export interface MarkdownDoc {
    frontmatter: Record<string, unknown>;
    body: string;
    hasFrontmatter: boolean;
}
export declare function isPlainRecord(value: unknown): value is Record<string, unknown>;
export declare function asString(value: unknown): string | null;
export declare function asBoolean(value: unknown): boolean | null;
export declare function asStringArray(value: unknown): string[] | null;
export declare function parseFrontmatterMarkdown(raw: string): MarkdownDoc;
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