Create project structure and monorepo workspace

1. Create the project folder and navigate into it:

mkdir walnut-app
cd walnut-app

1. Create the packages directory with subdirectories for contracts and cli

mkdir -p packages/contracts packages/cli

The contracts subdirectory will house the Seismic smart contract(s) and test(s) for the project, while the cli will house the interface to interact with the contracts.

1. Initialize a bun project in the root directory:

bun init -y && rm index.ts && rm tsconfig.json && touch .prettierrc && touch .gitmodules

We remove the default index.ts and tsconfig.json files created by bun init -y to keep the root directory clean and focused on managing the monorepo structure rather than containing code. We also create a .prettierrc file for consistent code formatting and a .gitmodules file to manage contract submodules.

1. Replace the default package.json with the following content for a monorepo setup:

{
  "workspaces": [
    "packages/**"
  ],
  "dependencies": {},
  "devDependencies": {
    "@trivago/prettier-plugin-sort-imports": "^5.2.1",
    "prettier": "^3.4.2"
  }
}

1. Add the following to the .prettierrc file for consistent code formatting:

{
  "semi": false,
  "tabWidth": 2,
  "singleQuote": true,
  "printWidth": 80,
  "trailingComma": "es5",
  "plugins": ["@trivago/prettier-plugin-sort-imports"],
  "importOrder": [
    "<TYPES>^(?!@)([^.].*$)</TYPES>",
    "<TYPES>^@(.*)$</TYPES>",
    "<TYPES>^[./]</TYPES>",
    "^(?!@)([^.].*$)",
    "^@(.*)$",
    "^[./]"
  ],
  "importOrderParserPlugins": ["typescript", "jsx", "decorators-legacy"],
  "importOrderSeparation": true,
  "importOrderSortSpecifiers": true
}

1. Replace the.gitignore file with:

# Compiler files
cache/
out/

# Ignores development broadcast logs
!/broadcast
/broadcast/*/31337/
/broadcast/**/dry-run/

# Docs
docs/

# Dotenv file
.env

node_modules/

1. Add the following to the .gitmodules file to track git submodules (in our case, only the Forge standard library, forge-std):

[submodule "packages/contracts/lib/forge-std"]
	path = packages/contracts/lib/forge-std
	url = https://github.com/foundry-rs/forge-std