openzeppelin-contracts/contracts/governance/extensions/IGovernorTimelock.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (governance/extensions/IGovernorTimelock.sol)

pragma solidity ^0.8.19;

import {IGovernor} from "../IGovernor.sol";

/**
 * @dev Extension of the {IGovernor} for timelock supporting modules.
 */
abstract contract IGovernorTimelock is IGovernor {
    /**
     * @dev The proposal hasn't been queued yet.
     */
    error GovernorNotQueuedProposal(uint256 proposalId);

    /**
     * @dev The proposal has already been queued.
     */
    error GovernorAlreadyQueuedProposal(uint256 proposalId);

    event ProposalQueued(uint256 proposalId, uint256 eta);

    function timelock() public view virtual returns (address);

    function proposalEta(uint256 proposalId) public view virtual returns (uint256);

    function queue(
        address[] memory targets,
        uint256[] memory values,
        bytes[] memory calldatas,
        bytes32 descriptionHash
    ) public virtual returns (uint256 proposalId);
}