While developing, you frequently encounter red error messages due to mistakes in the code. It's fortunate if bugs are found during development, but seeing an error message in a live service can make a...

When I have a repetitive task, I tend to create an optimized routine that suits me best and follow it thoughtlessly each time I do the task. I don't stubbornly stick to a fixed routine, though. I grad...

When you're a working professional, your attitude towards work naturally develops, much like a character. The same applies to developers. Being a junior doesn't mean having a bad attitude, nor does ex...

(Updated 2022-03-04: Configuration code related to webpack-dev-server, babel, and jest has been modified.) In Part 1, we built a basic JavaScript development environment with Lerna. While the basic se...

(Updated 2022-03-04: Configuration code for webpack-dev-server, babel, and jest has been modified.) Sometimes when developing, you want to quickly write code in a specific environment and check the re...