@warp-lang/commerce-types #

Formal commerce types derived from the Warp Commerce Model, canonical schema v1.0.0.

Typed money you can’t mix by accident. State transitions validated against the model’s 26-transition table. Runtime checkers for the six commerce invariants. Platform mappings for Shopify, WooCommerce, and Stripe.

When AI coding agents see these types in your project, they generate commerce code that satisfies them — and your TypeScript compiler enforces the rest.

Install #

npm install @warp-lang/commerce-types

Quickstart — order() #

The fastest path from install to a real validation result. order() is a fluent builder that composes a history-complete, auditable order in a few lines, then hands it to the headline auditCommerce check.

import { order } from "@warp-lang/commerce-types";

// Build a valid order: buyer, seller, a priced item, paid + fulfilled.
const built = order()
  .from("buyer_1")
  .to("seller_1")
  .item({ sku: "TSHIRT-RED-M", price: { amount: 200, currency: "MAD" } })
  .paid()
  .fulfilled()
  .build();   // Result<AuditedOrder> = { ok: true, value } | { ok: false, error }

if (built.ok) {
  // The headline check: audit the history-complete order. An empty list is clean.
  const violations = built.value.audit();   // []
}

// A buggy order — two currencies in one order — is surfaced as a Result,
// not coerced into a broken object.
const mixed = order()
  .from("buyer_1").to("seller_1")
  .value({ amount: 200, currency: "MAD" })
  .value({ amount: 30, currency: "EUR" })
  .build();

if (mixed.ok === false) {
  mixed.error; // "Order mixes currencies (MAD, EUR)… (Invariant 1: Value Conservation)"
}

Runnable version: examples/order-quickstart.mjs.

order() makes a correct order easy to construct; it does not make an incorrect one impossible. Invalid compositions — a missing party, the same party on both sides, mixed currencies, a non-finite amount — return { ok: false, error } with an actionable message, never a thrown exception and never a silently coerced object. Internally it uses the same public constructors and the applyCommitmentPath / applyFulfillmentPath replay helpers, so every state it reaches has a real, valid, append-only history — exactly what a hand-built object would have.

order() is a TypeScript convenience. The Python package (warp-commerce-types) exposes the same primitives, transitions, and invariant checkers, but does not (yet) ship this builder.

From scratch (the primitives) #

The builder is sugar — the primitives stay public and unchanged. When you need full control, construct and transition objects directly:

import {
  type Money,
  newCommitment,
  partyId,
  transitionCommitment,
  auditCommerce,
} from "@warp-lang/commerce-types";

// Money always carries currency — there is no amount without a denomination.
const price: Money = { amount: 150, currency: "MAD" };

// State transitions are validated; invalid ones return an error, not a throw.
// transitionCommitment returns Result<Commitment> = { ok: true, value } | { ok: false, error }.
// Checking `r.ok` narrows the type, so `r.value` needs no non-null assertion.
const commitment = newCommitment(partyId("cust_1"), partyId("store"));

const proposed = transitionCommitment(commitment, { type: "Proposed" }, partyId("cust_1"));
if (proposed.ok === false) throw new Error(proposed.error);

const accepted = transitionCommitment(proposed.value, { type: "Accepted" }, partyId("store"));
if (accepted.ok === false) throw new Error(accepted.error);

// Accepted → Draft is rejected: an invalid transition returns an error, not a throw.
const bad = transitionCommitment(accepted.value, { type: "Draft" }, partyId("store"));
if (bad.ok === false) bad.error; // human-readable explanation (Invariant 2: State Monotonicity)

// Audit a set of commerce objects against all six invariants.
const violations = auditCommerce([accepted.value], [], []);

Currency-safe money #

import { add, convert, CurrencyMismatchError } from "@warp-lang/commerce-types";

add({ amount: 100, currency: "MAD" }, { amount: 50, currency: "MAD" }); // 150 MAD
add({ amount: 100, currency: "MAD" }, { amount: 50, currency: "EUR" }); // throws CurrencyMismatchError
const eur = convert({ amount: 1000, currency: "MAD" }, "EUR", 0.092);   // explicit rate required

Platform mappings #

import { fromShopifyOrder } from "@warp-lang/commerce-types/platforms/shopify";
import { fromStripePaymentIntent } from "@warp-lang/commerce-types/platforms/stripe";

const commitment = fromShopifyOrder(shopifyOrder); // Order → Commitment, status mapped

Core API #

The surface is large, but you only need a handful of exports to start. These are the “start here” set — the 5-minute path uses them:

Advanced API #

Everything else is exported and fully supported, just lower-level — reach for it when the core surface is not enough:

Deprecations #

These older names are duplicate aliases of a canonical function. They still work — nothing breaks — but they are marked @deprecated (your editor will strike them through) and will be removed in a future major version. Migrate to the canonical name:

The six invariants #

1. Value Conservation — money always carries currency; no silent mixing.
2. State Monotonicity — orders follow directed state paths; no backward transitions.
3. Capacity Verification — party capacity verified before a commitment is Accepted.
4. Temporal Integrity — fulfillment follows commitment; history is append-only.
5. Identity Permanence — IDs are unique and never reused.
6. Commitment Tree Consistency — child order values sum to their parent.

Generated from the canonical schema #

The structural types and the state-transition tables are generated from the canonical schema spine (schema/structure/*.schema.json + schema/behavior/transitions.json), not hand-authored. The generator lives at scripts/generate-from-schema.mjs and emits src/generated/; the brand types (PartyID, …) and the open CurrencyCode union — which JSON Schema cannot express — are re-applied by the generator. The runtime (money math, transition functions, invariant checkers, platform adapters) is hand-written and consumes the generated types.

npm run generate   # regenerate src/generated/ from ../../schema
npm run codegen    # CI: fail if the generated output drifts from the schema

Scope #

The package covers the five primitives, the three state machines with their transition validators, the six invariant checkers, currency-safe money, the order() builder (TypeScript), and the Shopify / WooCommerce / Stripe mappings. The fuller value trees (digital licensing / streaming / service-scheduling detail) and the market-making records (AuctionProcess, ResolutionProcess) are modeled in the specification and land in a later release.

License #

MIT