19 lines
505 B
TypeScript
19 lines
505 B
TypeScript
|
/**
|
||
|
|
* Asserts that a case in a switch statement is unreachable.
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* // Exhaustively checks `user.role` type ("admin" | "user") and will not compile
|
||
|
|
* // if a new role is added without adding a case to the switch statement.
|
||
|
|
* switch (user.role) {
|
||
|
|
* case "admin":
|
||
|
|
* break;
|
||
|
|
* case "user":
|
||
|
|
* break;
|
||
|
|
* default:
|
||
|
|
* assertUnreachable(user.role);
|
||
|
|
* }
|
||
|
|
*/
|
||
|
|
export function assertUnreachable(value: never): never {
|
||
|
|
throw new Error(`Unreachable case: ${value}`);
|
||
|
|
}
|