(WIP) ethabi.wasm

WebAssembly powered Ethereum ABI encoder/decoder for Deno, written in Rust.

Uses https://github.com/rust-ethereum/ethabi under the hood.

Features

• Only does the ABI encoding/decoding, you can use your own RPC lib
• Compatible with (almost) any WASM-compliant JS runtime (Deno, Node, browser)
• Gracefully exits when given wrong values

Usage

deno cache -r https://deno.land/x/ethabi/mod.ts

import { Contract, call, deploy } from "https://deno.land/x/ethabi/mod.ts";

const ERC20url = new URL("ERC20.json", import.meta.url);
const ERC20 = JSON.parse(Deno.readTextFileSync(ERC20url));

const contract = new Contract(ERC20);

// Call function "transfer" with address and uint256
const transfer = contract.function("transfer")!;
const myaddress = "0x39dfd20386F5d17eBa42763606B8c704FcDd1c1D";
const encoded = call(transfer, myaddress, 10000000000n);
// -> hex-encoded 0x-prefixed string

// Deploy contract with bytecode and uint256
const code = new UInt8Array(/* your bytecode */);
const constructr = contract.constructr()!;
const encoded = deploy(constructr, code, 10000n);
// -> hex-encoded 0x-prefixed string

Test

deno cache -r https://deno.land/x/ethabi/test/token.ts
deno run --allow-net https://deno.land/x/ethabi/test/token.ts

Current features

• Function input encoding/decoding
• Function output decoding
• Constructor encoding/decoding
• Tokenization of simple types:
  • JS string <-> Solidity string
  • JS string <-> Solitidy address
  • JS bigint <-> Solidity (u)int
  • JS number <-> Solidity (u)int

Building (using Deno)

• Install wasm-pack

  cargo install wasm-pack

• Generate WASM

  wasm-pack build --target web --release

• Pack .wasm to .wasm.js

  deno run -A build.ts