@effectstream/config

Type-safe configuration builders for EffectStream nodes - networks, deployed contract addresses, sync protocols, primitives, and security namespaces. A fluent API with strict TypeScript inference: each builder step refines the type of what comes next, so misuse fails at compile time.

• Fluent, type-safe configuration builders for Effectstream nodes.
• Strict inference: each step refines the type of what comes next, so misuse is a compile error.
• Used by every template's packages/node/config.dev.ts.
• Covers networks, deployed contract addresses, sync protocols, primitives, security namespaces.

Install

bun add @effectstream/config
# or
npm install @effectstream/config

Standalone usage

The builders are pure data assembly. You can construct a config object outside an EffectStream node and inspect it, snapshot it, or feed it to your own tooling.

import {
  ConfigBuilder,
  ConfigNetworkType,
  ConfigSyncProtocolType,
} from "@effectstream/config";
import { hardhat } from "viem/chains";

export const config = new ConfigBuilder()
  .setNamespace((b) => b.setSecurityNamespace("my-app"))
  .buildNetworks((b) =>
    b.addNetwork({
      name: "local-evm",
      type: ConfigNetworkType.EVM,
      ...hardhat,
    })
  );
  // continue with .buildDeployments(), .buildSyncProtocols(),
  // .buildPrimitives(), and finally .build()

The runtime side (PaimaStaticConfigContext, withEffectstreamStaticConfig, usePaimaStaticConfig) plugs that same config into an Effection context so node packages can read it. You don't need those entry points unless you're running a full node.

Inside EffectStream

config is what every node component reads to find out which chains to sync from, where contracts live, and what primitives to emit. The templates under templates/* all define their config with ConfigBuilder in packages/node/config.dev.ts.

Key exports

What app code typically imports:

• ConfigBuilder - fluent top-level builder. Chain .setNamespace(), .buildNetworks(), .buildDeployments(), .buildSyncProtocols(), .buildPrimitives(), then .build(). Used by every template.
• ConfigNetworkType, ConfigSyncProtocolType - enums for the network and sync-protocol kinds (EVM, Cardano, Midnight, Bitcoin, Avail, NEAR, Algorand, Mina, Polkadot, NTP variants). The most-imported symbols from this package by far.
• withEffectstreamStaticConfig(config) - Effection generator that publishes the built config to the runtime context.
• toSyncProtocolWithNetwork(...) - joins a sync protocol with its source network config; used by app code when wiring custom primitives.
• getViemNetwork(network) - generator that returns a viem Chain. Takes the EVM network config object (a ConfigNetworkEvm), not a network name.
• getPrimitivesForSyncProtocol(...) - the primitives registered against a given sync protocol.
• onlyOnce, onlyValue, onlyNotError - small helpers for narrowing config lookups that may return zero, many, or error results.

Per-section builders (NetworkBuilder, DeployedAddressBuilder, SyncProtocolBuilder, PrimitiveBuilder, SecurityNamespaceBuilder) are exported, but you usually access them via the callback argument inside ConfigBuilder.setNamespace((b) => b.setSecurityNamespace(...)) rather than importing them directly.

Runtime-side context types (PaimaStaticConfigContext, usePaimaStaticConfig) are reserved for the runtime's own internals and aren't typically imported by app code.

The schema layer

Underneath the builders sits a large TypeBox schema surface — roughly 130 exports — that defines and validates the shape of a configuration. App code rarely imports from it directly, because ConfigBuilder produces already-validated config, but it is the authority on what fields each network and sync protocol accepts:

• ConfigSchema - the wrapper class the per-section schemas are built from, with required / optional halves and helpers like allProperties() and cloneMerge().
• ConfigNetworkSchema* - one per network kind, e.g. ConfigNetworkSchemaMidnight (whose networkId is a string such as "undeployed"), ConfigNetworkSchemaEvm, ConfigNetworkSchemaCardano. Each pairs with a ConfigNetwork* static type.
• ConfigSyncProtocolSchema* - one per protocol, carrying that protocol's polling, block-range and endpoint fields.
• CommonResponse* - the payload shapes primitives deliver to the state machine.
• LedgerSchema / LedgerPrimitiveType - the ledger-field types usable in primitive definitions.

If you are writing a custom primitive or network integration and need to know exactly which fields are accepted, read the schema for that kind in src/schema/ — it is the source of truth the builders validate against.

Examples

Runnable: test/examples.test.ts.

Real-world usage in templates:

• templates/preorder/packages/node/config.dev.ts
• templates/evm-cardano/packages/node/config.dev.ts

Links

• Docs: https://effectstream.github.io/docs/packages/sdk/config
• Source: https://github.com/effectstream/effectstream/tree/main/packages/effectstream-sdk/config