随笔分类 - TypeScript
摘要：Traversing items of custom data structures, like trees or linked lists, require knowledge of how that data structure is built. That can lead to proble
阅读全文
摘要：Unlike JavaScript's const variable declarations, TypeScript allows you to create fully immutable types. In this lesson, we learn how to create immutab
阅读全文
摘要：There might be cases where you have selective data for your entities. Let's say that you are building a public API endpoint to get all the registered
阅读全文
摘要：In this post, let's see how to make all the optional fields to be required with the help of Required. type User = { name: string; age?: number; gender
阅读全文
摘要：There might be cases where you would want to create a type while excluding some of the properties from a type. Let's say you have a database query on
阅读全文
摘要：For example, we have a interface: We are using it with NestJS backend, in order to validate the request with meanful runtime error message, we can use
阅读全文
摘要：In general, it is not recommeded to use Namespace in Typescript, we should use ES6 module export import syntax. But there are still some good usecases
阅读全文
摘要：TypeScript 2.8 adds the ability for a mapped type to either add or remove a particular modifier. Specifically, a readonly or ? property modifier in a
阅读全文
摘要：The postshows you how to use the null coalescing operator (??) instead of logical or (||) to set default values in TypeScript 3.7 to prevent expected
阅读全文
摘要：TypeScript 3.7 adds support for optional chaining. This lesson shows you how to use it in your code to handle properties that can be null or undefined
阅读全文
摘要：Take away from NGCONF talk. It is a good show case to how to use decorator. One take away is that we can use 'symbol' to uqine key.
阅读全文
摘要：Here we refactor a React TypeScript class component to a function component with a useState hook and discuss how props and state types can be modeled
阅读全文
摘要：Because @types/react has to expose all its internal types, there can be a lot of confusion over how to type specific patterns, particularly around hig
阅读全文
摘要：For example you are building your own module, the same as Lodash: my-lodash.d.ts Normally you can install @types for popluar 3rd-party libs, if you ha
阅读全文
摘要：The DOM can be a bit tricky when it comes to typing. You never really know exactly what you're going to get, so you have to educate your codebase into
阅读全文
摘要：TypeScript can help you with your plain JavaScript files if you add a simple //@ts-check comment. Then you can enhance the experience by add proper JS
阅读全文
摘要：TO get started with TypeScirpt quickly in your local computer is using parcel-bunlder: Create a index.html: Create a index.ts, put whatever you want.
阅读全文
摘要：Decorators are a powerful feature of TypeScript that allow for efficient and readable abstractions when used correctly. In this lesson we will look at
阅读全文
摘要：We will look at how we can use mapped types, conditional types, self-referencing types and the “infer” keyword to create a reusable generic type that
阅读全文
摘要：When working with conditionals types, within the “extends” expression, we can use the “infer” keyword to either get the type of the elements of an arr
阅读全文
浙公网安备 33010602011771号