codegraph/__tests__/fixtures/tail-render-ts/README.md

tail-render-ts — CG-38

An agent-named symbol sitting in the TAIL of a large file must render.

This mirrors the geometry of the reported file (a 1,414-line Svelte chat store) closely enough that the same two defects reproduce, and it is that geometry — not any individual line — that the fixture exists to hold:

	line	why it matters
QueuedMessage (interface)	70	the DECOY. Same stem as the query token, near the top, cheap to render — it is what the broken build returned instead of the functions.
createSessionStore (function)	104–1417	the ENVELOPE. Spans ~92% of the file, and function is deliberately not in ENVELOPE_KINDS (CG-27), so every symbol inside merges into ONE cluster that must then be shrunk and trimmed.
handleStreamMessage	~554	a 290-line god-method in the middle, so the head of the file has plenty to spend the budget on.
queueMessage	1088	TARGET. Past line 1,000.
removeQueuedMessage	1096	TARGET.
flushQueuedMessages	1102	TARGET. Past line 1,000.

Two more pieces are load-bearing:

• queueMessage never calls flushQueuedMessages (both push to / drain the same array instead). That absence is what produced no call chain, no synthesized hop and no dispatch boundary — and so made buildFlowFromNamedSymbols throw the named-symbol identity away along with the narrative it had nothing to print.
• types/worker-configuration.d.ts — 2,500 lines of generated Wrangler ambient types, carrying the Generated by wrangler. DO NOT EDIT. banner so the ranker flags and penalises it. It is what makes the fixture able to test the issue's index-dependence lead: a penalty on this file moves maxGraph, which moves the 6% relevance gate, which moves every other file's allowance — and must still not cost the top-ranked file the definitions the agent named.

src/lib/session-store.ts is machine-generated to hit those line numbers with real, extractable TypeScript. If you need to change it, change the geometry (the target line numbers, the closure span, the decoy's position) rather than editing individual lines — the fixture-shape assertions in __tests__/explore-named-symbol-render.test.ts will tell you if it has rotted.

Gate: __tests__/explore-named-symbol-render.test.ts. Probe: node scripts/agent-eval/probe-named-symbol.mjs. Numbers: docs/benchmarks/explore-tail-render-cg38.md.