Colby McHenry
9efae0f8f2
A file that declares nothing but types and that nothing in the index depends on — a hand-written ambient `.d.ts` of global shims, vendored typings, module augmentation — cannot answer a flow question: no bodies, no call edges, no behaviour, nothing typed by it. But the identifiers it declares are exactly the generic ones a prose question uses (`Body`, `Message`, `ImageMetadata`, `ReadableStream`), so on term overlap it out-scored the implementation. Measured on the new fixture: rank #1 and 51% of delivered source, with the flow's own entry file pushed out of the response entirely. Measured first, per the issue: the Wrangler `worker-configuration.d.ts` that opened this is already handled by CG-25's banner detection, worth 15-46 points of envelope share across four flow queries. CG-25 credited; only the un-bannered case needed anything. `rankPenalty` now multiplies score and graph mass by 0.5 for such files, taken as the STRONGER of it and the generated penalty rather than multiplied — one property two signals see must not be charged twice. Detection is structural, not by extension, and four conditions deep. Two of them were forced by measurement: requiring every symbol to be type-level takes the corpus flag rate from 1-18% (which swept in Kotlin sealed classes, Rust mod.rs re-exports and django's locale tables) down to 0-4%; requiring that nothing depends on the file separates an ambient shim from a working types module, and without it the rule demoted displacement-ts's pipeline `types.ts` and broke the CG-31 gate. A query that NAMES a declared type is exempt, so a question about a type still reaches its declaration at full weight. Precise tokens only, so "…the file body…" cannot exempt a `Body` interface it never meant to name; this needs its own set because `namedSeedIds` is callable-only and a type never becomes one. Regression evidence in docs/benchmarks/explore-declaration-only-cg28.md: 6-repo envelope sweep byte-identical against a clean baseline build, zero ambient files reach the candidate set on VS Code across five queries, corpus flag rate 0-0.74%, both allocation fixtures PASS, full suite 2,978 green. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
8 lines
219 B
JSON
8 lines
219 B
JSON
{
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"name": "ambient-decls-ts-fixture",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"description": "CG-28 fixture — declaration-only files competing with implementation for one explore envelope."
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}
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