/**
 * Frontmatter key → ADO reference name resolver.
 *
 * Frontmatter in synced markdown files uses raw ADO refnames as keys
 * (e.g. `System.Title`, `Custom.ConsultancyProcess`). A small alias table
 * provides friendly shortcuts for the most common fields so human-written
 * files stay readable.
 *
 * Resolution rules:
 *  1. Reserved keys (sync metadata) are returned as-is with a null refname.
 *  2. Alias → refname lookup (case-sensitive).
 *  3. Unknown keys are passed through unchanged (treated as refnames).
 */
/** Keys that are sync metadata, never sent to ADO as field updates. */
export declare const RESERVED_FRONTMATTER_KEYS: Set<string>;
/**
 * Friendly aliases → ADO reference names. Add entries here when a field is
 * common enough across clients to deserve a short key.
 */
export declare const FIELD_ALIASES: Record<string, string>;
/**
 * Resolve a frontmatter key to its ADO refname, or null if the key is reserved
 * sync metadata.
 */
export declare function resolveRefname(key: string): string | null;
/**
 * When writing frontmatter from ADO data, pick the friendliest key for a given
 * refname (alias if one exists, else the refname itself).
 */
export declare function preferredKey(refname: string): string;
/**
 * True when a frontmatter key is reserved sync metadata (not an ADO field).
 */
export declare function isReservedKey(key: string): boolean;
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