The 'unknown' Type

Snippet

The 'unknown' type is a safer version of 'any'. You cannot perform operations on an 'unknown' value until you verify its type using a type check.

snippet.ts
typescript
let input: unknown = "Hello";
 
if (typeof input === "string") {
  console.log(input.toUpperCase());
}

Breakdown

let input: unknown = "Hello";

Declares a variable that could be anything, but its type is currently 'unknown'.

if (typeof input === "string") {

A type guard that narrows the type from 'unknown' to 'string' inside the block.

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