import type { CoreRoot, IssueColumns, IssueRecord, Preset } from './core/engine.js';
export type ModelPatch = {
    acId?: string;
    patch: Record<string, unknown>;
};
export type ModelEditResult = {
    body: string;
    columns: IssueColumns;
    changed: boolean;
};
/** Overlay a typed fragment onto an issue (or one AC) and re-serialize to { body, columns }. */
export declare function applyModelPatch(preset: Preset<CoreRoot>, record: IssueRecord, edit: ModelPatch): ModelEditResult;
/** `fmt`: the preset's own round-trip, parse -> serialize, preserving the `## Waivers` section. */
export declare function canonicalizeBody(preset: Preset<CoreRoot>, record: IssueRecord): ModelEditResult;