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ng-eventually/.project/concepts/app-contract/knowledge_what-an-app-deletes-at-migration.md
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Sylvain Duchesne 2726f4a26f docs: nommer par la fonction, et n'annoncer qu'un point d'entrée
Deux corrections indépendantes dans la doc vivante, les briefs et décisions
datés restant tels qu'écrits.

P1a et P1b ne disaient rien à personne. Six mois plus tard il aurait fallu lire
le code pour savoir de quoi on parle, et le coût de la recherche se repaie à
chaque lecture. Ils deviennent cap-surface — la forme des capacités, livrée le
2026-07-28 — et cap-enforcement — ce qui reste : le chiffrement par document et
les gardes d'écriture aujourd'hui décoratives. 28 occurrences.

Et api-contract.md se contredisait à quatre lignes d'intervalle : il annonçait
deux points d'entrée en tête, et en bas qu'il n'y en a qu'un depuis la fusion du
2026-08-07. Vérifié dans package.json avant d'écrire — exports mappe exactement
{".": "./src/index.ts"} et src/polyfill.ts n'existe pas.

Ce qui identifie un symbole polyfill-era ne change pas : le bloc marqué dans
src/index.ts et le test de vocabulaire, plus aucun chemin d'import.
2026-08-11 19:10:34 +02:00

3.2 KiB

type, summary
type summary
knowledge The two fates a published symbol can have, and why the deletion list is now carried by a block and a test rather than by an import path

What an application deletes at migration, and what it keeps

Every published symbol has exactly one of two fates, and knowing which is the whole point of this boundary.

Replaced in place. The build alias resolving @ng-eventually/polyfill is removed, the import resolves to the real SDK, and the application's code is unchanged. This is almost everything: ng, useShape, watchShape, init, initNg, readUnion, subscribeDoc(s), docs.*, inbox.*, storeRegistry.*, and the types.

Deleted. The symbol has no counterpart at any level of the target, exists only because one shared wallet hosts every user, and goes with its call site. Today that is configure and its config type.

ensureIdentity sits between the two and is worth stating precisely: its substance is scaffolding — a barrier that hands out a shared wallet file and takes an identifier, a step that exists only because users share a wallet — while its call site survives, because an application still awaits a session before it renders. Its signature was designed for that: it takes no identifier, so the line does not change the day the wallet supplies the identity and the barrier stops appearing.

Why the deletion list is not an import path any more

There were two entries until 2026-08-07, . and ./polyfill, and the second one carried a signal worth naming: what you import from that path is exactly what you will delete. That was a mechanical guarantee — the compiler produced the list.

Merging them lost it. Nothing at an import line now distinguishes configure, which goes away, from docs, which is replaced. Three things carry it instead, and it is worth knowing that only the last two are enforced:

  • the POLYFILL-ERA block in the package's entry module, which is the deletion list, kept short by construction;
  • docs/api-contract.md, which rules on every symbol with an epistemic label (PASSTHROUGH / LEVEL-1 SHAPE / ASSUMPTION / NO COUNTERPART) and whose export inventory is pinned by a test — so it cannot go stale quietly, which a hand-kept list would;
  • the names themselves, each built from the target's own vocabulary or carrying a marker saying why it exists only here, pinned by the same test.

The trade was deliberate and it is a real reduction in enforcement: a documentary signal where a mechanical one used to be. To verify the pinning is doing its job, look for the vocabulary test beside the package's other tests — it compares the contract's inventory against the entry's real exports, in both directions, and it caught five drifted sections the day it was extended to the rulings.

The direction of travel

The polyfill-era list only shrinks. It has gone from four published calls to one, and each removal was a symbol an application should never have had: naming its own identity, awaiting the connection, wiring a second bootstrap, reaching a machinery accessor. A symbol added to that block is a promise to delete it later — so the question at every addition is whether the application genuinely needs it, or whether the library is passing on a problem of its own.