Questions tagged [typescript]
TypeScript is a typed superset of JavaScript that transpiles to plain JavaScript. It adds optional types to JavaScript. This tag is for questions specific to TypeScript. It is not used for general JavaScript questions.
typescript
232,739
questions
0
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1
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7
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Wait for a response before loading template
I have an angular application that makes a server call on ngOnInit() and returns a result. I then use the result to populate a model in my template. My template is loading before the call is finished, ...
- 1,765
0
votes
0
answers
15
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Creating a type from an object's keys and values in TypeScript
I'm trying to create a new type based on the type of a statically defined object in TypeScript. Given the following map:
const map = {
'hello': {a: 1, b: false},
'world': {b: 'hello', c: null}
...
- 96
-1
votes
0
answers
30
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Why does Typescript only widen the return type from a Promise.catch() but not from a synchronous catch?
Steps to reproduce:
Define a function that returns a promise of string or false.
Call and return an async function and return false from the catch method.
Problem:
Typescript claims it doesn't match ...
- 3,212
0
votes
0
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10
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Vue3 Typescript Sum all values of a column in an array
I'm still very new to this programming language and I'm trying to take an array column and sum its values so I can show a total amount on the webpage.
Question #1
I was attempting to use a computed ...
0
votes
1
answer
18
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class validator required if
I have this class
class A {
@IsString()
@MaxLength(99)
prop1: string
@IsBoolean()
prop2: boolean
}
I want it to be:
string.
required (if prop2 is true).
optional if prop2 is false.
In ...
- 2,920
2
votes
1
answer
33
views
Remove the `length` property from a callable type
Assume I have the following type:
export type Foo<T> = (() => T)
Is it possible to remove the length property from it while keep it callable ?
Also, using Omit, Omit<(() => T), 'length'...
- 48.1k
0
votes
0
answers
5
views
Setting up Tone.js on button click still fails with : The AudioContext was not allowed to start
I have a angular component that has a button to start an animation and at the same time play some notes each time a number is highlighted
I'm setting up tone.js synth when the button is pressed see ...
0
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0
answers
18
views
A strange behavior when checking `extends ReadonlyArray<any>`
See code:
https://www.typescriptlang.org/play/?#code/...
- 1,310
0
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0
answers
16
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How to write a test against randomly selected values from a collection?
I have a function which selects a random value from an array to be returned:
export function selectMovieUnderDuration(options: IStreamRequest, movies: Movie[], prevMovies: Movie[], duration: number): ...
- 789
0
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0
answers
13
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Simple sticky scroll effect causes glitch on mobile browsers
I wanted to use a scroll effect (parallax + filters) in a very simple page. It's just a sticky 120vh div with a background image and some text.
Everything works fine in the desktop browser and with ...
- 8,656
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10
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Cypress. How to pass the same data to "it" functions within one "describe" function
I am testing 2 products. 1 for users and 1 for employees. The user creates a request and then it is processed by the employee. I generate an object with random test data. Based on this data, I create ...
- 39
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1
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19
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export default new TypeScript Expected 1 arguments, but got 0.ts(2554) how to fix?
Doing a QA job with PlayWright and TypeScript
Trying to avoid extra imports like defaultPage = new defaultPage(page); in spec files just to reduce lines of code and make tests little more pretty.
new ...
0
votes
1
answer
8
views
How to build a Vue web component which reflects an internal state as an attribute?
I am building a web component input which looks like this with Vue 3:
<my-input value="Search"></my-input>
How can I make sure that the value attribute is always equivalent to ...
- 19.9k
-1
votes
1
answer
26
views
Generate object access keys from props
I have problems with dynamisation in Typescript. I know that TS works statically. However, there are sometimes situations where I want to access an object dynamically and cannot do this directly via ...
- 11
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8
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error NG8001: 'mytable' is not a known element
When I try to compile the front-end of my project, the following error occurs in the userList.html file. Actually, the error occurs in any HTML file located in the ./page folder, but I will use ...
