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