Literal Types

Snippet

Literal types allow you to specify the exact value a string, number, or boolean must have, rather than just any value of that type.

snippet.ts
typescript
let response: "yes" | "no";
response = "yes"; // Success
// response = "maybe"; // Error: Type '"maybe"' is not assignable

Breakdown

let response: "yes" | "no";

Defines a variable that can only hold the exact string 'yes' or 'no'.

response = "yes";

Assigns a valid literal value to the variable.

From your library