getSha256.js

const crypto = require("crypto");
const fs = require("fs");
const path = require("path");

function humanFileSize(size) {
  const i = size === 0 ? 0 : Math.floor(Math.log(size) / Math.log(1024));
  return (
    (size / Math.pow(1024, i)).toFixed(2) * 1 +
    " " +
    ["B", "kB", "MB", "GB", "TB"][i]
  );
}

const [contract] = process.argv.slice(2);
const filePath = path.join(
  __dirname,
  "contracts",
  contract,
  `build/release/${contract}.wasm`
);
const data = fs.readFileSync(filePath);
const hash = crypto.createHash("sha256").update(data).digest("hex");

console.log(`
contract: ${contract}
file:     ${filePath}
size:     ${data.length} bytes (${humanFileSize(data.length)})
sha256:   ${hash}
`);