Questions tagged [ecmascript-next]
For questions about upcoming ECMAScript features that are not scheduled to be part of a specific version yet (anything that is a stage 3 or lower proposal).
ecmascript-next
407
questions
0
votes
0
answers
16
views
On running Nest & Typescript API, module cannot be found unless extension explicitly changed to .js
I am working on a personal project to try to get a new dev role. I am using NestJS and Typescript to try to make a simple API (will later hook up some endpoints to a website, just want to show some ...
- 31
0
votes
2
answers
57
views
Can I have identiers looked up first as members of this, and then as globals?
I write JS (well, EcmaScript), but only relatively rarely.
When writing on a member function for an object, I naturally often use other member variables and functions multiple times; but I tend to ...
- 127k
-3
votes
3
answers
184
views
Is there a way to enable a modern "this" scope in a JS module and remove the need for the "this." prefix?
I have the following module class and to make it work similar to non module functional javascript, I have to call a function to bind all the class member functions to the correct this scope and I have ...
- 17.2k
1
vote
0
answers
73
views
Use Array.prototype.with in react-native project
I'd like to use Ecmascript 2023 array methods like Array.prototype.with in a react-native project. Are these supported at all, and if so, how can I enable the transformation of those?
I am on the ...
- 2,401
0
votes
1
answer
134
views
UnhandledPromiseRejection while OGM initialize on Neo4j GraphQL Express Server
I am using express with Neo4j graphql.
Seeing this exception without specific line indications in my code.
node:internal/process/promises:289
triggerUncaughtException(err, true /* ...
- 483
0
votes
0
answers
59
views
TypeScript 5 - Apply a decorator programatically
Is there a way to apply a decorator programmatically in TypeScript 5? It could be useful to create a decorator function that applies multiple decorators.
Previously it was relatively straightforward ...
- 8,215
4
votes
1
answer
549
views
TypeScript 5 - Access class constructor from a property decorator
In TypeScript 5 the property decorator's type definition has changed and there does not seem to be a way to get a class's constructor.
It now implements the TC39 proposal where the first parameter to ...
- 8,215
13
votes
2
answers
6k
views
Why is my regex valid with the RegExp u flag, but not with the v flag and does not work in HTML pattern attribute?
I am getting the below console warning for this regex pattern:
^[a-zA-Z0-9+_.-]+@[a-zA-Z0-9]+\\.[a-zA-Z0-9]+$
Pattern attribute value ^[a-zA-Z0-9+_.-]+@[a-zA-Z0-9]+\.[a-zA-Z0-9]+$ is valid with the ...
- 159
1
vote
2
answers
582
views
Typescript exclude methods from class once invoked
I have a use case where I want to exclude methods from return type of class method once they are invoked. ie, let us assume I have a class Setup having method step1, step2 and step3.
class Setup {
...
- 1,819
5
votes
1
answer
3k
views
Need explanation of error message 'TypeError: Receiver must be an instance of class' [duplicate]
When I run this code:
'use strict';
class Base {
constructor() {
this._public();
}
}
class Child extends Base {
constructor() {
super();
}
_public() {
this.#privateMethod();
...
- 4,406
0
votes
1
answer
751
views
sam build outpus cjs file instead of mjs file
When I wanna build my lambda project by using sam cli, it gives me error like below. I use typescript and ES2022 and wait that it should outputs mjs files. But it outputs cjs files. So, cjs files don'...
- 1,345
3
votes
3
answers
214
views
How to convert Generator method to an Iterator
I have this recursive generator method which yields the values of a BST in ascending order:
*inOrder(node){
if (node === null) {
return;
}
if(node.left){
yield * this....
- 97.4k
0
votes
1
answer
498
views
Copy properties but not function properties, using spread operator or similar
Is there a way in JS to copy all non-function properties using the spread operator or the like? this won't do it obviously (since it will copy function references):
getSerializableData(): Partial<...
- 97.4k
0
votes
1
answer
345
views
Can async / await always be automatically replaced by Promises chains?
Usually, Promises chains can be rewritten using async/await
const f = () => Promise.resolve(1).then(a => a+1)
can be translated to
const f = async () => {
const a = await ...
- 5,448
3
votes
1
answer
292
views
Does ECMAScript Regular Expressions match its syntax characters?
I'm referring to ECMAScript regular expression syntax defined in https://tc39.es/ecma262/#sec-regexp-regular-expression-objects.
I checked how the following pattern matches in a regular expression via ...
- 53