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QUESTION
In tsconfig.json
you can define additional libs, that give you typings for HTML or DOM "libraries"(? I don't know the correct terminology).
I don't understand why dom
and dom.iterable
are separate. Were they defined in different ecma modules/versions? Can I use them safely?
ANSWER
Answered 2022-Mar-17 at 10:09I suspect it's because iteration (iterables and iterators) weren't added to JavaScript until ES2015, long after TypeScript was well-established. When ES2015 was released, the JavaScript engines in many browsers didn't support iteration (yet),¹ and of course at the time Internet Explorer was still a...thing...that was never going to get new features. So some projects had to target environments that didn't have iteration, so the libs are separate.
Even here in 2022, IE survives in corporate and government installations (although thankfully that's finally changing), and some folks have to target their apps and pages to those environments, so they wouldn't want to use dom.iterable
.
¹ ES2015 was the last version of the specification to include significant features that didn't already have implementations in the field. These days, the process that TC39 follows generally doesn't land features in the spec until there are (ideally) a couple of implementations of the feature shipping in the field. Instead, the proposal stays at Stage 3 until that happens, before being moved to Stage 4 by consensus at a TC39 meeting, being added to the editor's draft, and thus being in the next snapshot specification the following June.
QUESTION
After upgrading react-scripts to v5, craco start
does not work properly. App starts with no error but in browser, there is a blank page and if i open inspector, i only see index.html codes not react codes. It was working well with react-scripts@4.0.3. Here is my local files;
package.json
...ANSWER
Answered 2022-Feb-23 at 10:05craco
's Github readme, states that it is supporting Create React App (CRA) 4.*
. By this statement, I'm assuming CRA 5
is not officially supported by craco
.
However, this repository utilizes both CRA 5
and craco
(but I have not verified that it is working). Use this repository to compare your setup (after verifying that the linked repositry is working), and try different settings/configs to see if you get further.
QUESTION
I am using nest.js, prisma, and graphql.
When I run the npm run start:dev command, I get an error.
If anyone knows how to solve this, please let me know.
ERROR [GraphQLModule] Missing "driver" option. In the latest version of "@nestjs/graphql" package (v10) a new required configuration property called "driver" has been introduced. Check out the official documentation for more details on how to migrate (https://docs.nestjs.com/graphql/migration-guide). Example:
GraphQLModule.forRoot({ driver: ApolloDriver, })
...ANSWER
Answered 2022-Feb-19 at 12:36QUESTION
I'm trying to write a TS function which gets a nested value from given object. That object can be one of several types so I'm using generics. However, TS complains so I feel like I'm misunderstanding how generics work in TS:
...ANSWER
Answered 2022-Jan-21 at 12:52You should extend your declaration of generics to the "form" interfaces themselves.
In this case you need to give TypeScript a way to "infer" what the type of the data
property of the form
will be, in order for property
to properly index it.
The way you have it written currently gives an error because you can't use keyof
to extract the properties of a union type. Consider this example:
QUESTION
I want to narrow the type
property of the ValidationErrorItem from Joi
using declaration merging.
The interface in Joi looks like this:
...ANSWER
Answered 2022-Jan-20 at 12:31You can't narrow the type using interface merging. This operation extends types, not overrides them. Extending ValidationErrorItemType
with string
gives ValidationErrorItemType | string
, that's why you still can use any string
.
To achieve this you can redeclare Joi module. Modify the type to your needs and export it after reexporting original Joi typings.
joi.d.ts:
QUESTION
I'm looking for a way to pass on the typings of a parent's constructor parameters into the child's constructor, e.g.
...ANSWER
Answered 2021-Dec-28 at 11:16I think you have to pass as ConstructorParameters[0]
as a constructor param type.
QUESTION
I've been using VS coed for some years now and I loved the experience so far, but one of my most recent projects is suddenly slowdowns the VS code drastically, I couldn't figure out why yet. And amazingly other projects do not give me this headache at the moment, with VS code. So I suspect there's something with the particular project I was mentioned before giving me the trouble. I tried deleting the repo and cloning it again in a new place, uninstalled and installed VS code again, but still no luck. It's really laggy, It takes upto a minute or so to update something I wrote in the editor.
Here's the status report of VS code when the problem occurs
...ANSWER
Answered 2021-Dec-15 at 17:55I have the exact same issue with VSCode and decided to download the latest version of VSCode Insiders (https://code.visualstudio.com/insiders/). They seem to have fixed this issue as the problem is not showing up anymore on any of the affected projects.
You can also sync your VSCode settings with VSCode Insiders (https://code.visualstudio.com/docs/editor/settings-sync) so you can continue to work normally until this issue is fixed in regular VSCode.
QUESTION
I've installed react-router v6 but WebStorm still use react-router v5 types.
In WebStorm folders: /Webstorm2021.2/javascript/typings/...
has loadsh
, react-dom
, react-router-dom
, styled-components
libraries. When I remove those typings folders WebStorm auto creates and downloads those four libraries.
Why does this happens and how to stop this? Or let WebStorm choose the v6 types by default?
...ANSWER
Answered 2021-Nov-22 at 12:27The IDE downloads typings for some popular libraries to its configuration folder and uses it to enhance code completion. You can remove the auto-downloaded typings from your /javascript/typings
(https://www.jetbrains.com/help/webstorm/directories-used-by-the-ide-to-store-settings-caches-plugins-and-logs.html#system-directory) and then either disable typescript.external.type.definitions
Registry key or remove react-router-dom
(and other stuff you don't like to be downloaded automatically) from typescript.external.type.definitions.packages
key
The Registry can be located via: Help > Find action > type Registry...
QUESTION
I have the following array:
...ANSWER
Answered 2021-Nov-04 at 10:29Try this one:
QUESTION
I made a new script in the GAS web editor, and for some reason I decided to add a type notation to the .gs
file:
Of course, there's red squiggly on the type notation, but autocomplete was offering me String
methods when I used text
within helloWorld
.
While hovering over the squiggled text doesn't show anything, clicking the lightbulb adjacent to the line offers me some ts
ignore options:
If I try to save or run the code, I get the following error:
Syntax error: SyntaxError: Unexpected token ':' line: 7 file: Code.ts.gs
I know that typescript can be used in local environments for developing GAS's, but the behavior of the web editor seems to indicate that there may be functionality there. I looked through the docs, and couldn't find anything on this behavior. Though
So, my question: Is this a feature or a bug? If it's a feature, how can I use typings in the web editor? It works great for autocompleting the GAS libraries as well!!
...ANSWER
Answered 2021-Oct-27 at 17:38The Google Apps Script uses JavaScript, this language, per it's specification, hasn't a way to enforce datatypes. What you are seeing in the Google Apps Script web code editor are features taken from Monaco editor some of them might not be fully adapted, anyway you might use JSDoc, more specifically the @param
tag to tell the code editor what datatype belongs to each parameter.
Example:
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