This repository has implementations and tests for EIP-2535: Diamond Standard in TypeScript. It uses TypeChain and shows a neat way to call facets via casting:

//    contract variable                         facet name     diamond address     cast to contract type
const foobarFacet = (await ethers.getContractAt('FoobarFacet', diamondAddress)) as FoobarFacet;

Although you are connected to the Diamond contract, the calldata will be formed according to FoobardFacet which will cause them to fall into the fallback at the diamond, and be routed accordingly.

This repository is complementary to my blog post: https://dev.to/erhant/how-to-use-typescript-with-eip-2535-diamonds-3gl6

• yarn to install the required packages.
• yarn compile to compile the contracts.
• yarn test to test the contracts.
• yarn lint to lint everything.
• yarn clean to clean build artifacts.
• yarn node:start to start a Hardhat node on localhost.
• yarn node:run <path> to run a script at the given path on localhost.

• TypeScript codes are formatted & linted with GTS.
• Contracts are formatted with Solidity + Hardhat.