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$ curl repovive.com/roadmaps/javascript/introduction-to-typescript/type-assertions

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$ curl repovive.com/roadmaps/javascript/introduction-to-typescript/type-assertions

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Type Assertions - Introduction to TypeScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

Open in Course

Type Assertions

Tell TypeScript you know better

Type assertions tell TypeScript to treat a value as a specific type:

const el = document.querySelector("#btn") as HTMLButtonElement;
el.disabled = true;

// Alternative syntax
const el2 = <HTMLButtonElement>document.querySelector("#btn");

Use assertions when you know more than TypeScript can infer. Don't use them to hide errors.