/** Strip a leading `#`, trim, and lowercase a user-supplied tag value. */
export declare function normalizeTagValue(raw: string): string;
/**
 * A valid tag value: lowercase letters, digits and hyphens, with at least one
 * letter (so a markdown heading like `# 1` never reads as a tag). Mirrors the
 * shared parser's requirement.
 */
export declare function isValidTagValue(value: string): boolean;
/** True if `#value` already appears as a real tag token in the content. */
export declare function hasTag(content: string, value: string): boolean;
/** Append `#value` (on its own trailing line) if not already present. */
export declare function addTag(content: string, value: string): string;
/** Remove every `#value` token, preserving the boundary char before it. */
export declare function removeTag(content: string, value: string): string;
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