({ label, newVarLabel, useIdentifier }: NewDeclarationProps):
   ScopeDeclarationBodyItem =>
   (useIdentifier && newVarLabel)
     // Create a new variable (reassignment)
     ? createVariableDeclaration(label,
       { kind: "identifier", args: { label: newVarLabel } })
     : { // Unassign variable (will not create a new variable name)
       kind: "parameter_declaration",
       args: { label, data_type: "point" }
     };

describe("mergeVariableDeclarations()", () => {
  const declarations: VariableDeclaration[] = [
    coordinateVar("parent1"),
    coordinateVar("parent2"),
  ];

  it("doesn't overwrite declarations", () => {
    const varData = fakeVariableNameSet("parent1");
    const result = mergeVariableDeclarations(varData, declarations);
    expect(result).toEqual(declarations);
  });

  it("adds new declarations", () => {
    // "parent2" will not be added: already exists
    const varData = fakeVariableNameSet("parent2");

    // "parent3" will not be added: already defined
    const notAdded = "parent3";
    varData[notAdded] = fakeVariableNameSet(notAdded)[notAdded];

    // "parent4" will be added to the existing declarations
    const label = "parent4";
    const add = fakeVariableNameSet(label)[label];
    const addedNewDecl: ParameterDeclaration = {
      kind: "parameter_declaration", args: { label, data_type: "point" }
    };
    add && (add.celeryNode = addedNewDecl);
    varData[label] = add;
    const expected = cloneDeep(declarations);
    expected.push({
      kind: "variable_declaration", args: {
        label, data_value: NOTHING_SELECTED
      }
    });

    const result = mergeVariableDeclarations(varData, declarations);
    expect(result).toEqual(expected);
  });
});

 it("returns variable data", () => {
   const declarations: ScopeDeclarationBodyItem[] = [
     coordinateVar("parent2"),
     {
       kind: "parameter_declaration", args: {
         label: "parent1", data_type: "point"
       }
     },
   ];
   const result = getRegimenVariableData(declarations, buildResourceIndex().index);
   expect(result).toEqual({
     parent1: {
       celeryNode: {
         kind: "parameter_declaration",
         args: { label: "parent1", data_type: "point" }
       },
       dropdown: { label: "Parent1", value: "?" },
       vector: undefined
     },
     parent2: {
       celeryNode: coordinateVar("parent2"),
       dropdown: { label: "Coordinate (1, 2, 3)", value: "?" },
       vector: { x: 1, y: 2, z: 3 }
     }
   });
 });

 .map(({ args }) => declared[args.label] || newVar(args.label))