hardhat.config.js

require("@nomiclabs/hardhat-waffle");
require("hardhat-tracer");

task("flat", "Flattens and prints contracts and their dependencies (Resolves licenses)")
  .addOptionalVariadicPositionalParam("files", "The files to flatten", undefined, types.inputFile)
  .setAction(async ({ files }, hre) => {
    let flattened = await hre.run("flatten:get-flattened-sources", { files });
    
    // Remove every line started with "// SPDX-License-Identifier:"
    flattened = flattened.replace(/SPDX-License-Identifier:/gm, "License-Identifier:");
    flattened = `// SPDX-License-Identifier: MIXED\n\n${flattened}`;

    // Remove every line started with "pragma experimental ABIEncoderV2;" except the first one
    flattened = flattened.replace(/pragma experimental ABIEncoderV2;\n/gm, ((i) => (m) => (!i++ ? m : ""))(0));
    console.log(flattened);
  });
  

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: "0.8.4",
};