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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | 13x 13x 7x | /**
* Throws when a condition is falsy, and narrows its type otherwise.
*
* @param condition - The value that must be truthy.
* @param message - The message of the error. Defaults to `'Assertion failed'`.
* @throws {Error} When `condition` is falsy.
* @example
* assert(user !== undefined, 'User not loaded');
* user.name; // `user` is no longer `undefined`
*/
export function assert(condition: unknown, message = 'Assertion failed'): asserts condition {
const isTruthy = Boolean(condition);
if (!isTruthy) {
throw new Error(message);
}
}
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