### Install ERC721Psi with npm

Source: https://github.com/estarriolvetch/erc721psi/blob/main/README.md

This snippet shows how to install the ERC721Psi library as a development dependency using npm, a popular JavaScript package manager.

```bash
npm install --save-dev erc721psi
```

--------------------------------

### Install ERC721Psi with yarn

Source: https://github.com/estarriolvetch/erc721psi/blob/main/README.md

This snippet demonstrates how to install the ERC721Psi library as a development dependency using yarn, an alternative JavaScript package manager.

```bash
yarn add --dev erc721psi
```

--------------------------------

### Basic ERC721Psi Contract with Batch Minting

Source: https://github.com/estarriolvetch/erc721psi/blob/main/README.md

This Solidity code defines a basic ERC721 compliant contract named 'Adventurer' using the ERC721Psi library. It includes a constructor to set the token name and symbol, and a 'mint' function that allows batch minting of tokens with a fixed gas cost, similar to ERC721A.

```solidity
pragma solidity ^0.8.0;

import "erc721psi/contracts/ERC721Psi.sol";

contract Adventurer is ERC721Psi {

    constructor() 
        ERC721Psi ("Adventurer", "ADVENTURER"){
    }

    function mint(uint256 quantity) external payable {
        // _safeMint's second argument now takes in a quantity, not a tokenId. (same as ERC721A)
        _safeMint(msg.sender, quantity);
    }

}
```

--------------------------------

### ERC721Psi Random Seed Interface

Source: https://github.com/estarriolvetch/erc721psi/blob/main/README.md

This Solidity interface defines the 'IERC721RandomSeed' for interacting with ERC721Psi's random seed extension. It includes a 'seed' function that returns a unique random seed for a given token ID, intended for generating randomized metadata.

```solidity
interface IERC721RandomSeed {
    function seed(uint256 tokenId) external view returns (uint256);
}
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.