/**
 * Bare specifiers that should be rewritten to their pinned npm: versions.
 * Each must have a corresponding entry in deno.json's import map.
 */
declare const REWRITABLE_PACKAGES: readonly [];
interface RewriteRule {
    pattern: RegExp;
    replacement: string;
}
declare function buildRules(importMap: Record<string, string>): RewriteRule[];
/**
 * Returns rewrite rules derived from deno.json's import map.
 * Rules are cached per resolved project directory.
 */
export declare function getNpmRewriteRules(baseDir?: string): RewriteRule[];
/**
 * Apply npm import rewrites to source code.
 * Rewrites bare specifiers to pinned npm: versions from deno.json.
 * No-op on Node.js where bare specifiers resolve via node_modules.
 */
export declare function rewriteNpmImports(source: string, baseDir?: string): string;
/** Exported for testing */
export { buildRules, REWRITABLE_PACKAGES };
/** @internal Reset cached rules — only for testing */
export declare function _resetCache(): void;
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