Node/Deno でソースコードにテストを書く
tl;dr ファイルをそれ単独で単体テストとして実行するボイラープレートを編み出した そのヘルパとして mizchi/test という実装を作った なぜソースコードにテストを書きたいか Rust や Python の doctest ではソースコードにテストを書く方法があります。 ソースコードにテストを書けると、コードとテストの心理的な距離が近くなってテストが書きやすくなる、という肌感があります。(諸説あります) 実装とテストが混ざって汚れるのが嫌という意見も理解できますが、それはありつつ認めた上で、あとでリファクタする前提で最初の一歩をその実装に書けると嬉しい、という気持ちがあります。 現状の Node だととりあえず assert するだけという単純なテストを書くことは可能ですが、構造化する方法がないので、簡単なスクラッチの時ぐらいしか行われません。 // test.js import
A Visual Guide to NodeJS Streams
Background Image Courtesy: Photo by Joshua Sortino on UnsplashImagine you have a pile of bricks somewhere. And you want to build a wall with those bricks here. Let’s say you have a friend to help move the bricks. To start building, you now have two options. You can either wait until your friend brings the whole pile of bricks to you, or you can start building as soon as you have a few bricks to st
Node.jsでの標準入力の書き方をまとめてみた - Qiita
var input = require("fs").readFileSync("/dev/stdin", "utf8"); console.log(input); 標準入力を表す特殊ファイル(/dev/stdin)をreadFileSyncで読み込みます。 メリット : 記述がかなりシンプル デメリット: /dev/stdinはUNIX系のOSでしか利用できないので、Windowsでは利用できない 2. process.stdinをreadlineモジュールを利用して読む process.stdin.setEncoding("utf8"); var lines = []; var reader = require("readline").createInterface({ input: process.stdin, }); reader.on("line", (line) => { //改
Lazy Load Routes in Vue with webpack Dynamic Comments | CSS-Tricks
The way routing works in JavaScript is usually that you specify which relative URL pattern you want for which component to render. So for /about you want the <About /> component to render. Let’s take a look at how to do this in Vue/Vue Router with lazy loading, and do it as cleanly as possible. I use this little tip all the time in my own work. A repo that includes everything covered in this post
Deno in 2020
With API stabilizations, several large infrastructure refactors, the 1.0 release, and shipping the single most requested feature, 2020 brought a lot of action to the Deno project. Please fill out the Deno survey to help guide our development in 2021. Read on for Deno’s review of the year. January: Goodbye libdeno, hello rusty_v8libdeno was a C++ library that facilitated an interface between V8 eng
How To Secure Node.js Applications with a Content Security Policy | DigitalOcean
The author selected the Free Software Foundation to receive a donation as part of the Write for DOnations program. Introduction When the browser loads a page, it executes a lot of code to render the content. The code could be from the same origin as the root document, or a different origin. By default, the browser does not distinguish between the two and executes any code requested by a page regar
Using Buffers in Node.js | DigitalOcean
The author selected the COVID-19 Relief Fund to receive a donation as part of the Write for DOnations program. Introduction A buffer is a space in memory (typically RAM) that stores binary data. In Node.js, we can access these spaces of memory with the built-in Buffer class. Buffers store a sequence of integers, similar to an array in JavaScript. Unlike arrays, you cannot change the size of a buff
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The Secret Parameter, LFR, and Potential RCE in NodeJS Apps