Generate a hex encoded HMAC-SHA256 hash using Crypto in Nodejs

How to generate an encoded hash in nodejs using crypto

import { Service } from './service';
import crypto from 'crypto';

export class TestService extends Service {
    private _secretKey: string;

    constructor() {
        this._secretKey = '1234567890';
		this._userId = '123';

     * Get Hex encoded hash of secret key
    private GetHashKey(): string {
        return crypto
            .createHmac('sha256', this._secretKey)

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