import { postcss } from "opticss";
import { Block } from "../../BlockTree";
import { Configuration } from "../../configuration";
/**
 * Verify that the external block referenced by a `rule` selects an Attribute that
 * exists in the external block and is exposed as a global.
 * @param block The current block making the external reference.
 * @param rule The rule referencing the external block.
 * @param obj The parsed node making the external reference.
 */
export declare function assertForeignGlobalAttribute(configuration: Configuration, root: postcss.Root, block: Block, file: string): void;
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