What is the difference between interface and type?

Interfaces are extendable and can be merged, while types are more flexible and can represent unions and intersections. Both work for defining object shapes.

How are arrays handled?

Arrays are detected and typed appropriately. If all elements are of the same type, a typed array is generated. Mixed types result in union types.

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Frequently Asked Questions

What is the difference between interface and type?: Interfaces are extendable and can be merged, while types are more flexible and can represent unions and intersections. Both work for defining object shapes.
How are arrays handled?: Arrays are detected and typed appropriately. If all elements are of the same type, a typed array is generated. Mixed types result in union types.

Sources & references

Primary references: TypeScript Handbook: Object Types.

Last reviewed: 2026-07-13