/**
 * Parse a barrel entry file and return the base package names of every
 * `export ... from '<specifier>'` whose specifier is a bare (external) package —
 * i.e. not a relative (`./`, `../`) or `node:` import.
 *
 * Unlike `collectExternalUsage`, this intentionally parses `.d.ts` files:
 * published packages ship only `dist/*.d.ts` + `dist/*.mjs` with no `src/`, and
 * the re-export chain is fully visible in either form.
 */
export declare function getReExportSpecs(file: string): string[];
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