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CODING_STANDARDS.md

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Coding guidelines for TypeScript

  • The following standards are inspired from Coding guidelines for TypeScript (which you should follow when something is not specified in this document, although any pre-existing practices in a file being edited trump either style guide).

Names

  • Use PascalCase for type names.
  • Use I as a prefix for interface names only when an interface is implemented by a class.
  • Use PascalCase for enum values.
  • Use camelCase for function names.
  • Use camelCase for property names and local variables.
  • Do not use _ as a prefix for private properties (unless used as backing properties).
  • Use whole words in names when possible.

Types

  • Do not export types/functions unless you need to share it across multiple components.
  • Do not introduce new types/values to the global namespace.
  • Shared types should be defined in types.ts. Within a file, type definitions should come first.

null and undefined

Use undefined. Do not use null.

Comments

  • Comments must end with a period.
  • Use JSDoc style comments for functions, interfaces, enums, and classes.

Strings

Use single quotes for strings.

Imports

  • Use ES6 module imports.
  • Do not use bare import *; all imports should either explicitly pull in an object or import an entire module, otherwise you're implicitly polluting the global namespace and making it difficult to figure out from code examination where a name originates from.

Style

  • Use prettier to format TypeScript and JavaScript code.

  • Use arrow functions over anonymous function expressions.

  • Always surround loop and conditional bodies with curly braces. Statements on the same line are allowed to omit braces.

  • Open curly braces always go on the same line as whatever necessitates them.

  • Parenthesized constructs should have no surrounding whitespace.

  • A single space follows commas, colons, and semicolons in those constructs. For example:

    • for (var i = 0, n = str.length; i < 10; i++) { }
    • if (x < 10) { }
    • function f(x: number, y: string): void { }

  • else goes on the same line from the closing curly brace.

  • Use 4 spaces per indentation.

  • All files must end with an empty line.