/**
 * Shared scalar utility functions for document-api adapters.
 */
/**
 * Returns the value as a string if it is a non-empty string, otherwise `undefined`.
 *
 * @param value - The value to test.
 */
export declare function toNonEmptyString(value: unknown): string | undefined;
/**
 * Coerces a value to a finite number. Accepts numbers and numeric strings.
 *
 * @param value - The value to coerce.
 * @returns A finite number, or `undefined` if the value cannot be coerced.
 */
export declare function toFiniteNumber(value: unknown): number | undefined;
/**
 * Coerces a value to a stable ID string. Accepts non-empty strings and finite numbers.
 *
 * @param value - The value to coerce.
 * @returns A string ID, or `undefined` if the value is not a valid identifier.
 */
export declare function toId(value: unknown): string | undefined;
/**
 * Extracts a comment ID from node attributes, checking `commentId`, `importedId`, and `w:id` in order.
 *
 * @param attrs - The attributes record to search.
 * @returns The first non-empty comment ID found, or `undefined`.
 */
export declare function resolveCommentIdFromAttrs(attrs: Record<string, unknown>): string | undefined;
/**
 * Normalizes whitespace in a text excerpt and returns `undefined` for empty results.
 *
 * @param text - The raw text to normalize.
 * @returns Trimmed text with collapsed whitespace, or `undefined` if empty.
 */
export declare function normalizeExcerpt(text: string): string | undefined;
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