export type FrontmatterValue = string | string[];
export type Frontmatter = Record<string, FrontmatterValue>;
export declare function timestamp(): string;
export declare function readFileSafe(filePath: string): Promise<string | null>;
export declare function ensureDir(dirPath: string): Promise<void>;
export declare function isNodeError(err: unknown): err is NodeJS.ErrnoException;
export declare function stripFrontmatter(content: string): string;
export declare function parseFrontmatter(content: string): Frontmatter;
export declare function frontmatterString(fm: Frontmatter, key: string): string | undefined;
export declare function frontmatterArray(fm: Frontmatter, key: string): string[] | undefined;
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