co-mono/packages/coding-agent/test/compaction-hooks-example.test.ts
Mario Zechner d6283f99dc refactor(hooks): split session events into individual typed events
Major changes:
- Replace monolithic SessionEvent with reason discriminator with individual
  event types: session_start, session_before_switch, session_switch,
  session_before_new, session_new, session_before_branch, session_branch,
  session_before_compact, session_compact, session_shutdown
- Each event has dedicated result type (SessionBeforeSwitchResult, etc.)
- HookHandler type now allows bare return statements (void in return type)
- HookAPI.on() has proper overloads for each event with correct typing

Additional fixes:
- AgentSession now always subscribes to agent in constructor (was only
  subscribing when external subscribe() called, breaking internal handlers)
- Standardize on undefined over null throughout codebase
- HookUIContext methods return undefined instead of null
- SessionManager methods return undefined instead of null
- Simplify hook exports to 'export type * from types.js'
- Add detailed JSDoc for skipConversationRestore vs cancel
- Fix createBranchedSession to rebuild index in persist mode
- newSession() now returns the session file path

Updated all example hooks, tests, and emission sites to use new event types.
2025-12-30 22:42:22 +01:00

68 lines
2.5 KiB
TypeScript

/**
* Verify the documentation example from hooks.md compiles and works.
*/
import { describe, expect, it } from "vitest";
import type { HookAPI, SessionBeforeCompactEvent, SessionCompactEvent } from "../src/core/hooks/index.js";
describe("Documentation example", () => {
it("custom compaction example should type-check correctly", () => {
// This is the example from hooks.md - verify it compiles
const exampleHook = (pi: HookAPI) => {
pi.on("session_before_compact", async (event: SessionBeforeCompactEvent, ctx) => {
// All these should be accessible on the event
const { preparation, previousCompactions, model } = event;
// sessionManager and modelRegistry come from ctx, not event
const { sessionManager, modelRegistry } = ctx;
const { messagesToSummarize, messagesToKeep, tokensBefore, firstKeptEntryId, cutPoint } = preparation;
// Get previous summary from most recent compaction
const _previousSummary = previousCompactions[0]?.summary;
// Verify types
expect(Array.isArray(messagesToSummarize)).toBe(true);
expect(Array.isArray(messagesToKeep)).toBe(true);
expect(typeof cutPoint.firstKeptEntryIndex).toBe("number");
expect(typeof tokensBefore).toBe("number");
expect(model).toBeDefined();
expect(typeof sessionManager.getEntries).toBe("function");
expect(typeof modelRegistry.getApiKey).toBe("function");
expect(typeof firstKeptEntryId).toBe("string");
const summary = messagesToSummarize
.filter((m) => m.role === "user")
.map((m) => `- ${typeof m.content === "string" ? m.content.slice(0, 100) : "[complex]"}`)
.join("\n");
// Hooks return compaction content - SessionManager adds id/parentId
return {
compaction: {
summary: `User requests:\n${summary}`,
firstKeptEntryId,
tokensBefore,
},
};
});
};
// Just verify the function exists and is callable
expect(typeof exampleHook).toBe("function");
});
it("compact event should have correct fields", () => {
const checkCompactEvent = (pi: HookAPI) => {
pi.on("session_compact", async (event: SessionCompactEvent) => {
// These should all be accessible
const entry = event.compactionEntry;
const fromHook = event.fromHook;
expect(entry.type).toBe("compaction");
expect(typeof entry.summary).toBe("string");
expect(typeof entry.tokensBefore).toBe("number");
expect(typeof fromHook).toBe("boolean");
});
};
expect(typeof checkCompactEvent).toBe("function");
});
});