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TypeScript Best Practices

Leverage TypeScript's type system for safety and clarity.

No any Type​

Always use specific types or unknown when type is truly unknown.

Explicit Return Types​

Annotate function return types for clarity.

Interfaces Over Types​

Use interfaces for object shapes:

interface FundEntity {
  id: number;
  name: string;
  code: string;
}

Type Guards​

Use type guards for safe type narrowing:

function isFund(entity: unknown): entity is FundEntity {
  return typeof entity === "object" && entity !== null && "code" in entity;
}

See Coding Standards for more details.