/** Scalars and string lists rendered as JSON, which YAML reads as the same values. */
export type YamlEntryValue = string | number | boolean | readonly string[] | Readonly<Record<string, string>>;
/** `text` with `<topKey>.<name>` set to `fields`, replacing an entry of that name. */
export declare function upsertYamlEntry(text: string, topKey: string, name: string, fields: Record<string, YamlEntryValue>): string;
/** Whether `<topKey>.<name>` exists as a block entry. */
export declare function hasYamlEntry(text: string, topKey: string, name: string): boolean;