TypeScript tutorialLesson 14Free preview

TS Casting

This lesson is part of TypeScript · All levels

Summary

Casting or type assertion tells the compiler that you know the actual type better than the result of the inference. The syntax can be either an ace keyword or a generic form in square brackets. The assertion doesn't change the runtime value, it just affects the type check.

Key points

The assertion does not change the value at runtime
Syntax: x as T or <T>x
Unknown is often used as a bridge of double assertion

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