Typescriptでprivateメソッドをテストしたかったが単純にメソッドにアクセスしようとすると怒られたので、 どうやったらテストできるか調べてみた。 How 以下の例で見ていく。
Typescriptでprivateメソッドをテストする - Qiita
Typescriptでprivateメソッドをテストしたかったが単純にメソッドにアクセスしようとすると怒られたので、 どうやったらテストできるか調べてみた。 How 以下の例で見ていく。
How to Use TypeScript for AWS Lambda in 3 Steps
AWS Lambda/NodeJS (TypeScript) SeriesHow to Use TypeScript for AWS Lambda in 3 StepsUnit Test and Integration Test for AWS Lambda/NodeJS in TypeScriptSituationWhen we are using NodeJS as the runtime for AWS Lambdas, JavaScript is the default language. However, due to the lack of typing checking in JavaScript, from time to time, buggy code is deployed to Lambda inadvertently. Such as a small typo l
Tagged Union Types in TypeScript
November 3, 2016TypeScript 2.0 implements a rather useful feature: tagged union types, which you might know as sum types or discriminated union types from other programming languages. A tagged union type is a union type whose member types all define a discriminant property of a literal type. Because the above definition is rather theoretical, we're going to be looking at two examples that illustra
なんでみんなRunJS使わないのかわからない - Qiita
※タイトルは煽りです。 TL;DR RunJSは手元で手軽にJSの挙動を試せるアプリ めちゃくちゃ便利と思うのに紹介記事もあんまない 使ったら捗るからどうぞ Qiitaでも紹介記事見かけないし、Googleで検索かけても（少なくとも日本語の記事は）見当たらなかったので書く。 使ったら捗るのになー、というお気持ちです。 RunJS is 何？ 簡単に言うと、JavaScriptのサンドボックス（PlayGround？）。 自分の場合、これまでさくっとコード試したいときは、Chromeのdevtoolでコンソールに書くとかnodeのREPL使うかだったんですが、devtoolはブラウザ開いて、devtool開いて、しかもあまり書きやすいとは言えず・・・、だし、nodeのREPLは単行とかならいいけど、複数行に渡ると辛さしかないですし・・・。 そこでお兄さん。 RunJSですよ。 というわけで、
Type-safe Asynchronous Actions (Redux Thunk) Using TypeScript FSA
Type-safe Asynchronous Actions (Redux Thunk) Using TypeScript FSA If you haven't read the previous blog post (which describes FSA and the TypeScript FSA library), please read it before continuing. In this article, I cover the creation and usage of Typesafe actions and the way to unit test reducers that use asynchronous actions. Before going any deeper I'll explain a few concepts before going into
Tech Notes: TypeScript at Google
I've been working on TypeScript for over two years now(!) so I thought I'd write a post or two to reflect. I should open with the standard disclaimer: I am just a random engineer at a company with tens of thousands of them, and that others surely disagree with the opinions expressed here. Google embraced web applications early. Can you believe it's been 14 years since Gmail was released? JavaScrip
Five tips I wish I knew when I started with Typescript
Because everything really started with Typescript 2.0 ;)(Disclaimer: opinionated article) I have now been working with Typescript for a year on an important codebase for trainline.com. I can tell you it has been a very pleasant experience and I am very much convinced Typescript is worth adopting when you work with many developers on the same codebase. So if you think Typescript could help you, I w
Announcing TypeScript 3.0 | TypeScript
TypeScript 3.0 is here! Today marks a new milestone in the TypeScript journey, serving JavaScript users everywhere.If you’re unfamiliar with TypeScript, it’s not too late to learn about it now! TypeScript is an extension of JavaScript that aims to bring static types to modern JavaScript. The TypeScript compiler reads in TypeScript code, which has things like type declarations and type annotations,
Best practices for using Typescript with React
by Christopher Diggins Best practices for using Typescript with ReactType theory for the win!!!There are numerous tools and tutorials to help developers start writing simple React applications with TypeScript. The best practices for using TypeScript in a larger React application are less clear, however. This is especially the case when intergrating with an ecosystem of third party libraries used t
15K 行のアプリを TypeScript 1.8 から 2.0 に移行してみた - はやくプログラムになりたい
先日 TypeScript の新しいメジャーバージョン 2.0 のコンパイラの beta 版がリリースされました． Announcing TypeScript 2.0 Beta What's new in TypeScript コンパイラのチェックの強化や非 null 型，tagged union など，いくつかの機能が追加・強化され，自分の趣味プロジェクトでも恩恵に与れそうだったので試しに移行してみました． 移行してみたのは下記の Electron でつくり中の Twitter Client アプリ（React+Redux）で，全体で大体 15000 行ぐらいです． github.com 下記の手順で修正してみました． コンパイラをアップデートしてビルドしてみる --noImplicitThis，--noUnusedLocals, --noUnusedParameters を有効にしてみ
TypeScript、僕が悪かった、ゴメン： nullやundefinedの扱いはマトモだった - 檜山正幸のキマイラ飼育記 (はてなBlog)
TypeScript、お前もか： nullやundefinedの扱いがイイカゲン過ぎ ごめんなさい。↑の記事、僕がうかつな事を書きました。TypeScriptのコンパイラにオプションを付ければ、nullとundefinedに関してキチンとチェックします。 きびしいチェックをするオプション付きなら、null型もundefined型もシングルトン型になります。 型 デフォルトでの値の集合 きびしくチェックしたときの値の集合 null {null, undefined} {null} undefined {null, undefined} {undefined} void {null, undefined} {undefined} 事の発端と顛末 TypeScriptの列挙型の挙動を知りたくて、enum OnlyOne {ONE} のサンプルを書いて試したら、nullが入っていて驚いた、というの
Improved Redux type safety with TypeScript 2.8
Disclaimer: This post was created 35000 feet above the ground in the sky, during my return flight from awesome Japan and yes that guy in the title picture is me, ridding the best powder on the planet in Japan :D ( sorry I just had to do this, you can hate me later ok? / later === after reading this post ) Some time ago I wrote about how to effectively leverage TypeScript to write type-safe action
Interface vs Type alias in TypeScript 2.7
People often ask me ( online, at work, in skatepark (nope 😂) ), what’s the difference between using type and interface for defining compile time types within TypeScript. First thing I used to do, was pointing them to TypeScript handbook… Unfortunately most of the time, they didn’t find the droids that they were looking for ( it’s hidden within Advanced Types section). Even if they found it, the i
Type-Safe Object Merging (TypeScript 2.8 Edition)
There are times when you want to merge two generic types in TypeScript, and type inference just isn’t doing it for you. Object.assign’s typing isn’t as precise as it could be, and spreading generics still doesn’t work. I’ve found a way to implement typing when merging objects using some of the new features in TypeScript 2.8. A Sample Problem Let’s start by defining some types we can use as example
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Setting up a typescript project in 2021
Default compiler options · Issue #9642 · microsoft/TypeScript