Function createTraverser

packages/graph/src/Steps.ts:158–171

(steps: readonly Step<any>[])

 * Create a traverser from a list of steps.
 */
export function createTraverser(steps: readonly Step<any>[]) {
  if (steps.length === 0) {
    throw new Error("At least one step is required.");
  }
  const head = new Traverser(steps[0]!);
  let current = head;
  for (let i = 1; i < steps.length; i++) {
    const next = new Traverser(steps[i]!);
    current.next = next;
    next.previous = current;
    current = next;
  }
  return head;
}

type StepStringToken =
  | { kind: "start" }