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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
TypeScript 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 illustrate how tagged un
ãªã‚“ã§ã¿ã‚“ãªRunJS使ã‚ãªã„ã®ã‹ã‚ã‹ã‚‰ãªã„ - Qiita
※タイトルã¯ç…½ã‚Šã§ã™ã€‚ TL;DR RunJSã¯æ‰‹å…ƒã§æ‰‹è»½ã«JSã®æŒ™å‹•ã‚’試ã›ã‚‹ã‚¢ãƒ—リ ã‚ã¡ã‚ƒãã¡ã‚ƒä¾¿åˆ©ã¨æ€ã†ã®ã«ç´¹ä»‹è¨˜äº‹ã‚‚ã‚ã‚“ã¾ãªã„ 使ã£ãŸã‚‰æ—ã‚‹ã‹ã‚‰ã©ã†ãž RunJS Qiitaã§ã‚‚紹介記事見ã‹ã‘ãªã„ã—ã€Googleã§æ¤œç´¢ã‹ã‘ã¦ã‚‚（少ãªãã¨ã‚‚日本語ã®è¨˜äº‹ã¯ï¼‰è¦‹å½“ãŸã‚‰ãªã‹ã£ãŸã®ã§æ›¸ã。 使ã£ãŸã‚‰æ—ã‚‹ã®ã«ãªãƒ¼ã€ã¨ã„ã†ãŠæ°—æŒã¡ã§ã™ã€‚ RunJS is 何？ ç°¡å˜ã«è¨€ã†ã¨ã€JavaScriptã®ã‚µãƒ³ãƒ‰ãƒœãƒƒã‚¯ã‚¹ï¼ˆPlayGround？）。 自分ã®å ´åˆã€ã“ã‚Œã¾ã§ã•ãã£ã¨ã‚³ãƒ¼ãƒ‰è©¦ã—ãŸã„ã¨ãã¯ã€Chromeã®devtoolã§ã‚³ãƒ³ã‚½ãƒ¼ãƒ«ã«æ›¸ãã¨ã‹nodeã®REPL使ã†ã‹ã ã£ãŸã‚“ã§ã™ãŒã€devtoolã¯ãƒ–ラウザ開ã„ã¦ã€devtoolé–‹ã„ã¦ã€ã—ã‹ã‚‚ã‚ã¾ã‚Šæ›¸ãã‚„ã™ã„ã¨ã¯è¨€ãˆãšãƒ»ãƒ»ãƒ»ã€ã ã—ã€nodeã®REPLã¯å˜è¡Œã¨ã‹ãªã‚‰ã„ã„ã‘ã©ã€è¤‡æ•°è¡Œã«æ¸¡ã‚‹ã¨è¾›ã•ã—ã‹ãªã„ã§ã™ã—・・・。 ãã“ã§ãŠå…„ã•ã‚“。 RunJSã§ã™ã‚ˆã€‚ ã¨
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 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 to address concerns such as: theming, styling, internationalization, logg
15K è¡Œã®ã‚¢ãƒ—リを TypeScript 1.8 ã‹ã‚‰ 2.0 ã«ç§»è¡Œã—ã¦ã¿ãŸ - ã¯ã‚„ãプãƒã‚°ãƒ©ãƒ ã«ãªã‚ŠãŸã„
先日 TypeScript ã®æ–°ã—ã„メジャーãƒãƒ¼ã‚¸ãƒ§ãƒ³ 2.0 ã®ã‚³ãƒ³ãƒ‘イラ㮠beta 版ãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚Œã¾ã—ãŸï¼Ž Announcing TypeScript 2.0 Beta What's new in TypeScript コンパイラã®ãƒã‚§ãƒƒã‚¯ã®å¼·åŒ–ã‚„éž null 型，tagged union ãªã©ï¼Œã„ãã¤ã‹ã®æ©Ÿèƒ½ãŒè¿½åŠ ・強化ã•ã‚Œï¼Œè‡ªåˆ†ã®è¶£å‘³ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã§ã‚‚æ©æµã«ä¸Žã‚Œãã†ã ã£ãŸã®ã§è©¦ã—ã«ç§»è¡Œã—ã¦ã¿ã¾ã—ãŸï¼Ž 移行ã—ã¦ã¿ãŸã®ã¯ä¸‹è¨˜ã® Electron ã§ã¤ãã‚Šä¸ã® Twitter Client アプリ（React+Redux）ã§ï¼Œå…¨ä½“ã§å¤§ä½“ 15000 è¡Œãらã„ã§ã™ï¼Ž github.com 下記ã®æ‰‹é †ã§ä¿®æ£ã—ã¦ã¿ã¾ã—ãŸï¼Ž コンパイラをアップデートã—ã¦ãƒ“ルドã—ã¦ã¿ã‚‹ --noImplicitThis，--noUnusedLocals, --noUnusedParameters を有効ã«ã—ã¦ã¿
TypeScriptã€åƒ•ãŒæ‚ªã‹ã£ãŸã€ã‚´ãƒ¡ãƒ³ï¼š nullã‚„undefinedã®æ‰±ã„ã¯ãƒžãƒˆãƒ¢ã ã£ãŸ - 檜山æ£å¹¸ã®ã‚マイラ飼育記 (ã¯ã¦ãªBlog)
TypeScriptã€ãŠå‰ã‚‚ã‹ï¼š nullã‚„undefinedã®æ‰±ã„ãŒã‚¤ã‚¤ã‚«ã‚²ãƒ³éŽãŽ ã”ã‚ã‚“ãªã•ã„。↑ã®è¨˜äº‹ã€åƒ•ãŒã†ã‹ã¤ãªäº‹ã‚’書ãã¾ã—ãŸã€‚TypeScriptã®ã‚³ãƒ³ãƒ‘イラã«ã‚ªãƒ—ションを付ã‘ã‚Œã°ã€nullã¨undefinedã«é–¢ã—ã¦ã‚ãƒãƒ³ã¨ãƒã‚§ãƒƒã‚¯ã—ã¾ã™ã€‚ ãã³ã—ã„ãƒã‚§ãƒƒã‚¯ã‚’ã™ã‚‹ã‚ªãƒ—ション付ããªã‚‰ã€nullåž‹ã‚‚undefined型もシングルトン型ã«ãªã‚Šã¾ã™ã€‚ åž‹ デフォルトã§ã®å€¤ã®é›†åˆ ãã³ã—ããƒã‚§ãƒƒã‚¯ã—ãŸã¨ãã®å€¤ã®é›†åˆ null {null, undefined} {null} undefined {null, undefined} {undefined} void {null, undefined} {undefined} 事ã®ç™ºç«¯ã¨é¡›æœ« TypeScriptã®åˆ—挙型ã®æŒ™å‹•ã‚’知りãŸãã¦ã€enum OnlyOne {ONE} ã®ã‚µãƒ³ãƒ—ルを書ã„ã¦è©¦ã—ãŸã‚‰ã€nullãŒå…¥ã£ã¦ã„ã¦é©šã„ãŸã€ã¨ã„ã†ã®
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 in TypeScript 2.8
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
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