With reference to my code below, I am trying to create a Map<string, Function> (eventHandlerMap in the code below) such that each of its keys is a string from (PortalEvent in the code below) Union type. The value of each property should be a function that must return an object of specific type (in this example one of UserComment or Author).

I have a number of classes that I’ll need to create instances of based on a string. Each class has a model that needs to be passed in their constructor and they are all different (some similar properties, but we’ll keep it simple).

I have the following KeyMapper type that I need to fix:

I have a function that takes as parameters a method name as a string and the object that contains that method. I can easily check that the class of the object contains the method name. But I also want to make sure that it is callable and the return type is of a certain type. How can I do that?

I have a sanitizer that may or may not receive a set of possible values. If it receives, it should enforce those to be the only possible values, if not, it should just check if it is string type, and if any of the checks failed, I want to return defaultValue. My code so far is the following:

I am trying to create a version of Array.groupBy() that handles more cases.
Specifically, I want to be able to store a single object for a given key (instead of an array of objects with Array.groupBy()) or pluck a single property from each object.

i am a free programmer and recently learning about Typescript, more specifically i am experimenting with writing some code to get the value/typeof of any value inside a json object based on the path string, supporting correct pathing. Here is mine

I’ve been trying to get these types working for a while now. Don’t worry about the implementation. I only want to fix the types. The function takes and reduces over the config array using the fn property. Each config item should have the aggregated return type from the previous steps passed the fn function. The types work, but the autocomplete in the editor is broken when I create a new object in the array, TS Server thinks it’s an array type. Can this be fixed?

I’ve been trying to get these types working for a while now. Don’t worry about the implementation. I only want to fix the types. The function takes and reduces over the config array using the fn property. Each config item should have the aggregated return type from the previous steps passed the fn function. The types work, but the autocomplete in the editor is broken when I create a new object in the array, TS Server thinks it’s an array type. Can this be fixed?

I am a fan of script languages and was using javascript for long time. But for a new project I decided to see how ts may help my development or maintaining part of the project. My biggest problem atm is finding types. Let me give an example. I am using drizzle for orm. For some reason I need to store the findMany query config. To be more clear I am pasting the whole type of the findMany function and class here.