How to use the dialogflow.IntentsClient function in dialogflow

import * as dialogflow from "dialogflow";

const agentsClient = new dialogflow.AgentsClient();
const contextsClient = new dialogflow.ContextsClient();
const entityTypesClient = new dialogflow.EntityTypesClient();
const intentsClient = new dialogflow.IntentsClient();
const sessionEntityTypesClient = new dialogflow.SessionEntityTypesClient();
const sessionsClient = new dialogflow.SessionsClient();

// TODO: Add real significant tests

async function listIntents(projectId) {
  // [START dialogflow_list_intents]
  // Imports the Dialogflow library
  const dialogflow = require('dialogflow');

  // Instantiates clients
  const intentsClient = new dialogflow.IntentsClient();

  // The path to identify the agent that owns the intents.
  const projectAgentPath = intentsClient.projectAgentPath(projectId);

  const request = {
    parent: projectAgentPath,
  };

  console.log(projectAgentPath);

  // Send the request for listing intents.
  const [response] = await intentsClient.listIntents(request);
  response.forEach(intent => {
    console.log('====================');
    console.log(`Intent name: ${intent.name}`);
    console.log(`Intent display name: ${intent.displayName}`);

async function deleteIntent(projectId, intentId) {
  // [START dialogflow_delete_intent]
  // Imports the Dialogflow library
  const dialogflow = require('dialogflow');

  // Instantiates clients
  const intentsClient = new dialogflow.IntentsClient();

  const intentPath = intentsClient.intentPath(projectId, intentId);

  const request = {name: intentPath};

  // Send the request for deleting the intent.
  const result = await intentsClient.deleteIntent(request);
  console.log(`Intent ${intentPath} deleted`);
  return result;
  // [END dialogflow_delete_intent]
}

async function createIntent(
  projectId,
  displayName,
  trainingPhrasesParts,
  messageTexts
) {
  // [START dialogflow_create_intent]
  // Imports the Dialogflow library
  const dialogflow = require('dialogflow');

  // Instantiates the Intent Client
  const intentsClient = new dialogflow.IntentsClient();

  // The path to identify the agent that owns the created intent.
  const agentPath = intentsClient.projectAgentPath(projectId);

  const trainingPhrases = [];

  trainingPhrasesParts.forEach(trainingPhrasesPart => {
    const part = {
      text: trainingPhrasesPart,
    };

    // Here we create a new training phrase for each provided part.
    const trainingPhrase = {
      type: 'EXAMPLE',
      parts: [part],
    };