/**
 * Verify if the input is an object literal (or class).
 * @param input The object to verify
 */
export declare function isObject(input: unknown): input is Record<PropertyKey, unknown> | object;
/**
 * Check whether a value is a primitive
 * @param input The input to check
 */
export declare function isPrimitive(input: unknown): input is string | bigint | number | boolean;
export declare function isFunction(input: unknown): input is Function;
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