TypeScript tutorialLesson 31Free preview

TS Literal Types

This lesson is part of TypeScript · All levels

Summary

The literal type limits a type only to certain values, for example just "public" or just the number 42. The value with the as const retains the literal so that the type does not expand into a common string or number. This technique makes the configuration and API much more rigorous.

Key points

The literal union limits the list of values
Keeping the literal value
Without the as, the literal expands into the general type

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