Error HH11: An internal invariant was violated: WASM build of solc 0.6.6 isn't working

[hrushigawade4]

Lesson 7

after importing the contract import "@chainlink/contracts/src/v0.6/tests/MockV3Aggregator.sol"; in MockV3Aggregator.sol
i got a error

Error HH11: An internal invariant was violated: WASM build of solc 0.6.6 isn't working

For more info go to https://hardhat.org/HH11 or run Hardhat with --show-stack-traces
error Command failed with exit code 1.

Here is my file after update the solidity compilers in hardhat.config.js

module.exports = {
    // solidity: "0.8.8",
    solidity: {
        compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
    },

----------------------------------------------------------------------------------------------------------------------------------------------
MockV3Aggregator.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "@chainlink/contracts/src/v0.6/tests/MockV3Aggregator.sol";

Error

Error HH11: An internal invariant was violated: WASM build of solc 0.6.6 isn't working

For more info go to https://hardhat.org/HH11 or run Hardhat with --show-stack-traces
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[RoboCrypter]

@hrushigawade4 : Add solidity compiler version 0.6.0 in your hardhat.config.js file:

compilers: [{ version: "0.8.8" }, { version: "0.6.0" }, { version: "0.6.6" }] copy & paste this compilers line in your solidity compilers.

Hopefully, It will resolve your issue!

[RoboCrypter]

@hrushigawade4 : Can you send me the chainlink/contract version you are using from your package.json file

[RoboCrypter]

@hrushigawade4 : Install this one by this command:
yarn add @chainlink/contracts@^0.3.1
or
npm install @chainlink/contracts@^0.3.1

[RoboCrypter]

@hrushigawade4 : check with 0.6.0 compiler

[hrushigawade4]

[RoboCrypter]

@hrushigawade4 : Send me the MockV3Aggregator.sol from your node_modules and paste it here!

[RoboCrypter]

@hrushigawade4 Yes!

/src/v0.6/tests/MockV3Aggregator.sol

[RoboCrypter]

@hrushigawade4 : Now replace your MockV3Aggregator.sol file with this one, just Select all and paste this one inside the same file!

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "@chainlink/contracts/src/v0.6/interfaces/AggregatorInterface.sol";
import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol";

/**
 * @title MockV3Aggregator
 * @notice Based on the FluxAggregator contract
 * @notice Use this contract when you need to test
 * other contract's ability to read data from an
 * aggregator contract, but how the aggregator got
 * its answer is unimportant
 */
contract MockV3Aggregator is AggregatorInterface, AggregatorV3Interface {
  uint256 constant public override version = 0;

  uint8 public override decimals;
  int256 public override latestAnswer;
  uint256 public override latestTimestamp;
  uint256 public override latestRound;

  mapping(uint256 => int256) public override getAnswer;
  mapping(uint256 => uint256) public override getTimestamp;
  mapping(uint256 => uint256) private getStartedAt;

  constructor(
    uint8 _decimals,
    int256 _initialAnswer
  ) public {
    decimals = _decimals;
    updateAnswer(_initialAnswer);
  }

  function updateAnswer(
    int256 _answer
  ) public {
    latestAnswer = _answer;
    latestTimestamp = block.timestamp;
    latestRound++;
    getAnswer[latestRound] = _answer;
    getTimestamp[latestRound] = block.timestamp;
    getStartedAt[latestRound] = block.timestamp;
  }

  function updateRoundData(
    uint80 _roundId,
    int256 _answer,
    uint256 _timestamp,
    uint256 _startedAt
  ) public {
    latestRound = _roundId;
    latestAnswer = _answer;
    latestTimestamp = _timestamp;
    getAnswer[latestRound] = _answer;
    getTimestamp[latestRound] = _timestamp;
    getStartedAt[latestRound] = _startedAt;
  }

  function getRoundData(uint80 _roundId)
    external
    view
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return (
      _roundId,
      getAnswer[_roundId],
      getStartedAt[_roundId],
      getTimestamp[_roundId],
      _roundId
    );
  }

  function latestRoundData()
    external
    view
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return (
      uint80(latestRound),
      getAnswer[latestRound],
      getStartedAt[latestRound],
      getTimestamp[latestRound],
      uint80(latestRound)
    );
  }

  function description()
    external
    view
    override
    returns (string memory)
  {
    return "v0.6/tests/MockV3Aggregator.sol";
  }
}

[RoboCrypter]

@hrushigawade4 : But If you copy paste the above file I mentioned it will also fix your issue!

[RoboCrypter]

@hrushigawade4 : I thought compiler versions are creating problems so, I went for a different approach!

[RoboCrypter]

@hrushigawade4 : After pasting the file run compile and let me know!

[RoboCrypter]

@hrushigawade4 : Awesome! Kindly mark the answer as answered! ThankYou

Have a good one!

[RoboCrypter]

@hrushigawade4 : Awesome! and ThankYou! Pleasure is all mine.

Kindly mark it an answer to close this discussion as answered.

Have a good one!

[hrushigawade4]

[RoboCrypter]

@hrushigawade4 : Yes the issue was particularly with the compiler version 0.6.6