Receiving parse error while importing AggregatorV3Interface from chainlink repo

[vibhaBlockchain]

Receiving parse error while importing chainlink interface AggregatorV3Interface.sol

Terminal output

Brownie v1.17.2 - Python development framework for Ethereum

Compiling contracts...
  Solc version: 0.8.8
  Optimizer: Enabled  Runs: 200
  EVM Version: Istanbul
CompilerError: solc returned the following errors:

ParserError: Source "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol" not found: File not found.
 --> contracts/Lottery.sol:5:1:
  |
5 | import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Lottery.sol

pragma solidity =0.8.8;
//Compiler using remote version: 'v0.8.8+commit.dddeac2f', solidity version: 0.8.8+commit.dddeac2f.Emscripten.clang

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

brownie-config.yaml file

dependencies:
  - smartcontractkit/[email protected]

complier:
  solc:
    remappings:
      - '@chainlink=smartcontractkit/[email protected]'

settings.json file for .vscode

{
    "solidity.compileUsingRemoteVersion": "v0.8.8+commit.dddeac2f",
    "solidity.enableLocalNodeCompiler": false,
    "solidity.defaultCompiler": "remote",
    "solidity.remappings": [
        "@chainlink/=/Users/xyz/.brownie/packages/smartcontractkit/[email protected]"
    ]
}

Solidity compiler information

Retrieving compiler information:
Compiler using remote version: 'v0.8.8+commit.dddeac2f', solidity version: 0.8.8+commit.dddeac2f.Emscripten.clang

[cromewar]

Hello @vibhaBlockchain Could your try deleting the .brownie folder and compiling again?

[vibhaBlockchain]

Deleted the .brownie folder and compiled again getting the same error message

$ brownie compile
Brownie v1.17.2 - Python development framework for Ethereum

Compiling contracts...
  Solc version: 0.8.8
  Optimizer: Enabled  Runs: 200
  EVM Version: Istanbul
CompilerError: solc returned the following errors:

ParserError: Source "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol" not found: File not found.
 --> contracts/Lottery.sol:6:1:
  |
6 | import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[cromewar]

That's weird as the file does exists on: https://github.com/smartcontractkit/chainlink-brownie-contracts/tree/main/contracts/src/v0.8/interfaces

Have any clue on this @PatrickAlphaC ?

[vibhaBlockchain]

Alright so it's working now when creating a project again from scratch with limited functionalities first.

1. I deleted the .brownie folder again per your recommendation. 2. Created a new projected added the FundMe.sol file and the brownie-config.yaml files from this project.

FundMe.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.8;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract FundMe {
    mapping(address => uint256) public addressToAmountFunded;
    address[] public funders;
    address public owner;
    AggregatorV3Interface public priceFeed;

    constructor(address _priceFeed) {
        priceFeed = AggregatorV3Interface(_priceFeed);
        owner = msg.sender;
    }

    function fund() public payable {
        uint256 minimumUSD = 50 * 10**18;
        require(
            getConversionRate(msg.value) >= minimumUSD,
            "You need to spend more ETH!"
        );
        addressToAmountFunded[msg.sender] += msg.value;
        funders.push(msg.sender);
    }

    function getVersion() public view returns (uint256) {
        return priceFeed.version();
    }

    function getPrice() public view returns (uint256) {
        (, int256 answer, , , ) = priceFeed.latestRoundData();
        return uint256(answer * 10000000000);
    }

    // 1000000000
    function getConversionRate(uint256 ethAmount)
        public
        view
        returns (uint256)
    {
        uint256 ethPrice = getPrice();
        uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000;
        return ethAmountInUsd;
    }

    function getEntranceFee() public view returns (uint256) {
        // minimumUSD
        uint256 minimumUSD = 50 * 10**18;
        uint256 price = getPrice();
        uint256 precision = 1 * 10**18;
        return (minimumUSD * precision) / price;
    }

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    function withdraw() public payable onlyOwner {
        payable(msg.sender).transfer(address(this).balance);

        for (
            uint256 funderIndex = 0;
            funderIndex < funders.length;
            funderIndex++
        ) {
            address funder = funders[funderIndex];
            addressToAmountFunded[funder] = 0;
        }
        funders = new address[](0);
    }
}

brownie-config.yaml

dependencies:
  # - <org>/<repo>@<version>
  - smartcontractkit/[email protected]
compiler:
  solc:
    remappings:
      # - '@name=<org>/<repo>@<version>''
      - '@chainlink=smartcontractkit/[email protected]'
dotenv: .env
networks:
  mainnet-fork-dev: 
    verify: False
  default: development
wallets:
  from-key: '0xabcabcabc'

Checking the solidity compiler information

Initialising compiler with settings:
Remote compiler: v0.8.8+commit.dddeac2f
Local compiler: 0.8.0
Node compiler module: solc
Default compiler: localNodeModule
This may take a couple of seconds as we may need to download the solc binaries...

Since this compiled successfully. Matched the git repo version and solidity compiler version with a new project for this with limited Lottery.sol functionalities. This compiled successfully. Post that added a new Lottery2.sol with expanded functionalities per the original tutorial, it compiles now. Not able to pinpoint what was the issue though.

Question: Before deleting the .brownie folder I checked the folder, I did have multiple version of the chainlink brownie project. Is the issue possibly related to that?
Part 2: Even if I hold multiple versions of this repo locally, shouldn't brownie fetch the correct one directly?

[cromewar]

I've seen some people have problems and is definitely related to brownie not working as it should rather than errors on the code itself.
Yes you have different versions because brownie does download everything it needs taking the brownie config.yaml
I'm glad you solved this now.

[vibhaBlockchain]

@cromewar I see, yeah the issue doesn't seem to be definitely reproducible. Thanks for your help on this!