feat(ui): extend zod with a is typeguard` method

Feels dangerous, but it's very handy.

invokeai/frontend/web/src/extend-zod.ts

@@ -0,0 +1,8 @@
+import { assert } from 'tsafe';
+import { z } from 'zod';
+
+assert(!Object.hasOwn(z.ZodType.prototype, 'is'));
+
+z.ZodType.prototype.is = function (val: unknown): val is z.infer<typeof this> {
+  return this.safeParse(val).success;
+};

invokeai/frontend/web/src/main.tsx

@@ -1,3 +1,5 @@
+import 'extend-zod';
+
 import ReactDOM from 'react-dom/client';
 
 import InvokeAIUI from './app/components/InvokeAIUI';

invokeai/frontend/web/src/zod-extensions.d.ts

@@ -0,0 +1,8 @@
+import 'zod';
+
+declare module 'zod' {
+  /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+  export interface ZodType<Output = any> {
+    is(val: unknown): val is Output;
+  }
+}