How to define a type in TypeScript that is a string that can only contain words from a predefined list

I have a tricky TypeScript problem. Let's say I have an icon component with a prop size. Size can be "2", "4", "6". I map these values ​​to a predefined tailwind class. So I enter typeSizeValues='2'|'4'|'6';functionIcon({size='4'}:{size:SizeValues}){constsizeMap={'2':'w...

P粉139351297 2024-01-10 17:24:00 0  1  457

Assert that a type is not branded

If we define a type brand like: declareconstnominalSymbol:uniquesymbol;typeNominal=U&{[nominalSymbol]:T}; is there a way to define a type NotNominal that resolves to U if U is not a brand type. declareconstnominalSymbol:uniquesymbol;typeNominal=U&{[nomi

P粉323224129 2023-08-18 11:51:11 0  1  498

android - java generics do not support arrays, so is there any convenient way for RxJava's Map collection to define and obtain a string of common parent class collection data?

I used just to send the obtained data (json), and then processed the obtained data through map, converted it into a map, and then subscribed. In the actual process, I found that there were many similar operations, so I wanted to encapsulate them. , I want to use generics to specify the target collec...

PHP中文网 2017-05-16 13:33:04 0  1  655

Translation: React - TypeScript destructuring assignment of props

I have a function: export function getSubjectsForStudent(data: any): any[]. The "data" parameter is what I receive from an external source and defining a strong type is not feasible. "return" is derived from "data", so it is also of type any. A "Main" componen...

P粉071602406 2023-07-27 16:35:13 0  2  460

Python - Return a new instance of itself through a class method

Define a class A and have a method with its own ID + 1. The code is as follows: {code...} Define instance x as class A with an id of 1 and print x.id: {code...} Now I want to create An instance y, which is also a class A, is created through the newid method of class A: {code...} You can get the accu...

漂亮男人 2017-05-18 10:53:17 0  2  606

c++ - Problem with input stream object cin discarding untyped characters

The question requires writing a while loop statement. Each loop reads two ints and pushes them into the vector. When '|' is entered, the program ends. The problem now is that the question requires the input of two different types of characters {code... } The above program is a solution I can think o...

仅有的幸福 2017-06-27 09:19:12 0  1  985

Typescript error occurs when assigning VITE_API_URL in baseURL of axios

I have a very basic axios setup on a Vue3 application built on Vite and Typescript. However, I get a typescript error for 'baseURL' which reads: Input 'string|'boolean|undefined' is not assignable to type 'string|undefined'. Type 'false' is not assignable to type 'string|' undefined'.ts (2322) As ex...

P粉014218124 2024-03-19 16:45:32 0  1  468

This is a big php programming question. I have no choice. Please help.

Define a parent class Person (person), including two attribute members xm (name) and xb (gender) and a constructor. xm and xb cannot be read and written directly in the main program. The name and gender are initialized in the constructor. . Define a subclass teacher (teacher) inherited from Person, ...

有为鱼 2019-01-08 15:02:44 0  3  1086

java - Regarding the issue of class guidance in IDEA, I would like to ask all the experts for help! Still looking forward to an answer! grateful!

Suppose I have a class called AAA in the cn.xxxx.xxxxx.domain package, which has various methods, and then define another class in the cn.xxxx.xxxxx.net package. This class needs to call the methods in the AAA class in the cn.xxxx.xxxxx.domain package. . Is there a setting that allows the idea to...

phpcn_u1582 2017-05-17 10:07:54 0  2  447

Why can't I pass type information when drilling into props when using React and TypeScript?

I'm a long time React user but currently trying to learn Typescript. In React, when you need to pass props down several levels, why don't the types defined by the top-level parent component remain in the props? It seems frustrating to have to redefine types on the parent component and all child comp...

P粉776412597 2023-09-14 17:35:21 0  1  497

How to specify custom column types in Prisma?

Prisma does not currently support geospatial columns. I need to add a column of type MySQLGEOMETRY to my database. I could write a custom migration, but the whole purpose of Prisma is to manage my migrations. How to specify custom column types in Prisma schema files? Can be MySQL specific.

P粉604848588 2023-08-18 10:18:26 0  1  499

Can Python subclasses override global functions?

For example, there is a class A in a.py. A has several methods. These methods all call a global function hello() (defined outside the class, but also in a.py). Suppose I want to write a subclass B , but I want B to call a newly defined hello(), is this possible? {code...} {code...

曾经蜡笔没有小新 2017-05-18 10:46:14 0  2  487

The output method of defining type functions based on conditions in TypeScript

I'm trying to define an output type for my function, I want to set a condition between string and number types based on the toNumberIfNeeded flag, assuming that if toNumberIfNeeded is true, this function will return a number type, otherwise it will return a string type. What should I do? interfaceOp...

P粉764836448 2023-08-14 18:18:08 0  1  519

View-Simple data binding-Can array types be bound?

View-Simple data binding-Can array types be bound? Binding variables can directly access numbers. Can this change be merged into an array for binding?

A大奇 2019-09-29 20:48:09 0  0  1077

Ways to resolve Quasar vuelidate error message type error

I'm using "vuelidate" to validate Quasar framework. When I write the code below, a type error occurs. (Property) Error Message: String|Reference number input 'string|'Ref' is not assignable to type 'string|'undefined'. I think the "error-message" attribute is undefined before the...

P粉046387133 2024-01-08 11:59:36 0  1  493

"WordPress's has_term() function does not work as expected"

I have a custom post taxonomy defined as follows: //Register a custom taxonomy for posts functioncustom_taxonomy_page_type_for_posts(){$labels=array('name'=>_x('Page Type','Taxonomy Common Name') ,'singular_name'=>_x('Page type','Taxonomy singular name'),...$args=array('hierarchical'=>f

P粉248602298 2023-09-06 15:59:22 0  1  501

Make React props optional and required in TypeScript based on other props

I have a React button container component that returns a regular button, an icon button, or an icon-only button based on the type provided by the prop used by the user. The following are the related type definitions of ButtonContainer components and Props: typeButtonWrapperProp={label?:string;icon?:...

P粉738046172 2023-09-17 13:42:00 0  1  651

python - pymysql reports error 1146 The xls table failed to import into the database. I don't know where the problem lies.

Python 4.3.0 defines a class to operate the local database, and then defines two functions to import the corresponding two tables. The strange thing is that the first function input_HA() can be used and the form is imported successfully, but the second input_ImpactList() does not work. Can anyone he...

漂亮男人 2017-05-18 10:55:11 0  1  1173

Is it possible that .shift() returns undefined?

I'm writing a TypeScript function and my IDE tells me that the result of .shift() may be undefined, which results in more type warnings... Here's the code: functionaccumulateProofs(proofs:Proof[], requiredAmount:Number,strategy:'middle'|'ascending'|'descending',):Proof[]{constresult:Proo

P粉461599845 2024-02-03 19:55:25 0  1  348

Adding types to your Vite library build: a step-by-step guide

I used the library pattern as per the vite documentation and was able to generate a working component library. I created project using vue-ts preset and defined props and their types in my component and used some interfaces. But when I build the library, no types are included. How do I add types to ...

P粉426780515 2024-01-21 15:57:45 0  2  601