PATCH] fix(nitro): type inference for api routes returning promise
 (#1483)

---
 packages/nitro/src/build.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/nitro/src/build.ts b/packages/nitro/src/build.ts
index 91086b5558..ff92986030 100644
--- a/packages/nitro/src/build.ts
+++ b/packages/nitro/src/build.ts
@@ -70,12 +70,13 @@ async function writeTypes (nitroContext: NitroContext) {
     if (typeof mw.handle !== 'string') { continue }
     const relativePath = relative(nitroContext._nuxt.buildDir, mw.handle).replace(/\.[a-z]+$/, '')
     routeTypes[mw.route] = routeTypes[mw.route] || []
-    routeTypes[mw.route].push(`ReturnType<typeof import('${relativePath}').default>`)
+    routeTypes[mw.route].push(`Awaited<ReturnType<typeof import('${relativePath}').default>>`)
   }
 
   const lines = [
     '// Generated by nitro',
     'declare module \'@nuxt/nitro\' {',
+    '  type Awaited<T> = T extends PromiseLike<infer U> ? Awaited<U> : T',
     '  interface InternalApi {',
     ...Object.entries(routeTypes).map(([path, types]) => `    '${path}': ${types.join(' | ')}`),
     '  }',