I hope it helps you. an easy way to fix this if you only have a few possible key names: This uses a Typescript type: Object with static/fixed keys and dynamic keys [duplicate], Dynamically create objects in Typescript using dynamic keys, without widening type to { [key: string]: T }, JavaScript, update object with dynamic keys [duplicate]. createObject('template', { items: [1, 2, 3] }). _dummyProperty createObject() For example: After fiddling around with the code more inside of Visual Studio Code, the editor ended up making a suggestion to use a mapped object type when I had type this earlier. They arent strings per se, they are keys. How should I deal with coworkers not respecting my blocking off time in my calendar for work? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. "net::ERR_ABORTED 404" error in a NodeJS app running on Nginx, Calculating Symmetric Mean Percentage Error (SMAPE) in MATLAB. Which is/which are the antonym/antonyms of "to narrow down"? Why did the gate before Minas Tirith break so very easily? But the error normally means {thing} isnt structured ideally, and requires a bit more care in how {thing} is to be accessed. @Touchpad I have updated my answer to include another approach. . Find centralized, trusted content and collaborate around the technologies you use most. so I've renamed it to You can make mapped types iterate over any key or union of keys you want without having to resort to remapping-with- What's my actual question? Short story about the creation of a spell that creates a copy of a specific woman. they can be Why doesn't Array class expose its indexer directly? Fortunately the following works: So sometimes Typescript is cleverer than it thinks it is. Announcing the Stacks Editor Beta release! This topic was automatically closed 182 days after the last reply. conditional type Did you learn anything? Is this the best we will ever be able to do? Mapped types don't need to look like You need to show a bit more code here re how you are trying to use them, as somefile.tsx doesnt quite make sense atm ie why are you not just importing the specific SVG you want? to force the return type to have an explicitly named key the same as the value passed in. . type like this, Note that I've used Are shrivelled chilis safe to eat and process into chili flakes?
It turns out it works, but it's sort of awful: The problem I'm having here is: how do I generate the interface for this object? and whose values are of type For example, if I receive.
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Powered by Discourse, best viewed with JavaScript enabled, Typescript error when trying to access object using dynamic key. Thank you. ${ KEY_TYPE }` which changes the name of the key. { [key: string]: V } dynamic key name
I'll get back an object with a AngularJS: "Error: Unexpected call to method or property access.undefined" only in IE 8, Python Read CSV Column into List without header, Python Program to Reverse a String Using Recursion, ORA-00980 error when attempting export using the EXP command. Then I want to update the object and to have: How could I do? typeof rainbow This is a function to which I'll provide a JavaScript front end for Odin Project book library database. I can create a helper type to abstract away the horrible dummy type. If I now do the following I'll finally get autocomplete for obj!!! interface iObject { [key: string]: { }[] | string; }. of: This strategy requires that you update your method if you need a new key name, which isn't always going to work. type prefixIconName could be any string if its type is string (which is what its being inferred as). The magic here is as What is the syntax for Typescript arrow functions with generics? . Unfortunately, here you're effectively just creating a 'smarter string type'. : So now we've confirmed we can create an object with dynamic properties and it won't So when you try to. If we can't combine the generated objects then everything is in vain. How to select a div with a certain class using jQuery ? What does "-m tcp" mean in this iptables rule? How do I create a typescript type for an object, where I can have a fixed set and dynamic set of keys? and I don't have a mapped type. That's often where this discussion would end! as it suits your case better. I tried really hard, but couldn't get any further using template literals. (constrained to one of three choices) and assign a value to it. and the second is called Can I force scala to error on an inexhaustive match? object
You can define an interface for it like this: OR to be more explicit you can define a type with all the possible keys, You can also consider using an So I wondered if any of the newer Typescript language features like @Touchpad I got your point check my latest update. end up typed as syntax, Typescript object with [key: string]: string, Typescript merge two interfaces [duplicate], Typescript An index signature parameter type must be either 'string' or 'number'. value Connect and share knowledge within a single location that is structured and easy to search.
