How to use the graphql-language-service-utils.offsetToPosition function in graphql-language-service-utils

function getDefinitionForFragmentDefinition(
  path: Uri,
  text: string,
  definition: FragmentDefinitionNode,
): Definition {
  return {
    path,
    position: offsetToPosition(text, definition.name.loc.start),
    range: locToRange(text, definition.loc),
    name: definition.name.value,
    language: LANGUAGE,
    // This is a file inside the project root, good enough for now
    projectRoot: path,
  };
}

const meta = node => ({
    representativeName: node.name,
    startPosition: offsetToPosition(docText, node.loc.start),
    endPosition: offsetToPosition(docText, node.loc.end),
    children: node.selectionSet || [],
  });
  return {

function getPosition(text: string, node: ASTNode): Position {
  const location = node.loc as Location;
  invariant(location, 'Expected ASTNode to have a location.');
  return offsetToPosition(text, location.start);
}

const meta = (node: any) => ({
    representativeName: node.name,
    startPosition: offsetToPosition(docText, node.loc.start),
    endPosition: offsetToPosition(docText, node.loc.end),
    children: node.selectionSet || [],
  });

const meta = node => ({
    representativeName: node.name,
    startPosition: offsetToPosition(docText, node.loc.start),
    endPosition: offsetToPosition(docText, node.loc.end),
    children: node.selectionSet || [],
  });
  return {