Lesson 4: Remix FundMe

[0x3agle]

In lesson 4, we are importing AggregatorV3Interface from GitHub using import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

My doubt is:
AggregatorV3Interface is in the smart contract which is deployed on blockchain and Github/NPM is on Internet, then how can a smart contract import another smart contract from the Internet?
Does it use an oracle?
if yes, can you please elaborate?

[SimSimButDifferent]

You do not use an oracle to import into a solidity smart contract. Usually you import from a node_modules folder that is in your project folder or alternatively you can import straight from github.

The way you are importing is importing straight from the 'npm' file in remix (This is the same as importing from a node_modules folder, which you will learn about as soon as your start using hardhat).

If for some reason this does not work, you can find the code on the github repo, in this case search for chainlink/contracts and navigate through. Then you would simply import the url as is:

import "https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

Hope that helps!

[0x3agle]

What I am asking is how a smart contract (on the blockchain) is importing another smart contract (on GitHub) if the blockchain is not directly connected to the internet.
Is it that when we compile our solidity contract in remix, the imported file is also attached to our contract during compilation?

[alymurtazamemon]

@0x3agle We are importing an interface not the contract and for it, we are installing @chainlink/contracts

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