Expose a type that lists the AiAdapter for each format (#756)

## Summary
<!-- Succinctly describe your change, providing context, what you've
changed, and why. -->

Exposes an `AiAdapter` for each `AiAdapter.Format` such that downstream
packages can understand if parsers and typing is available and strictly
adhere to the latest definitions in this package.

## Checklist
<!-- Tick these items off as you progress. -->
<!-- If an item isn't applicable, ideally please strikeout the item by
wrapping it in "~~"" and suffix it with "N/A My reason for skipping
this." -->
<!-- e.g. "- [ ] ~~Added tests~~ N/A Only touches docs" -->

- [ ] ~Added a [docs PR](https://github.com/inngest/website) that
references this PR~ N/A Internal
- [ ] ~Added unit/integration tests~ N/A Internal typing
- [x] Added changesets if applicable

.changeset/warm-cameras-yell.md

@@ -0,0 +1,5 @@
+---
+"inngest": patch
+---
+
+Expose a type that lists the `AiAdapter` for each format

packages/inngest/src/components/ai/adapter.ts

@@ -1,3 +1,5 @@
+import { type OpenAiAiAdapter } from "./adapters/openai.js";
+
 /**
  * A symbol used internally to define the types for a model whilst keeping
  * generics clean. Must not be exported outside of this module.
@@ -60,7 +62,7 @@ export interface AiAdapter {
     /**
      * The model to use for the inference.
      */
-    model: this,
+    model: AiAdapter,
 
     /**
      * The input to pass to the model.
@@ -100,3 +102,15 @@ export namespace AiAdapter {
     TOutput extends AiAdapter,
   > = (...args: TInput) => TOutput;
 }
+
+/**
+ * A cheeky hack to ensure we account for all AI adapters.
+ */
+const adapters = {
+  "openai-chat": null as unknown as OpenAiAiAdapter,
+} satisfies Record<AiAdapter.Format, AiAdapter>;
+
+/**
+ * All AI adapters available for use.
+ */
+export type AiAdapters = typeof adapters;

packages/inngest/src/components/ai/index.ts

@@ -1,4 +1,4 @@
-export type { AiAdapter } from "./adapter.js";
+export type { AiAdapter, AiAdapters } from "./adapter.js";
 
 // Adapters
 export * from "./adapters/openai.js";