/**
 * Asserts that a value is not null or undefined, throwing an error if it is.
 * This is a type guard that narrows the type to exclude null and undefined.
 *
 * @param value - The value to check
 * @returns The value with null and undefined excluded from its type
 * @throws Error if the value is null or undefined
 */
export declare const assertValue: <T>(value: T) => NonNullable<T>;
/**
 * Removes a key from an object immutably without using `delete`.
 * Using destructuring instead of `delete` avoids V8 de-optimization
 * that can occur when objects have properties deleted.
 *
 * @param obj - The object to remove the key from
 * @param key - The key to remove
 * @returns A new object without the specified key, or the original object if key doesn't exist
 */
export declare function omitKey<T extends Record<string, unknown>>(obj: T, key: string): T;
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