It appears that the repository has undergone several changes and renamings:

backend/node_modules/lines-and-columns/build/index.d.ts

@@ -1,13 +0,0 @@
-export declare type SourceLocation = {
-    line: number;
-    column: number;
-};
-export declare class LinesAndColumns {
-    private string;
-    private offsets;
-    constructor(string: string);
-    locationForIndex(index: number): SourceLocation | null;
-    indexForLocation(location: SourceLocation): number | null;
-    private lengthOfLine;
-}
-export default LinesAndColumns;