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js/src/llm/llm.ts

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+import { App } from "../app";
+import { Log } from "../util/log";
+
+import { createAnthropic } from "@ai-sdk/anthropic";
+import type { LanguageModel, Provider } from "ai";
+import { generateText, NoSuchModelError } from "ai";
+
+export namespace LLM {
+  const log = Log.create({ service: "llm" });
+
+  export class ModelNotFoundError extends Error {
+    constructor(public readonly model: string) {
+      super();
+    }
+  }
+
+  const state = App.state("llm", async (app) => {
+    const providers: Provider[] = [];
+
+    if (process.env["ANTHROPIC_API_KEY"] || app.config.providers?.anthropic) {
+      log.info("loaded anthropic");
+      const provider = createAnthropic({
+        apiKey: app.config.providers?.anthropic?.apiKey,
+        baseURL: app.config.providers?.anthropic?.baseURL,
+        headers: app.config.providers?.anthropic?.headers,
+      });
+      providers.push(provider);
+    }
+
+    return {
+      models: new Map<string, LanguageModel>(),
+      providers,
+    };
+  });
+
+  export async function providers() {
+    return state().then((state) => state.providers);
+  }
+
+  export async function findModel(model: string) {
+    const s = await state();
+    if (s.models.has(model)) {
+      return s.models.get(model)!;
+    }
+    log.info("loading", { model });
+    for (const provider of s.providers) {
+      try {
+        const match = provider.languageModel(model);
+        log.info("found", { model });
+        s.models.set(model, match);
+        return match;
+      } catch (e) {
+        if (e instanceof NoSuchModelError) continue;
+        throw e;
+      }
+    }
+    throw new ModelNotFoundError(model);
+  }
+}