/**
 * Asserts that a value is defined and non-null, throwing otherwise.
 * @param expr - Value to check.
 * @param message - Error message when the value is nullish.
 * @returns The non-nullish value.
 * @deprecated use from @xylabs/with instead
 */
export declare const assertDefinedEx: <T>(expr?: T | null, message?: string) => T;
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