/**
 * `parseHeader` — the orchestrator.
 *
 * Layer 2. Sole owner of header validation ORDER. Every check below is numbered, and the numbers
 * are the contract: under `strict` the FIRST would-be diagnostic throws, so the order decides
 * which error a broken file reports, and a test pins it. Moving a check is a behavioural change
 * even when every individual check is unaltered.
 *
 * The order is not arbitrary. Each step establishes something the next one needs:
 *
 *   1. at least 256 bytes            8. the record size, hence the file geometry
 *   2. the variant, hence sample width    9. the record count, which needs 8 and the source size
 *   3. ns, before any ns-sized work      10. the EDF+ annotations requirement
 *   4. the whole header is present       11. the text fields, which nothing else depends on
 *   5. the declared header size (loses)
 *   6. the record duration
 *   7. the per-signal blocks
 *
 * `sourceByteLength` is required and positional because two of those steps genuinely need the
 * size of the file the header came from: recovering `recordCount = -1`, and telling a truncated
 * file from a complete one.
 */
import type { EdfHeader, ParseOptions } from '../types.js';
/**
 * Parse an EDF/BDF header.
 *
 * `headerBytes` must hold at least `256 * (ns + 1)` bytes; anything beyond that is ignored, so a
 * caller that over-read is free to pass its whole buffer. `sourceByteLength` is the size of the
 * file those bytes came from — pass `bytes.byteLength` for an in-memory file.
 */
export declare function parseHeader(headerBytes: Uint8Array, sourceByteLength: number, options?: ParseOptions): EdfHeader;
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