devBlog of Michal Zalecki

Docker Compose for Node.js and PostreSQL

Docker is the response to an ongoing problem of differences between environments in which application runs. Whether those differences are across machines of the development team, continuous integration server, or production environment. Since you are reading this, I assume you are already more or less familiar with benefits of containerizing applications. Let’s go straight to Node.js specific bits.

Deploying smart contracts with Truffle

Truffle provides a system for managing the compilation and deployment artifacts for each network. To make an actual transaction and put a smart contract on-chain we have to provide Truffle with an appropriate configuration. We configure each network separately. From this post, you will learn how to prepare a setup and deploy to a few widely used test networks.

Ethereum: Test-driven development with Solidity (part 2)

This is the second part of the test-driven introduction to Solidity. In this part, we use JavaScript to test time-related features of our smart contract. Apart from that, you will see how to check for errors. We will also complete the rest of the smart contract by adding withdrawal and refund features.

Ethereum: Test-driven development with Solidity (part 1)

Depends on how you count, second and third generation blockchain applications are not bound by restrictions of underlying protocols. Programmers can create smart contracts — distributed applications with access to code-controlled accounts. Use cases go far beyond exchanging value and applies where users benefit from replacing trust between parties with code.

Using Sequelize with TypeScript

Sequelize is an ORM for Node.js written in JavaScript, not TypeScript. Despite that good quality typings are available, it is not straightforward how to get up to speed with Sequelize and TypeScript. I would like to go through crucial elements and show how to maximize safety coming from static typing when using Sequelize. Let’s start with setting things up.

Convert files for the web from your terminal

For me, using a terminal is fundamental to tasks automation. I love to augment my workflow using a command line tools. One of the things I try to automate is preparing assets for using them in web apps. This post is a kind of documentation to me.

Nominal typing techniques in TypeScript

Many functional programming languages like Haskell or Elm have a structural type system. This perfectly lines in with the direction in which majority of JavaScript’ish community is heading. Nevertheless, every feature comes with a certain set of trade-offs. Choosing structural type system allows for a greater flexibility but leaves a room for a certain class of bugs. What I find interesting is that the answer to the question whether TypeScript, Flow or any other type system adopts structural or nominal type system does not have to be binary. So, is it possible to have the best of both worlds writing in TypeScript?

Testing redux-thunk like you always want it

Redux Thunk is one of the most if not the most popular Redux middleware with over 2 million downloads a month. If you compare this number to the Redux 4 million downloads a month, it is easy to figure out that over half of Redux projects are using Redux Thunk. As the name “thunk” suggests, the main goal of Redux Tunk is to allow for lazy evaluation (dispatching) of actions. While this makes it possible to dispatch actions in an asynchronous manner, it also makes it harder to test.

Fixtures, the way to manage sample and test data

Fixtures are a thin abstraction layer over sample data in your application which allows for better organizing, often complex, data structures representing different entities. If this sounds like a vague description or does not ring the bell maybe an example will speak to you better.

Creating a TypeScript library with a minimal setup

There are a few major reasons due to which you may find yourself creating a library. One, obviously, is that you have a solution which you would like to share with the Open Source community. The other one is that you need to reuse code across different projects or in the same project but on different platforms.

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