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Overview

Constructor.decodeParams decodes constructor arguments from the encoded params without a selector. If you have full deployment data, slice off the creation bytecode first.

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Quick Start

import { Abi } from '@tevm/voltaire/Abi';

const ctor = {
  type: 'constructor',
  stateMutability: 'nonpayable',
  inputs: [
    { type: 'string', name: 'name' },
    { type: 'string', name: 'symbol' },
    { type: 'uint8', name: 'decimals' }
  ]
} as const;

const params = Abi.Constructor.encodeParams(ctor, [
  'MyToken',
  'MTK',
  18
]);

const decoded = Abi.Constructor.decodeParams(ctor, params);
// ['MyToken', 'MTK', 18]

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Decoding from Deploy Data

If you have bytecode + params, slice off the bytecode length first: 
import { Hex } from '@tevm/voltaire/Hex';

const bytecodeHex = '0x6001600080600a6000396000f3...';
const deployData = Hex.concat(bytecodeHex, Hex.fromBytes(params));

const paramsHex = Hex.slice(deployData, Hex.size(bytecodeHex));
const paramsBytes = Hex.toBytes(paramsHex);

const decoded = Abi.Constructor.decodeParams(ctor, paramsBytes);

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Error Handling

decodeParams throws AbiDecodingError when the data does not match the constructor input types.

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See Also