branded-types

SKILL.md

TypeScript uses structural typing, but sometimes you need nominal typing - values that are distinct because you SAY they are, not because they have different shapes. Brands let you do this without runtime overhead.

You can't actually create a value that is both a string and has a brand property:

Response: Type aliases don't prevent mixing up different string types.

Use when primitive types need semantic distinction. Use when string or number types have different meanings. Use when you need nominal typing. Source: marius-townhouse/effective-typescript-skills.

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