Data Feeds Hardhat Getting Started Guide

[khadni]

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Below is a summarization created by an LLM (gpt-4-turbo). Be mindful of hallucinations and verify accuracy.

Why

The changes introduce configuration files and a new contract for setting up a Hardhat project with Chainlink Data Feeds, aiming to streamline smart contract development and deployment processes, particularly for fetching data from external price feeds.

What

• data-feeds/getting-started/hardhat/.prettierrc: Added a Prettier configuration file to enforce consistent code formatting rules.
  • "tabWidth": 4 and "useTabs": false set tab behavior.
  • "semi": false and "singleQuote": false set punctuation preferences.
  • "printWidth": 100 with overrides for Solidity files to have a narrower printWidth of 80.
• data-feeds/getting-started/hardhat/.solhint.json: Added a Solhint configuration file to define linting rules for Solidity.
  • "extends": "solhint:recommended" applies recommended linting rules.
  • Custom rules like "compiler-version" and "func-visibility" are specified.
• data-feeds/getting-started/hardhat/.solhintignore: Added a file to specify directories to be ignored by Solhint, specifically node_modules.
• data-feeds/getting-started/hardhat/README.md: Added a detailed README to guide users through using the project, including setup and deployment instructions.
• data-feeds/getting-started/hardhat/contracts/DataConsumerV3.sol: Added a new Solidity contract which integrates with Chainlink to fetch the latest data from a BTC/USD price feed.
  • Uses AggregatorV3Interface for fetching data.
  • Includes a function getChainlinkDataFeedLatestAnswer to retrieve the latest price.
• data-feeds/getting-started/hardhat/hardhat.config.js: Configured Hardhat with necessary plugins and settings.
  • Includes custom network settings for the Ethereum Sepolia testnet.
  • Compiler settings optimized for production.
• data-feeds/getting-started/hardhat/package.json: Defines project dependencies and scripts for building and linting.
  • Dependencies include Hardhat tools and Chainlink contracts.
  • Scripts for compilation and linting are provided.
• data-feeds/getting-started/hardhat/tasks/deploy.js: Added a deploy script for the DataConsumerV3 contract.
  • Uses Hardhat's task system to simplify the deployment process.
• data-feeds/getting-started/hardhat/tasks/getChainlinkDataFeedLatestAnswer.js: Script to fetch the latest price feed answer using the deployed contract.
• data-feeds/getting-started/hardhat/tasks/index.js, utils/index.js, utils/spin.js: Utility scripts and task aggregator to enhance the development workflow.