Add typed JSON.stringify

examples/fetch.ts

@@ -1,23 +1,34 @@
 import { PathMap } from "./spec";
 import { TFetch } from "../src";
+import { JSON$stringifyT } from "../src/json";
+import { unreachable } from "../src/utils";
 
 const fetchT = fetch as TFetch<typeof origin, PathMap>;
 const origin = "http://localhost:3000";
 const headers = { "Content-Type": "application/json" };
+// stringify is same as JSON.stringify but with type information
+const stringify = JSON.stringify as JSON$stringifyT;
 
 const main = async () => {
   {
     const path = `${origin}/users`;
     const method = "get";
     const res = await fetchT(path, { method });
-    if (res.ok) {
-      // r is the response schema defined in pathMap["/users"]["get"].res["20X"]
-      const r = await res.json();
-      console.log(`${path}:${method} => ${r.userNames}`);
-    } else {
-      // e is the response schema defined in pathMap["/users"]["get"].res other than "20X"
-      const e = await res.json();
-      console.log(`${path}:${method} => ${e.errorMessage}`);
+    switch (res.status) {
+      case 200: {
+        // r is the response schema defined in pathMap["/users"]["get"].res["200"]
+        const r = await res.json();
+        console.log(`${path}:${method} => ${r.userNames}`);
+        break;
+      }
+      case 400: {
+        // e is the response schema defined in pathMap["/users"]["get"].res["400"]
+        const e = await res.json();
+        console.log(`${path}:${method} => ${e.errorMessage}`);
+        break;
+      }
+      default:
+        unreachable(res);
     }
   }
 
@@ -44,8 +55,9 @@ const main = async () => {
     const res = await fetchT(path, {
       method,
       headers,
-      // TODO: Add type information for body
-      body: JSON.stringify({ userName: "user1" }),
+      // body is the request schema defined in pathMap["/users"]["post"].body
+      // stringify is same as JSON.stringify but with type information
+      body: stringify({ userName: "user1" }),
     });
     if (res.ok) {
       // r is the response schema defined in pathMap["/users"]["post"].res["20X"]