TypeScript Professional Standards & Ethics 4

Question 1

What is the professional standard for handling deprecated TypeScript APIs in a shared codebase?

Accepted Answer

Mark them with `@deprecated` JSDoc, communicate a migration path, and phase them out gradually

Answer

The professional approach uses `@deprecated` annotations and provides a clear migration path before removal to respect downstream consumers.

Question 2

A developer is tasked with migrating a JavaScript codebase to TypeScript. They convert all unresolvable types to `any` to pass CI quickly. This approach violates which standard?

Accepted Answer

The principle of honest representation of code quality and completeness

Answer

Masking type problems with `any` misrepresents migration progress and creates hidden technical debt that misleads stakeholders.

Question 3

Which TypeScript-specific practice upholds the professional principle of 'least privilege' in API design?

Accepted Answer

Using `private`, `protected`, and minimizing public surface area

Answer

Restricting visibility with `private` and `protected` limits the public API surface, reducing coupling and accidental misuse.

Question 4

A developer notices a teammate using AI-generated TypeScript code without reviewing it for correctness. What is the professional responsibility here?

Accepted Answer

Raise the concern: all code, regardless of source, must be reviewed and understood before merging

Answer

Every developer is accountable for code they commit, and AI-generated code must be reviewed and understood just like any other contribution.

Question 5

When writing TypeScript for a financial application, which practice best meets professional accuracy standards?

Accepted Answer

Use branded types or a Decimal library to prevent floating-point precision errors in monetary calculations

Answer

Floating-point arithmetic is unsuitable for money; branded types or a Decimal library ensure precision and prevent financial calculation errors.

TypeScript Practice Test

TypeScript Practice Test

TypeScript Professional Standards & Ethics 4