chore: use type instead of interface

[MichaelDeBoey]

No description provided.

[RunDevelopment]

May I ask what motivates this change?

[MichaelDeBoey]

@RunDevelopment As I already explained in eslint-community/eslint-utils#60 (comment)

• Interfaces can't express unions, mapped types, or conditional types. Type aliases can express any type.
• Interfaces with the same name in the same scope merge their declarations, leading to unexpected bugs.
• Type aliases have an implicit index signature of Record<PropertyKey, unknown>

[RunDevelopment]

I see. Thank you for sharing, I didn't know about point 3.

That being said, I don't think using type will be possible here. Type expressions are difficult for TS to make sense of when they contain cycles.

[voxpelli]

Though interfaces can eg. be extended, and that's preferred over using intersections: https://github.com/microsoft/TypeScript/wiki/Performance#preferring-interfaces-over-intersections