activeFork

Signature

function activeFork() external returns (uint256);

Description

Returns the identifier for the currently active fork. Reverts if no fork is currently active.

Examples

Get the currently active fork id:

uint256 mainnetForkId = vm.createFork(MAINNET_RPC_URL); uint256 optimismForkId = vm.createFork(OPTIMISM_RPC_URL); assert(mainnetForkId != optimismForkId); vm.selectFork(mainnetForkId); assertEq(vm.activeFork(), mainnetForkId); vm.selectFork(optimismForkId); assertEq(vm.activeFork(), optimismForkId);

SEE ALSO