import { postcss } from "opticss";
import { Block } from "../../BlockTree";
import { Configuration } from "../../configuration";
/**
 * For each `extends` property found in the passed ruleset, set the block's base
 * to the foreign block. If block is not found, throw.
 * @param block  Block object being processed.
 * @param sourceFile  Source file name, used for error output.
 * @param root Ruleset to crawl.
 */
export declare function extendBlock(configuration: Configuration, root: postcss.Root, block: Block, sourceFile: string): void;
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