Refactor to pattern - TypeScript version

A sample project to demonstrate the refactoring of a set of codebase to pattern.

Cases

• Simplification
  • Compose Method
  • Use composite to replace Implicit Tree
• Generalization
  • Use Interpreter to replace Implicit Language - ProductFinder

steps to create project

• Init project config (package.json)

npm init -y
# using -y flag tells npm init to automatically use the defaults.

• Install TypeScript and ts-node

npm i -D typescript ts-node
# This will add the package under devDependencies

• Create a tsconfig.json file

# Will create the tsconfig.json file with default options
npx tsc --init

• Configuring Testing Environment

npm i -D jest ts-jest @types/jest

• Configure Jest: jest.config.js

   module.exports = {
     preset: "ts-jest",
     testEnvironment: "node",
   };

• Add TypeScript Configuration: Add include and exclude properties after compilerOptions

  {
  "compilerOptions": {
  // ...
  },
  "include": ["**/*.ts"],
  "exclude": ["node_modules"]
  }