/**
 * Opt-in capture of every `word/document.xml` the engine emits, so an
 * external OOXML schema validator can check the whole corpus after a test
 * run. No-op (zero I/O) unless `SDX_SCHEMA_CORPUS_DIR` is set.
 *
 * Files are named by content hash, so repeated emissions of the same XML
 * deduplicate and the corpus stays bounded across a full test run. The
 * consumer is `scripts/check_emitted_document_schema.mjs`, which validates
 * the captured corpus against the vendored Transitional WML schema.
 *
 * Capture sites are the three emission choke points: comparison pipelines
 * (`DocxArchive.setDocumentXml`), primitives saves (`DocxDocument.toBuffer`),
 * and generation (`generateDocx`). Capture failures propagate: when the
 * corpus is requested, a partially written corpus must not validate cleanly.
 *
 * @see https://github.com/UseJunior/safe-docx/issues/214
 */
export declare function maybeCaptureEmittedDocumentXml(xml: string): void;
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