For quickly scaffolding out a new TDD TS project.

tsc-quick.sh

#!/bin/bash

# Check if a project name is provided
if [ -z "$1" ]; then
  echo "Please provide a project name."
  exit 1
fi

PROJECT_NAME=$1

# Step 1: Create the project
mkdir $PROJECT_NAME
cd $PROJECT_NAME

# Step 2: Init npm and tsc
npm init -y
tsc --init

# Step 3: Scaffold out the project
mkdir src dist
cd src && touch index.ts

# Populate index.ts with a simple Hello World program
echo 'async function main() {
  console.log("Hello World!");
}

main();' > index.ts
cd ..

# Step 4: Configure the tsconfig.json
echo '{
  "compilerOptions": {
    "target": "es2022",
    "module": "commonjs",
    "rootDir": "./src",
    "outDir": "./dist",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "skipLibCheck": true
  },
  "exclude": ["node_modules", "__tests__"]
}' > tsconfig.json

# Step 5: Set up jest for testing
npm i --save-dev babel-jest @babel/core @babel/preset-env nodemon jest
echo 'module.exports = {
  presets: [["@babel/preset-env", {targets: {node: "current"}}]],
};' > babel.config.js

npm i --save-dev @babel/preset-typescript
npm i --save-dev @types/jest

# Update babel.config.js
echo 'module.exports = {
  presets: [
    ["@babel/preset-env", {targets: {node: "current"}}],
    "@babel/preset-typescript",
  ],
};' > babel.config.js

mkdir __tests__
cd __tests__
mkdir sample
cd sample
touch sample.spec.ts

# Add a sample test
echo '// in __tests__/sample/sample.spec.ts

describe("Sample test", () => {
  it("should be true", () => {
    expect(true).toBe(true);
  });
});' > sample.spec.ts
cd ../..

# Step 6: Add scripts to package.json
sed -i '' '/"scripts": {/,/}/c\
  "scripts": {\
    "build": "tsc --outDir dist",\
    "watch": "tsc -w & nodemon --no-deprecation dist/index.js",\
    "test": "jest --watchAll --verbose --silent"\
  },' package.json