@suaveplan/currency-providers - Universal slim core for currency providers: CurrencyProviderRegistry, defineCurrencyProvider factory, shared httpRequest/composeAbortSignal helper, typed CurrencyProviderError + 8-code registry, and the ApiKeyConfig / NoKeyConfig / HttpFetchOptions / ProviderConfigBase shared types. Concrete providers (ECB, Fixer, Open Exchange Rates, Binance, CoinGecko, CoinMarketCap, CryptoCompare, Kraken, Virtual) ship as sibling @suaveplan/currency-provider- packages.

Slim plugin core for @suaveplan/currency rate providers. Ships the CurrencyProviderRegistry (name-keyed lookup), the defineCurrencyProvider factory, the shared httpRequest / composeAbortSignal helper, the typed CurrencyProviderError with the 8-code CURRENCY_PROVIDER_* registry, and the four shared config types (ApiKeyConfig, NoKeyConfig, HttpFetchOptions, ProviderConfigBase) that every sibling provider extends.

The concrete provider classes (ECB, Fixer, Open Exchange Rates, Binance, CoinGecko, CoinMarketCap, CryptoCompare, Kraken, Virtual) live in sibling @suaveplan/currency-provider-<name> packages — install only the ones you wire in.

Documentation tree

error-codes — Defines the stable CURRENCY_PROVIDER_CODES registry and the CurrencyProviderError class every provider in `@suavepl…
- error-codes — Defines the stable CURRENCY_PROVIDER_CODES registry and the CurrencyProviderError class every provider in `@suavepl…
factory — Exposes defineCurrencyProvider, the low-ceremony factory that sibling @suaveplan/currency-provider-<name> packages…
- factory — Exposes defineCurrencyProvider, the low-ceremony factory that sibling @suaveplan/currency-provider-<name> packages…
http — Exposes the two HTTP utilities every sibling @suaveplan/currency-provider-<name> package repeats: httpRequest (an a…
- http — Exposes the two HTTP utilities every sibling @suaveplan/currency-provider-<name> package repeats: httpRequest (an a…
registry — Defines CurrencyProviderRegistry, the in-memory registry that sibling @suaveplan/currency-provider-<name> packages…
- registry — Defines CurrencyProviderRegistry, the in-memory registry that sibling @suaveplan/currency-provider-<name> packages…
types — Defines the three configuration interfaces every concrete provider in @suaveplan/currency-providers consumes: `ApiKey…
- configs — Defines the three configuration interfaces every concrete provider in @suaveplan/currency-providers consumes: `ApiKey…

Install

bun add @suaveplan/currency-providers @suaveplan/currency
# plus whichever sibling provider packages you need:
bun add @suaveplan/currency-provider-ecb @suaveplan/currency-provider-coingecko

Quick start

import { CurrencyConverter } from "@suaveplan/currency";
import { CurrencyProviderRegistry } from "@suaveplan/currency-providers";
import { EcbProvider } from "@suaveplan/currency-provider-ecb";
import { CoinGeckoProvider } from "@suaveplan/currency-provider-coingecko";

const registry = new CurrencyProviderRegistry();
registry.register(new EcbProvider());
registry.register(new CoinGeckoProvider());

const converter = new CurrencyConverter({
    provider: registry.get("ecb"),
    fallbackProviders: [registry.get("coingecko")],
});

const rate = await converter.getRate("USD", "EUR");

Direct instantiation without the registry is equally supported — the registry is a convenience for callers that wire many providers and want a single lookup surface. Sibling packages remain CurrencyProvider-compatible so new CurrencyConverter({ provider: new EcbProvider() }) continues to work.

Features

CurrencyProviderRegistry — register / get / has / list / unregister. Typed PROVIDER_NOT_REGISTERED / PROVIDER_ALREADY_REGISTERED errors; list() returns a sorted snapshot for deterministic downstream tests
defineCurrencyProvider — factory for sibling packages that prefer the object-literal idiom over a hand-rolled class. Returns an Object.freeze-d CurrencyProvider
httpRequest — shared HTTP helper used by every sibling provider: abort-signal composition, timeout derivation, non-2xx → HTTP_ERROR mapping, returns the raw Response
composeAbortSignal — pure four-way composition of caller + timeout AbortSignals (undefined, single, single, AbortSignal.any)
Typed CurrencyProviderError extending SuaveplanError with 8 stable codes (HTTP_ERROR, PARSE_ERROR, UPSTREAM_ERROR, UNSUPPORTED_BASE, MISSING_CONFIG, UNKNOWN_CURRENCY, PROVIDER_NOT_REGISTERED, PROVIDER_ALREADY_REGISTERED)
Shared config types — ApiKeyConfig, NoKeyConfig, HttpFetchOptions, ProviderConfigBase with optional injectable FetchLike
Universal — zero browser/Node APIs, runs unchanged under Node ≥ 18, Bun, modern browsers, and Web Workers
Five subpath exports; explicit named barrels; 100/100/100/100 istanbul coverage

Modules

src/error-codes/error-codes.md — CURRENCY_PROVIDER_CODES registry + CurrencyProviderError class
src/types/configs.md — ApiKeyConfig, NoKeyConfig, HttpFetchOptions, ProviderConfigBase
src/registry/registry.md — CurrencyProviderRegistry
src/factory/factory.md — defineCurrencyProvider factory + DefineCurrencyProviderInput
src/http/http.md — httpRequest + composeAbortSignal shared HTTP helpers

Sibling provider packages

Provider	Sibling package
European Central Bank	`@suaveplan/currency-provider-ecb`
Fixer.io	`@suaveplan/currency-provider-fixer`
Open Exchange Rates	`@suaveplan/currency-provider-open-exchange-rates`
Binance	`@suaveplan/currency-provider-binance`
CoinGecko	`@suaveplan/currency-provider-coingecko`
CoinMarketCap	`@suaveplan/currency-provider-coinmarketcap`
CryptoCompare	`@suaveplan/currency-provider-cryptocompare`
Kraken	`@suaveplan/currency-provider-kraken`
Virtual (game / loyalty)	`@suaveplan/currency-provider-virtual`

Each sibling depends on this slim core for the registry, factory, HTTP helper, error class, and config types — and re-implements only its own provider-specific logic.

Status

0.1.0 (pre-graduation). Slim refactor of the 2026-05-17 migration: provider classes moved out to sibling packages; the registry / factory / HTTP helper landed here. See the design proposal for the refactor record and migration notes.