es6 | ECMAScript 2016 语言规范 中文版 | Parser library
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kandi X-RAY | es6 Summary
ECMAScript 2016 语言规范 中文版.
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QUESTION
I have a project with E2E tests setup with Playwright + TS-Jest. To organize my tests I use Page Object Model. Structure looks like that:
I wanted to use TypeScript paths
option in tsconfig.json
to clean up the imports both in test files as well as in POM classes. After some trial and error I came up with the following config files:
ANSWER
Answered 2021-Jun-14 at 15:04I've managed to find solution in this GitHub issue: https://github.com/kulshekhar/ts-jest/issues/1107#issuecomment-559759395
In short, by default ts-jest
transform is invoked later than it should, so doesn't have a chance to process all the files. The tsconfig-paths
can help with that:
- Install above package with
yarn add --dev tsconfig-paths
- In
global-setup
file addrequire('tsconfig-paths/register');
at the very beginning of the file.
All the absolute imports should work.
QUESTION
What would be a shorthand for the following:
...ANSWER
Answered 2021-Jun-14 at 13:54I'm assuming that you are looking for the least-verbose way of doing this.
Most likely this would be achieved by using Object.assign
:
The Object.assign() method copies all enumerable own properties from one or more source objects to a target object.
in your case, the target object is element
and the only source object here would be config
:
QUESTION
I built a hook for the toString
method using ES6 Proxy. While debugging some issues I noticed the console.log
of handler getting called for no reason.
ANSWER
Answered 2021-Jun-14 at 07:24Inside the handler, you call console.log(target, thisArg, args);
where target
and thisArg
are functions. The devtools console appears to use .toString()
to get the name of the function to display it.
QUESTION
I want to mock a module for a test. Everything works, but I have to copy/paste the same code into every test file. How can I make this more maintainable?
(This is using Babel and TypeScript in a Next.js project.)
The production code looks like this:
...ANSWER
Answered 2021-Jun-10 at 15:37Maybe using the __mock__
directory can help you.
from the docs:
Manual mocks are defined by writing a module in a mocks/ subdirectory immediately adjacent to the module. For example, to mock a module called user in the models directory, create a file called user.js and put it in the models/mocks directory.
You can also mock modules from the node_modules
directory.
QUESTION
As far as I know, the v8 engine is based on ECMAScript language specifications, do you develop it with a new ECMAScript whenever a new ECMAScript is released?
Or do we add only the newly added functions?
For example, if you look at ES5 -> ES6, in the case of Execution Context, the components change, but do you change all of them?
...ANSWER
Answered 2021-Jun-10 at 09:51(V8 developer here.)
Both the ECMAScript standard itself and engines' implementations of it evolve by adding individual features one by one.
The "TC39" committee discusses new proposed features. Once a feature has been agreed upon, it is added to the standard (see the "Process" document @Bergi linked in his comment for more details). The yearly "releases" of ECMAScript are just snapshots of this continuous process.
Engines typically implement a new feature either shortly before it is finalized (so that implementation feedback can inform the standardization discussion) or shortly after.
Rewriting an entire JavaScript engine from scratch every year would be a huge waste of effort: most of the language doesn't change. Also, rewriting an entire JavaScript engine from scratch would take many years. (In fact, rewriting any software from scratch is almost always a bad idea, because you'll spend a huge amount of time just catching up with what the old version was able to do. Incremental improvements are almost always the better strategy.)
The majority of engine developers' time is typically spent on improving support for existing features and subsystems (compilers, garbage collectors, internal object model, ...), such as making them faster or more memory efficient.
QUESTION
I have this Codepen demonstrating how to do it with jQuery. I tried to do it with vanilla Javascript but couldn't get it to work. How would you go about this in plain ES6?
HTML:
...ANSWER
Answered 2021-Jun-09 at 16:29You can just do document.querySelectorAll('.external a').forEach
to iterate over all of them:
QUESTION
I am currently writing a REST API with Express and Typescript but I am having trouble extending the Request/Response of Express.
My IDE does not complain anymore, but Typescript throws TS2339 Errors when compiling with error TS2339: Property 'jsonStatusError' does not exist on type 'Response>'.
I have a jsonResponseMiddleware
ANSWER
Answered 2021-Jun-09 at 11:57This attempt works for me.
Add a file named global.ts
in your source folder:
QUESTION
I'm a JavaScript beginner. I do not use a "bundler".
For a few days now I've been trying to use moment.js and other date-time libraries in some JavaScript by importing it using ES6 modules (ESM).
I have a JS module I wrote, which is transpiled from TS, and that has this line:
...ANSWER
Answered 2021-Jun-08 at 17:47You want to import a bundled version of the lib to be able to do that. Try:
QUESTION
I just recently discovered the "Set" data type in ES6. Love it so far. I am working on a Autoselect which consists of multiple options, but I don't want to show duplicates. Thats why I use the Set-Datatype.
For example:
I have this array of uploads:
...ANSWER
Answered 2021-Jun-08 at 07:35QUESTION
I have a vaadin14 application that I want to enable different types of authentication mechanisms on different url paths. One is a test url, where authentication should use DB, and the other is the production url that uses keycloak.
I was able to get each authentication mechanism to work separately, but once I try to put both, I get unexpected results.
In both cases, I get login page, but the authentication doesn't work correctly. Here's my security configuration, what am I doing wrong?
...ANSWER
Answered 2021-Jun-06 at 08:12Navigating within a Vaadin UI will change the URL in your browser, but it will not necessarily create a browser request to that exact URL, effectively bypassing the access control defined by Spring security for that URL. As such, Vaadin is really not suited for the request URL-based security approach that Spring provides. For this issue alone you could take a look at my add-on Spring Boot Security for Vaadin which I specifically created to close the gap between Spring security and Vaadin.
But while creating two distinct Spring security contexts based on the URL is fairly easy, this - for the same reason - will not work well or at all with Vaadin. And that's something even my add-on couldn't help with.
Update: As combining both security contexts is an option for you, I can offer the following solution (using my add-on): Starting from the Keycloak example, you would have to do the following:
- Change
WebSecurityConfig
to also add your DB-basedAuthenticationProvider
. Adding yourUserDetailsService
should still be enough. Make sure to give every user a suitable role. - You have to remove this line from
application.properties
:codecamp.vaadin.security.standard-auth.enabled = false
This will re-enable the standard login without Keycloak via a Vaadin view. - Adapt the
KeycloakRouteAccessDeniedHandler
to ignore all test views that shouldn't be protected by Keycloak.
I already prepared all this in Gitlab repo and removed everything not important for the main point of this solution. See the individual commits and their diffs to also help focus in on the important bits.
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