setup-typescript-app.sh

#!/bin/bash

# Function to print usage
print_usage() {
  echo "Usage: $0 [-d directory]"
}

# Parse the command line arguments
while getopts 'd:' flag; do
  case "${flag}" in
    d) directory="${OPTARG}" ;;
    *) print_usage
       exit 1 ;;
  esac
done

# If directory is not provided, prompt the user
if [ -z "$directory" ]; then
  read -p "Enter the directory name: " directory
fi

# Create project directory
mkdir -p "$directory"
cd "$directory"

# Initialize Node.js project
npm init -y

# Install TypeScript
npm install typescript --save-dev

# Initialize TypeScript configuration
npx tsc --init

sed -i '/"compilerOptions": {/a \
  "outDir": "dist", \
  "rootDir": "src",' tsconfig.json

# Install ESLint and Prettier, resolving peer dependency conflicts
npm install [email protected] @typescript-eslint/[email protected] @typescript-eslint/[email protected] prettier eslint-config-prettier eslint-plugin-prettier --save-dev

# Create ESLint configuration
cat > .eslintrc.json <<EOL
{
  "env": {
    "es2021": true,
    "node": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "prettier"
  ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 12,
    "sourceType": "module"
  },
  "plugins": [
    "@typescript-eslint",
    "prettier"
  ],
  "rules": {
    "prettier/prettier": "error",
    "indent": ["error", 2],
    "linebreak-style": ["error", "unix"],
    "quotes": ["error", "single"],
    "semi": ["error", "always"]
  }
}
EOL

# Create Prettier configuration
cat > .prettierrc <<EOL
{
  "singleQuote": true,
  "semi": true,
  "tabWidth": 2,
  "trailingComma": "es5",
  "printWidth": 80
}
EOL

# Create source directory and sample TypeScript file
mkdir src
cat > src/index.ts <<EOL
const greet = (name: string): string => {
  return \`Hello, \${name}!\`;
};

const user = 'World';
console.log(greet(user));
EOL

# Add npm scripts to package.json
jq '.scripts += {
  "build": "tsc",
  "start": "node dist/index.js",
  "lint": "eslint src/**/*.ts --fix",
  "format": "prettier --write src/**/*.ts",
  "dev": "tsc --watch"
}' package.json > temp.json && mv temp.json package.json

# Build the project
npx tsc

# Run the project
node dist/index.js