refactor: le paquet s'appelle polyfill, « SDK » désigne celui de NextGraph
Le nom @ng-eventually/sdk entrait en collision avec le SDK de NextGraph, dont ce paquet est justement un polyfill. Impossible d'écrire « le SDK » sans lever l'ambiguïté à chaque phrase — et le contrat publié, lu par une application, était le pire endroit pour laisser traîner ça. packages/sdk → packages/polyfill, @ng-eventually/sdk → @ng-eventually/polyfill, contract_sdk-surface → contract_polyfill-surface, e2e/sdk-entry.ts → e2e/polyfill-entry.ts, docs/sdk-reference.md → docs/polyfill-reference.md. Les occurrences de « SDK » qui désignent celui de NextGraph restent intactes, y compris les chemins dans nextgraph-rs (sdk/js/orm, sdk/js/web). Le tri s'est fait occurrence par occurrence, pas par substitution. Le contrat énonce désormais son identité en une phrase : « This package is a polyfill of NextGraph's SDK. »
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Sylvain Duchesne
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# @ng-eventually/polyfill
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One entry point. Most of what it publishes has the same signature as the future SDK —
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`ng`, `useShape`, `watchShape`, `docs`, `inbox`, `storeRegistry`, `readUnion` (+ types) —
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and is a drop-in for `@ng-org/web` / `@ng-org/orm`: as NextGraph matures it resolves to
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the real SDK (build alias removed) with no code change.
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**One call does not, and it is the whole of what you will delete:** `configure`. It
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exists because one shared wallet hosts every user; upstream, an application imports the
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SDK and each user opens their own wallet. `src/index.ts` groups it under a heading that
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says so. (`ensureIdentity` is a second in substance — the shared-wallet gate — but its
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call site survives: an application still awaits a session before it renders.)
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*(There were two entry points until 2026-08-07, `.` and `./polyfill`, and the second one
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WAS that list. One door is easier to import from and says less — hence the grouping, and
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hence `docs/api-contract.md`, whose export inventory a test keeps honest.)*
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Per-symbol, with the target signature and an epistemic label on every claim:
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[`docs/api-contract.md`](../../docs/api-contract.md).
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> **Reading is key possession, and the isolation here is still fake.** The cap surface
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> has the shape of the real model — you hold a document's `ReadCap` or you do not read
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> it, and there is no authorization list anywhere — but nothing is encrypted yet and
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> the stand-in key is a constant. Nothing this library does may be described as
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> "anonymous" or "private" until per-document encryption lands (P1b).
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```ts
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import {
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// SDK-shaped — the real SDK replaces these in place.
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ensureIdentity, storeRegistry, inbox, readUnion, docs,
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// Polyfill-era — one call, and it is the whole of what goes away.
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configure,
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} from "@ng-eventually/polyfill";
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configure({ ng: realNg, useShape: realUseShape, getSession, sharedWallet });
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await ensureIdentity(); // who I am (returned), connection work awaited
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const doc = await storeRegistry.createEntityDoc("protected");
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await docs.sparqlUpdate(sid, `INSERT DATA { … }`, doc);
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const subjects = await readUnion(await storeRegistry.listMyEntityDocs("protected"));
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```
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## Principle — the polyfill compensates, it never extends
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**Its only reason to exist is to bridge a NextGraph implementation gap.** Every
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non-SDK surface must map to something NextGraph will provide natively, and must fall
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away at that point — no bespoke features, no observability, no convenience API that
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isn't strictly *"NextGraph will do this later"*. The test for any proposed addition:
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*does it compensate a real, exhibited gap?* If not, it belongs in the consumer
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application. And a compensation whose gap is not actually exhibited on the target
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broker is dead weight, not defensive code.
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Both halves are binding — **the surface AND the implementation** stay as close as
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possible to what NextGraph plans. The question to ask at every choice: *would this
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make a caller learn something it has to UNLEARN at migration?* If yes, it is a
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deviation, whatever it buys.
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What the polyfill adds, each emulated now and native later:
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- **Shared-wallet identity** — one wallet hosts every user, so the library fabricates
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*virtual users* and confines every access to the connected one
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(`emulated-verifier/reach.ts`). Upstream, each user opens their own wallet.
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- **Capability emulation** — per-identity cap possession plus a read filter over it:
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you read the documents whose cap you hold. There is no authorization list, because
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the real model has none.
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- **Inbox** — `post`, `postToDocument`, `share`, and the recipient's processing.
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The model is verified (an inbox is a keypair on one repo); no JS surface exists yet.
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Generic by construction: no application domain here. See
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[`examples/notebook`](../../examples/notebook) for an application written against it,
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which the e2e suite drives.
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## How a document is reached — the three acts, and no others
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```ts
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import { storeRegistry, inbox, readUnion } from "@ng-eventually/polyfill";
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// 1. CREATE — you hold its cap, with nothing to declare. No identity parameter: a
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// session belongs to one user, exactly as the target's own `doc_create` assumes.
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const doc = await storeRegistry.createEntityDoc("protected");
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// 2. GIVE TO READ — name the document and the person. The key is looked up and
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// sealed into a deposit; the recipient applies it by connecting, with nothing
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// to call. Irreversible: there is no revoking a key already handed out.
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await inbox.share(doc, "bob");
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// 3. CIRCULATE THE REFERENCE — no call at all. Every reference this surface returns
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// is BARE: it names the document and grants nothing. If the document sits in a
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// PUBLIC store, the store serves its read cap to whoever asks, so the bare
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// reference is enough to read it — and if it does not, the reference still names
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// it and opens nothing.
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const publicDoc = await storeRegistry.createEntityDoc("public");
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// …put `publicDoc` in a QR code, a message, another document. Nothing else to do.
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await readUnion([publicDoc]); // a stranger holding only this reads it
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```
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**The invariant behind all three: you never derive a cap from a bare reference.** You
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look it up in what you hold, you were given it, or a public store served it. A
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`did:ng:o:…` without `:r:` names a document and opens nothing — which is what makes
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confidentiality composable: a widely circulated document may point at a restricted
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one, and following the reference gets you a name, not a key. See
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[`docs/readcap-and-nuri-model.md`](../../docs/readcap-and-nuri-model.md) § 0.
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## The types carry that invariant
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`Nuri` and `ReadCap` are **template literal types**, not `string` aliases:
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```ts
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type Nuri = `did:ng:${string}`
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type ReadCap = `did:ng:${string}:r:${string}`
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```
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They are still strings — assignable to `string`, JSON-serializable, no wrapper — but
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the distinction is checked. A `ReadCap` goes wherever a `Nuri` is expected (a cap *is*
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a NURI with the key inside); the reverse does not compile.
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**Permissive in, precise out.** Public entries take `NuriLike` (`Nuri | string`) and
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validate at the door, so a value coming from storage, a URL or a form needs no
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narrowing and no cast on your side; what they *return* is a precise `Nuri`. The
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runtime checks stay regardless — a JavaScript caller never meets the compiler.
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```ts
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const saved = localStorage.getItem("doc"); // string | null
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if (saved) await readUnion([saved]); // ✓ validated at the door
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```
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