export declare const NOTEBOOK_FORMAT_VERSION = 2;
/**
 * Return the declared notebook format version, or `0` if absent. Missing
 * headers are treated as v0 and upgraded on next write (see committed
 * trade-off #3 in the v0.12 plan: silent forward-upgrade, no rejection).
 */
export declare function readNotebookFormatVersion(source: string): number;
export interface CanonicalizeNotebookOptions {
    /** Override the emitted notebook format version. Defaults to NOTEBOOK_FORMAT_VERSION. */
    version?: number;
}
/**
 * Produce the canonical on-disk JSON representation of a `.dqlnb` source.
 * Always emits `dqlnbVersion` as the first key, sorts object keys, and
 * trails with a single newline.
 *
 * Throws if the source is not valid JSON — callers should catch and fall
 * back to their legacy path during migration.
 */
export declare function canonicalizeNotebook(source: string, options?: CanonicalizeNotebookOptions): string;
export declare function isNotebookCanonical(source: string): boolean;
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