fetch polyfill and better package.json

mod.ts

@@ -30,6 +30,16 @@
  * );
  * ```
  *
+ * ## `fetch` API in Node.js
+ *
+ * Node.js v18 has a native browser-like fetch interface. Versions
+ * below are normally using [`node-fetch`](https://github.com/node-fetch/node-fetch)
+ * to circumvent this issue.
+ *
+ * For environments using Node v18 and earlier, Tpy uses the native
+ * fetch without requiring the package. Environments containing earlier
+ * versions of Node will require the package.
+ *
  * @module
  */
 

node/package.json

@@ -1,6 +1,6 @@
 {
   "name": "tpy",
-  "version": "v1.0.0-pre-release-4",
+  "version": "v1.0.0-pre-release-5",
   "description": "🔑 A strongly typed Pylon API client.",
   "license": "MIT",
   "type": "commonjs",
@@ -30,14 +30,17 @@
   "bugs": {
     "url": "https://github.com/insyri/tpy/issues"
   },
-  "dependencies": {
+  "peerDependencies": {
     "@types/node": "18.11.3",
-    "discord-api-types": "0.37.14"
+    "discord-api-types": "0.37.14",
+    "node-fetch": "3.2.10"
+  },
+  "peerDependenciesMeta": {
+    "node-fetch": {
+      "optional": true
+    }
   },
   "devDependencies": {
     "typescript": "4.8.4"
-  },
-  "optionalDependencies": {
-    "node-fetch": "3.2.10"
   }
 }

src/fetch_polyfill.ts

@@ -1,19 +1,13 @@
-import fetch, {
-  Blob,
-  blobFrom,
-  blobFromSync,
-  File,
-  fileFrom,
-  fileFromSync,
-  FormData,
-  Headers,
-  Request,
-  Response,
-} from 'node-fetch';
+// This file is meant to be read by Node.js, Deno stops at line 5.
+// If Deno extension enabled, ignore errors.
 
-if (!globalThis.fetch) {
-  Object.defineProperty(globalThis, 'fetch', fetch);
-  Object.defineProperty(globalThis, 'Headers', Headers);
-  Object.defineProperty(globalThis, 'Request', Request);
-  Object.defineProperty(globalThis, 'Response', Response);
+if (
+  'process' in globalThis && // If Node
+  Number(globalThis.process.version.substring(1, 3)) < 18
+) {
+  Object.defineProperty(
+    globalThis,
+    'fetch',
+    require('node-fetch'),
+  );
 }

src/tpy.ts

@@ -12,7 +12,7 @@ import TpyWs from './ws.ts';
 import TpyKV from './kv.ts';
 import Context from './context.ts';
 
-if (!Deno) await import('./fetch_polyfill.ts');
+import './fetch_polyfill.ts';
 
 /**
  * The central entity for interacting with the Pylon API; the entrypoint.