express-ts | Tutorial on creating an Express app using Typescript | Runtime Evironment library
kandi X-RAY | express-ts Summary
kandi X-RAY | express-ts Summary
In this article we will set up an Express application using Typescript.
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express-ts Examples and Code Snippets
Lines of Code : 21License : Permissive (MIT License)
Copyprivate static long makeChange(int[] coins, int money, int index, HashMap memo) {
if (money == 0)
return 1;
if (index >= coins.length)
return 0;
String key = money + "-" + index;
if (memo.containsKey(key)) {
return memo.get(key); Community Discussions
Trending Discussions on express-ts
QUESTION
The documentation stresses that I should use a new EntityManager for each request and there's even a middleware for automatically generating it or alternatively I can use em.fork(). So far so good.
The EntityRepository is a great way to make the code readable. I could not find anything in the documentation about how they relate to EntityManager instances. The express-ts-example-app example uses single instances of repositories and the RequestContext middleware. This suggests that there is some under-the-hood magic that finds the correct EntityManager instances at least with the RequestContext. Is it really so?
Also, if I fork the EM manually can it still find the right one? Consider the following example:
...ANSWER
Answered 2021-Mar-25 at 11:14First of all, repository is just a thin layer on top of EM (an extension point if you want), that bares the entity name so you don't have to pass it to the first parameter of EM method (e.g. em.find(Ent, ...) vs repo.find(...).
Then the contexts - you need a dedicated context for each request, so it has its own identity map. If you use RequestContext helper, the context is created and saved via domain API. Thanks to this, all the methods that are executed inside the domain handler will use the right instance automatically - this happens in the em.getContext() method, that first checks the RequestContext helper.
https://mikro-orm.io/docs/identity-map/#requestcontext-helper-for-di-containers
Check the tests for better understanding of how it works:
https://github.com/mikro-orm/mikro-orm/blob/master/tests/RequestContext.test.ts
So if you use repositories, with RequestContext helper it will work just fine as the singleton repository instance will use the singleton EM instance that will then use the right request based instance via em.getContext() where approapriate.
But if you use manual forking instead, you are responsible use the right repository instance - each EM fork will have its own one. So in this case you can't use a singleton, you need to do forkedEm.getRepository(Ent).
Btw alternatively you can also use AsyncLocalStorage which is faster (and not deprecated), if you are on node 12+. The RequestContext helper implementation will use ALS in v5, as node 12+ will be requried.
https://mikro-orm.io/docs/async-local-storage
Another thing you could do is to use the RequestContext helper manually instead of via middlewares - something like the following:
QUESTION
I am trying to use typescript paths functionality so that I don't need to use relative imports anymore.
Here is my tsconfig.json
...ANSWER
Answered 2019-Oct-08 at 11:08Note: for a working example with nodemon, skip to the second section of my answer.
If you mean that once you compiled the files and run the application, the modules are not found, then have a look at this thread: Module path maps are not resolved in emitted code
"paths" is designed for use with loaders that allow remapping
Say I have this path in my tsconfig.json:
QUESTION
I asked a question about JS Promises in this post:
I'm doing Promises wrong... What am I missing here?
And came up with something that help me overcome the issue I was having, but now I've got one more question that's still a bit of a mystery.
In the updated code I have:
login.ts:
...ANSWER
Answered 2017-Jan-24 at 19:42Your problem is that you missed to return the Promise.reject(…)s from your callbacks. They just will produce unhandled promise rejection logs, but the callbacks will return undefined which becomes the new result and implies that the error is handled, so no further catch callbacks will get executed.
However, that code should be simplified a lot anyway. Regarding the closing of the database connection, you should have a look at the disposer pattern or a finally method.
QUESTION
I have a file token.ts that exports 1 function:
...ANSWER
Answered 2017-Jan-22 at 19:00As far as I can see, the issue that you are experiencing is that the token is generated in an async manner while you are trying to read it in a sync way.
Your genToken method should return a Promise and you should send your request once that promise is resolved. Something like:
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