TypeScript: `interface` vs type aliases — компромиссы?

Компромиссы

• Prefer interface для public/exported object и class contracts — лучше errors, consumers augment. Historical TS default: interface unless only type can.
• Prefer type для unions, tuples, functions, computed (mapped/conditional, template literals). Не style — interfaces literally cannot.
• Declaration merging double-edged. Essential augmentation, но shape interface не guaranteed в одном месте — footgun для internal closed definitions.
• Consistency > dogma. Team rule («type by default, interface when merging/OO») — practical diff small, arbitrary mix — cognitive load.

Итог

Public object contracts → interface; unions/computed → type; consistency важнее dogma.