Author Archives: lysender

Jest tests failing on CircleCI – ENOMEM: not enough memory

Posted on August 21, 2019 by lysender

Out NestJS tests are intermittently failing with “not enough memory” error being thrown. There is nothing really special about the tests except for the fact that it is growing as the project grows. It turns out a simple CLI parameter … Continue reading →

Posted in NodeJS | Tagged | Leave a comment

TIL – Jest expect to throw error in an async call

Posted on August 13, 2019 by lysender

I just wanted to test that a certain async call should throw an error and I tried it on Jest. I’m already familiar with RSpec which has similar syntax. Below is what I did. The exec method is an async … Continue reading →

Posted in JavaScript | Tagged | 1 Comment

MongoDB ReplicaSet on Docker Environment

Posted on August 10, 2019 by lysender

I was playing around with MongoDB ReplicaSet yesterday in a Docker environment. The purpose is to test the integration with a backend service that connects to MongoDB. It was a very frustrating process especially when done in a local environment … Continue reading →

Posted in Docker, MongoDB | Tagged , | 4 Comments

Docker Compose Environment Variable and Quotes

Posted on June 24, 2019 by lysender

TLDR: Do not put any double quotes or single quotes into the environment parameter in the docker-compose.yml file. Do we really need the long version of the story? Instead of this: Use this instead: Now this is odd as I … Continue reading →

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React Native + Expo + Redux – _react.default.memo is not a function

Posted on June 3, 2019 by lysender

As of early June 2019 using the latest version of Expo, I’m not able to use Redux as I’m getting this error memo is not a function when trying to use connect. Spoiler, it is because Expo is using a … Continue reading →

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Using Base64 encode/decode in a React Native/Expo app

Posted on May 31, 2019 by lysender

I can’t believe that I can’t easily encode and decode Base64 string in React Native without pulling my hair. I’m using Expo to manage my development workflow and it even adds more confusion. Thankfully, a little trick saves me from … Continue reading →

Posted in React Native | Tagged , | 2 Comments

First Metro Securities Change Password Issue

Posted on May 23, 2019 by lysender

When I tried to login to First Metro Securities today, it says that my password already expired and won’t let me log in. I think I went to the classic version and tried to login too but when I changed … Continue reading →

Posted in Investments | Tagged | Leave a comment

React/Expo Uses the Incorrect IP Address in Windows 10

Posted on May 22, 2019 by lysender

My setup is in a Windows 10 machine with VirtualBox installed with a Host Only Network added by VirtualBox. Every time I run expo start it always picks up the VirtualBox network adapter instead of my machine’s Ethernet adapter. Without … Continue reading →

Posted in React | Tagged , | Leave a comment

TypeScript – URLSearchParams iterator typing issue

Posted on May 15, 2019 by lysender

In a certain React course in Udemy, I encountered an issue on React and Typescript where an iterator does not work the way it is shown in the course and this is probably because the course is not written in … Continue reading →

Posted in React, TypeScript | Leave a comment

React + Redux – Component not exported or Redux not connected

Posted on May 9, 2019 by lysender

Hey there, I’m a React and Redux newbie and the annoying issue I’ve encountered is when you connect a component to Redux but the actions are not injected into the component’s props. When you follow the tutorial, it seems straightforward … Continue reading →

Posted in React, Web Development | Tagged | Leave a comment