VM Affordances

The AssemblyScript Stylus SDK provides high-level affordances for interacting with the Arbitrum Virtual Machine. They can be imported from @wakeuplabs/as-stylus.

import { Contract, block, U256, View, Address, msg, contract } from "@wakeuplabs/as-stylus";

@Contract
export class BlockGetters {
  @View
  getBasefee(): U256 {
    return block.basefee;
  }

  @View
  getNumber(): U256 {
    return block.number;
  }

  @View
  getTimestamp(): U256 {
    return block.timestamp;
  }

  @View
  getChainId(): U256 {
    return block.chainId;
  }

  @View
  getCoinbase(): Address {
    return block.coinbase;
  }

  @View
  getGaslimit(): U256 {
    return block.gaslimit;
  }
}

block

Access information about the current block:

• block.basefee – current block base fee (U256)
• block.chainId – Arbitrum chain identifier (U256)
• block.coinbase – L1 batch poster (coinbase) address (Address)
• block.gaslimit – block gas limit (U256)
• block.number – sequencer’s estimate of the L1 block number (U256)
• block.timestamp – sequencer’s estimate of the block timestamp (U256)
• block.hasBasefee – boolean helper indicating whether block.basefee is non-zero

msg

Interact with the current call context:

• msg.sender – address that invoked the program
• msg.value – ETH value (in wei) sent with the call

import { msg, Address } from "@wakeuplabs/as-stylus";

export function isOwner(owner: Address): boolean {
  return msg.sender.equals(owner);
}

contract

Access information about the current contract:

• contract.address – address of the contract (Address)

import { contract, Address } from "@wakeuplabs/as-stylus";

@Contract
export class MyContract {
  @View
  getContractAddress(): Address {
    return contract.address;
  }
}