I have solidity project with files like
pragma solidity ^0.5.0; import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
When I try to compile, I get error on not installed library
npx hardhat compile Error HH411: The library openzeppelin-solidity, imported from contracts/....sol, is not installed. Try installing it using npm.
I have tried installing
npm install @openzeppelin/contracts
and v3.1.0 that is proper match for solidity v0.5.0
npm install @firstname.lastname@example.org
But get the same error.
So what is this
openzeppelin-solidity library, and how to install it?