types: using generic type for request json parser (#97)

fastify · Aug 11, 2020 · 68fdf5a · 68fdf5a
1 parent 8a6d6ed
commit 68fdf5a
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Showing 2 changed files with 4 additions and 1 deletion.
diff --git a/index.d.ts b/index.d.ts
@@ -80,7 +80,7 @@ declare namespace LightMyRequest {
     trailers: { [key: string]: string }
     payload: string
     body: string
-    json: () => any
+    json: <T = any>() => T
     cookies: Array<object>
   }
 

diff --git a/test/index.test-d.ts b/test/index.test-d.ts
@@ -77,3 +77,6 @@ type ParsedValue = { field: string }
 const response: Response = await inject(dispatch)
 const parsedValue: ParsedValue = response.json()
 expectType<ParsedValue>(parsedValue)
+
+const parsedValueUsingGeneric = response.json<ParsedValue>()
+expectType<ParsedValue>(parsedValueUsingGeneric)