Installation

Install

viem is a required peer dependency — install it alongside the package:

bun

bun add @maxencerb/evs viem

npm

npm install @maxencerb/evs viem

pnpm

pnpm add @maxencerb/evs viem

Requirements

Requirement	Version	Notes
viem	>=2.14.1	Required peer dependency. Execution and result typing go through viem’s readContract inference.
typescript	>=5.5	Optional peer dependency — the runtime works without it, but the typed surface (literal-typed ABI, Expr inference) is the point of the library. strict mode is required.
Node.js	>=20.19	Or Bun.

TypeScript strict mode is required

Set "strict": true in your tsconfig.json. The typed builder surface — argument tuples, Expr branding, viem result inference — is only sound under strict mode, and the binding API contract assumes it.

ESM only

The package ships as ESM only ("type": "module"): there is no CommonJS build, so use import, not require. Everything is exported from the single entry point @maxencerb/evs — the exports map exposes no module subpaths, so deep imports like @maxencerb/evs/core do not resolve.

Verify the setup

This compiles a one-argument script to bytecode without touching a network — if it typechecks and runs, you are set:

import { arg, compile, evscript, t } from '@maxencerb/evs';

const ping = evscript({ name: 'ping', args: [arg('x', t.uint256)] }, (s) => {
  return s.return({ doubled: s.args.x.mul(2n) });
});

export const artifact = compile(ping);
// artifact.runtimeBytecode — EVM bytecode, ready for eth_call

Continue with the quick start to execute a script against a real node.