Suppression

Documentation from vllnt/convex-suppression, recorded October 23, 2026. APIs and setup may differ in the Bijection adaptation.

@vllnt/convex-suppression

The do-not-contact suppression list + opt-in proof, as a Convex component.

Copy codeconst dnc = new Suppression(components.suppression);
await dnc.suppress(ctx, contactHash, "complaint", { channel: "email" });
const canSend = await dnc.isEligible(ctx, contactHash, { channel: "email" });

The GDPR opt-out / CAN-SPAM primitive: a global do-not-contact list keyed by an opaque contactHash (never raw PII, so it survives erasure) plus an opt-in proof ledger. Before every send the host asks isEligible; an unsubscribe / bounce / complaint calls suppress; a double-opt-in confirmation calls recordOptIn. Domain-neutral — channels and reasons are the host's.

Features

• Hash-keyed, erasure-surviving — stores only the opaque contactHash, never raw PII, so a tombstone outlives erasure of the subject.
• Channel-aware — scope a suppression to one channel ("email"/"sms"/"push"), or omit channel for a global all-channel tombstone.
• One send gate — isEligible answers ¬suppressed [∧ confirmed] in one call; suppression always blocks, opt-in is per call.
• Opt-in proof ledger — recordOptIn / getOptInProof store legal proof-of-consent per list, kept separate from any authz store.
• Idempotent — re-suppressing / re-recording on its key tuple updates in place, so a replayed webhook never duplicates a row.
• Typed, opaque proof — Suppression<TProof> with an optional proofValidator narrows the stored evidence at the boundary.
• Server-sourced time — createdAt/confirmedAt are stamped from the server clock; a caller can never supply a timestamp.
• Mount-safe — correct under multiple named app.use mounts (e.g. marketing vs. transactional lists), each an isolated sandbox.

Installation

Copy codepnpm add @vllnt/convex-suppression

Peer dependency: convex@^1.41.0.

Usage

Copy code// convex/convex.config.ts
import { defineApp } from "convex/server";
import suppression from "@vllnt/convex-suppression/convex.config";

const app = defineApp();
app.use(suppression);
export default app;

Copy code// convex/email.ts — host owns auth + hashing; pass an opaque contactHash in.
import { components } from "./_generated/api";
import { mutation, query } from "./_generated/server";
import { v } from "convex/values";
import { Suppression } from "@vllnt/convex-suppression";

const dnc = new Suppression<{ ip: string }>(components.suppression, {
  proofValidator: v.object({ ip: v.string() }).parse,
});
const hash = (email: string) => myHash(email.trim().toLowerCase()); // host's hashing + salt policy

// The send gate — call before every send.
export const canEmail = query({
  args: { email: v.string() },
  handler: (ctx, { email }) =>
    dnc.isEligible(ctx, hash(email), { channel: "email", listKey: "newsletter", requireOptIn: true }),
});

// A provider webhook suppresses on complaint; a confirmed double opt-in records proof.
export const onComplaint = mutation({
  args: { email: v.string() },
  handler: (ctx, { email }) => dnc.suppress(ctx, hash(email), "complaint", { channel: "email" }),
});
export const confirmOptIn = mutation({
  args: { email: v.string(), ip: v.string() },
  handler: (ctx, { email, ip }) =>
    dnc.recordOptIn(ctx, hash(email), { listKey: "newsletter", source: "double-opt-in", proof: { ip } }),
});

Client options: new Suppression(component, { proofValidator? }). Omitting channel/listKey targets the global entry.

API Reference

Full reference: docs/API.md.

React

Backend-only — no ./react entry. The consumer surface is a server-side isEligible gate and webhook-driven suppress writes; a reactive do-not-contact badge, if ever needed, is an ordinary useQuery over the host's re-exported isSuppressed ref.

Security

• Auth-agnostic — the host authenticates the caller, decides who may suppress/query a hash, and passes an opaque contactHash; tables are sandboxed.
• Hash-keyed, never raw PII — the host hashes and normalizes the contact and owns the salt policy; a suppression survives erasure of the subject.
• Server-sourced time — createdAt/confirmedAt come from Date.now() in each handler, never the caller; the opt-in proof is opaque, narrowed by the host validator.

See docs/API.md.

Testing

Copy codepnpm test           # single run
pnpm test:coverage  # enforced 100% on covered files

Tests run against the real component runtime via convex-test (@edge-runtime/vm), not mocks.

Contributing

See CONTRIBUTING.md.

Author

Built by bntvllnt · bntvllnt.com · X @bntvllnt

Part of the @vllnt Convex component fleet — vllnt.com

If this is useful, sponsor the work.

License

MIT — see LICENSE.