Function.encodeResult

Encode function return values into ABI format

Usage Examples

Single Return Value

import { Function } from 'tevm'

const totalSupplyFn = new Function({
  type: "function",
  name: "totalSupply",
  inputs: [],
  outputs: [{ type: "uint256", name: "supply" }]
})

const encoded = totalSupplyFn.encodeResult([1000000n])

Multiple Return Values

import { Function } from 'tevm'

const getReservesFn = new Function({
  type: "function",
  name: "getReserves",
  outputs: [
    { type: "uint112", name: "reserve0" },
    { type: "uint112", name: "reserve1" },
    { type: "uint32", name: "blockTimestampLast" }
  ]
})

const encoded = getReservesFn.encodeResult([1000n, 2000n, 1234567n])

Boolean Return

import { Function } from 'tevm'

const transferFn = new Function({
  type: "function",
  name: "transfer",
  inputs: [
    { type: "address", name: "to" },
    { type: "uint256", name: "amount" }
  ],
  outputs: [{ type: "bool", name: "success" }]
})

const encoded = transferFn.encodeResult([true])

Dynamic Return Types

import { Function } from 'tevm'

const getNameFn = new Function({
  type: "function",
  name: "name",
  outputs: [{ type: "string", name: "name" }]
})

const encoded = getNameFn.encodeResult(["MyToken"])

Testing Contract Behavior

import { Function } from 'tevm'

const balanceOfFn = new Function({
  type: "function",
  name: "balanceOf",
  inputs: [{ type: "address", name: "owner" }],
  outputs: [{ type: "uint256", name: "balance" }]
})

// Create mock return data
const mockBalance = 1000n
const mockReturnData = balanceOfFn.encodeResult([mockBalance])

// Use in tests
async function testBalanceOf() {
  // Mock provider returns our encoded data
  mockProvider.setReturnData(mockReturnData)

  const balance = await contract.balanceOf(address)
  expect(balance).toBe(mockBalance)
}

See Also

• decodeResult - Decode function return values
• encodeParams - Encode function calldata