export declare function isFalsyAttrValue(value: string | undefined): boolean;
/** True when `name` is safe to emit as an attribute name. */
export declare function isSafeAttrName(name: string): boolean;
/** True when `name` is safe to emit as a tag name. */
export declare function isSafeTagName(name: string): boolean;
/**
 * Render an attribute record to a ` k="v"` string, dropping unsafe names and
 * neutralising script-bearing URLs. Returns "" when nothing survives.
 */
export declare function renderAttrs(attrs?: Record<string, string>, booleans?: ReadonlySet<string>): string;
/** Error box matching the style other handlers use for malformed input. */
export declare function renderBlockError(message: string): string;
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