import { FullPosition } from '../base/Position';
/**
 * Deep copy a string to avoid sharing the original text reference from TypeScript AST nodes.
 * This ensures that model objects do not implicitly depend on AST node lifecycles.
 */
export declare function cloneText(text: string): string;
/**
 * Extracts source text from the given source code using the specified full position.
 * @param sourceText - The source code text, or undefined if not available.
 * @param position - The full position (start/end line/col) specifying the range to extract.
 * @returns The extracted source text, or undefined if:
 *          - sourceText is undefined or empty
 *          - position is undefined or FullPosition.DEFAULT
 *          - position has invalid line/col values (<=0)
 *          - position exceeds the source text boundaries
 */
export declare function extractSourceTextByFullPosition(sourceText: string | undefined, position: FullPosition | undefined): string | undefined;
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