export interface ChangedSubjects {
    readonly range: string;
    readonly concepts: readonly string[];
    readonly relationships: readonly string[];
    /** Subjects whose entire declaration is new in the range (subset of
     *  concepts + relationships); the rest changed in place. */
    readonly added: readonly string[];
}
export type ChangedResult = {
    readonly ok: true;
    readonly changed: ChangedSubjects;
} | {
    readonly ok: false;
    readonly message: string;
};
export declare const lineOfOffset: (lineStarts: readonly number[], offset: number) => number;
export interface DiffRanges {
    readonly touched: ReadonlyArray<readonly [number, number]>;
    readonly inserted: ReadonlyArray<readonly [number, number]>;
}
export declare const changedLineRanges: (diff: string) => DiffRanges;
export declare function deriveChangedSubjects(cwd: string, range: string, documents: ReadonlyArray<{
    readonly path: string;
    readonly source: string;
    readonly documentId: string;
}>): ChangedResult;