Sample

• Use TypeScript
• Use the latest stable JavaScript syntax with a transpiler, such as babel.
• Use ESLint and Prettier for auto-formatting and auto-fixing
• Use Jest for unit testing
• Prefer ES6 classes over prototypes.
• Use strict equality checks (=== and !==) except when comparing against (null or undefined).
• Prefer arrow functions =>, over the function keyword except when defining classes or methods.
• Prefer ES6 destructuring over object literal notation.
• Use ES6 spread and rest operator wherever possible for a cleaner code.
• Use PascalCase for classes, lowerCamelCase for variables and functions, SCREAMING_SNAKE_CASE for constants, _singleLeadingUnderscore for private variables and functions.
• Prefer template strings over string concatenation.
• Prefer promises over callbacks.
• Prefer array functions like map and forEach over for loops.
• Use const for declaring variables that will never be re-assigned, and let otherwise.
• Avoid var to declare variables.

• Use Prettier defaults with the following additional configuration (.prettierrc):

   {
     "singleQuote": true
   }

  This configuration includes:

  • Use semicolons at the end of each statement (sample)
  • Prefer single quotes (sample)
  • Use a trailing comma after each item in a multi-line array or object literal, including the last item. (sample)

If ESLint is used along with Prettier, the ESLInt plugin eslint-config-prettier should also be used to turn off all ESLint style rules that are already handled by Prettier.