随笔分类 - TypeScript
摘要：Res1: https://www.typescript-training.com/course/making-typescript-stick/08-type-challenges/#returnoff Res2: https://learntypescript.dev/09/l2-conditi
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摘要：`any` type, you can assign any value for any type. For `unkown`, you can also assign any value to unkwon: But you cannot assign unkwon variable to ano
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摘要：const $: any = {} /** * Get the <button> element with the class 'continue' * and change its HTML to 'Next Step...' */ $("button.continue").html("Next
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摘要：Refer: https://www.cnblogs.com/Answer1215/p/15084496.html A string is a primitive value, and all primitive values are immutable. Q1: const a = "Fronte
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摘要：Given this code as starter: export interface DataEntity { id: string } export interface Movie extends DataEntity { director: string } export interface
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摘要：Problem when typing Dictionaries: type Dict<T> = { [K: string]: T } const d: Dict<string[]> = {} d.rhubarb.join(", ") // 💥 Even `d.rhubarb` is undefi
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摘要：Since TypeScript v4.2, we can do remapping by using `as` keyword type Colors = "red" | "green" | "blue" type ColorSelector = { [K in Colors as `select
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摘要：type Statistics = { [K in `${"median" | "mean"}Value`]?: number } Mappiing a sub type: // let winFns: "setInterval" | "setTimeout" type winFns = Extra
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摘要：Main idea is enforce you to do type checking in catch block, because if you want to get Error stacktrace, the throw value should be an Error type, if
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摘要：This major convenience feature reduces the need for class field type annotations by inferring their types from assignments in the constructor. It’s im
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摘要：https://www.typescript-training.com/course/making-typescript-stick/03-recent-updates-to-typescript/#variadic-tuple-types Before V4, for type, it is po
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摘要：export interface TwitterResolverContext { db: Db; dbTweetCache: Record<string, DbTweet>; dbUserCache: Record<string, DbUser>; dbTweetToFavoriteCountMa
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摘要：https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-5.html post.server.ts: export type Post = { slug: string; title: string; }; ex
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摘要：export function assertType<T>(obj: unknown = {}): T { return obj as T } const store = assertType<Store>({select: () => of()})
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摘要：export type Letter = 'a' | 'b' | 'c' type RemoveC<TType> = TType extends 'c' ? never: TType; type WithoutC = RemoveC<Letter>;
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摘要：class SDK { constructor(public loggedInUserId?: string) {} createPost(title: string) { this.assertUserIsLoggedIn(); createPost(this.loggedInUserId, ti
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摘要：Config store app/store.ts import { configureStore } from "@reduxjs/toolkit"; export const store = configureStore({ reducer: {} }); main.tsx import Rea
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摘要：Let's see when we have following code: interface Animal { name: string; } interface Human { firstName: string; lastName: string; } const getDisplayNam
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摘要：type Twitter = { tweets: number} type Instagram = {canFollow: boolean} function describeAccount(account: Twitter | Instagram) { if (account.tweets) {
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摘要：import { json } from "remix"; import path from "path"; import fs from "fs/promises"; import parseFrontMatter from "front-matter"; import invariant fro
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