Add native LLM core foundation (#24712)

packages/llm/test/schema.test.ts

@@ -0,0 +1,58 @@
+import { describe, expect, test } from "bun:test"
+import { Schema } from "effect"
+import {
+  ContentPart,
+  LLMEvent,
+  LLMRequest,
+  ModelID,
+  ModelLimits,
+  ModelRef,
+  ProviderID,
+} from "../src/schema"
+
+const model = new ModelRef({
+  id: ModelID.make("fake-model"),
+  provider: ProviderID.make("fake-provider"),
+  route: "openai-chat",
+  baseURL: "https://fake.local",
+  limits: new ModelLimits({}),
+})
+
+describe("llm schema", () => {
+  test("decodes a minimal request", () => {
+    const input: unknown = {
+      id: "req_1",
+      model,
+      system: [{ type: "text", text: "You are terse." }],
+      messages: [{ role: "user", content: [{ type: "text", text: "hi" }] }],
+      tools: [],
+      generation: {},
+    }
+
+    const decoded = Schema.decodeUnknownSync(LLMRequest)(input)
+
+    expect(decoded.id).toBe("req_1")
+    expect(decoded.messages[0]?.content[0]?.type).toBe("text")
+  })
+
+  test("accepts custom route ids", () => {
+    const decoded = Schema.decodeUnknownSync(LLMRequest)({
+      model: { ...model, route: "custom-route" },
+      system: [],
+      messages: [],
+      tools: [],
+      generation: {},
+    })
+
+    expect(decoded.model.route).toBe("custom-route")
+  })
+
+  test("rejects invalid event type", () => {
+    expect(() => Schema.decodeUnknownSync(LLMEvent)({ type: "bogus" })).toThrow()
+  })
+
+  test("content part tagged union exposes guards", () => {
+    expect(ContentPart.guards.text({ type: "text", text: "hi" })).toBe(true)
+    expect(ContentPart.guards.media({ type: "text", text: "hi" })).toBe(false)
+  })
+})