graphql-mocks/es/relay/apply-cursor-to-edges.js

Tools for setting up graphql test resolvers

function applyCursorsToEdges(edges, cursorForNode, before, after) {
  var frontCut = false;
  var backCut = false;

  if (after) {
    var afterEdge = edges.find(edge => cursorForNode(edge.node) === after);
    if (!afterEdge) throw new Error("".concat(after, " doesn't appear to be a valid edge"));
    var afterEdgeIndex = edges.indexOf(afterEdge);
    var sliced = edges.slice(afterEdgeIndex + 1, edges.length);
    frontCut = sliced.length !== edges.length;
    edges = sliced;
  }

  if (before) {
    var beforeEdge = edges.find(edge => cursorForNode(edge.node) === before);
    if (!beforeEdge) throw new Error("".concat(before, " doesn't appear to be a valid edge"));
    var beforeEdgeIndex = edges.indexOf(beforeEdge);

    var _sliced = edges.slice(0, beforeEdgeIndex);

    backCut = _sliced.length !== edges.length;
    edges = _sliced;
  }

  return {
    edges,
    frontCut,
    backCut
  };
}

export { applyCursorsToEdges };
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