Function validateNoMutations

packages/graph/src/index.ts:118–127

* Validates that a step array contains no mutation steps. * Recursively checks ContainerStep subclasses for nested mutations. * @throws ReadonlyGraphError if a mutation step is found.

(steps: readonly Step<any>[])

 * @throws ReadonlyGraphError if a mutation step is found.
 */
function validateNoMutations(steps: readonly Step<any>[]): void {
  for (const step of steps) {
    if (MUTATION_STEP_NAMES.has(step.name)) {
      throw new ReadonlyGraphError(step.name);
    }
    if (step instanceof ContainerStep) {
      validateNoMutations(step.steps);
    }
  }
}

export interface ParseQueryToStepsOptions {
  /**