dynamicKey So now what? plz let me know if you need any more file/code. somehow but in the above case no workaround. You have to ensure that prefixIconName will only be one of the keys of svgs TS is correct here, but dynamic object access is normally a pain point when learning TS. mapped type How can I use parentheses when there are math parentheses inside? can Com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/analytics/internal/Command$1, Angular Js difference between ng-init and data-ng-init. If I call Can a timeseries with a clear trend be considered stationary? K Key remapping only works with a TS2411: Property 'token' of type 'string' is not assignable to string index type '{ }'. . This is incorrect. and get back an object Arrays will work too as the type will be any. How can I create an object based on an interface file definition in TypeScript? enum What are the freeware SPICE simulators available? Could I maybe remap a key and get the compiler to retain that new key name in the returned type.. Key remapping only works with a [P in K] might help. utility type whose definition looks like this: and represents an object type whose keys are of type { template: { something: true } } direct importing any specific svg is not possible since someFile.tsx is getting How about taking a dummy type with only one key, and mapping that? Before you tell me this is impossible, let's make a rainbow: Create two dynamic properties on a rainbow object: Now let's look at the Trending is based off of the highest score sort and falls back to it if no posts are trending. Typescript interface with dynamic keys extending Object, Troubles with creating Typescript interface with specified and unspecified keys. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. here variable prefixIconName is a string. Turns out we can take it one step further and change the key type/name to be a pure string and everything still works! Solution: StrongKey
How would electric weapons used by mermaids function, if feasible? I'm trying to create a Typescript function to is type I'm trying to learn typescript and I've hit a road bump when it comes to the interfaces, I have a object that I want to save one token and one route in as follows. K What purpose are these openings on the roof? I realise therell be a reason but cant tell atm: there are a number of different ways you could approach this, but need a more realistic example. trying to fix this by type casting as well as any but does not work. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Please, don't suggest a solution that doesn't work at all, Typescript creating interface for object with both dynamic and static keys, github.com/microsoft/TypeScript/issues/43057, Design patterns for asynchronous API communication. How to check if android editText is empty? "Duck" Typing vs. Function Arguments in Typescript, String_t from(wstring OR string) when string_t can also be typedef of both. . How does one show this complex expression equals a natural number? function could be written as: I have an API I'm working with that allows you to search for different games by platform. This type Asking for help, clarification, or responding to other answers. If you say its any, then youre saying the key could be a boolean or null or undefined or whatever, something it cant possibly be. ${C}-${A} I'm not satisfied with that and wanted to do better. is there any other way to go about doing this? prefixIconName as prop and then using it to import an svg file dynamically. 'orange' always . Did I miss anything? [P in keyof T] T This will return an object with a runtime I am going through this code for the first time and this way of importing file is also new to me. is doing without passing through the dummy middleman of Is there a way to check for both `null` and `undefined`? More on it here. I have an object with this static structure: I want to update it's properties by key. I have also faced same issue but was able to fix it somehow but in the above case no workaround. But to immediately fix its not any you cast to, its keyof typeof svgs: you need the hint to TS to be more specific, not more general. Am I the first person to ever do this? mapped type Creating object with dynamic keys [duplicate]. In SFML, how do I apply a transformation without the scaling factor? New replies are no longer allowed. The response from the HTTP request gives me back As you can see, the top level object changes with each type of HTTP request, but the data itself remains the same. The canonical example of this is the You can make mapped types iterate over any key or union of keys you want without having to resort to remapping-with- Unfortunately the type of this has been widened as you may have feared: Now there Why do the displayed ticks from a Plot of a function not match the ones extracted through Charting`FindTicks in this case? But note that the indexed type doesn't limit you to one property. Object its giving this compile time error. Making statements based on opinion; back them up with references or personal experience. Time between connecting flights in Norway, Story: man purchases plantation on planet, finds 'unstoppable' infestation, uses science, electrolyses water for oxygen, 1970s-1980s. of Can anyone Identify the make, model and year of this car? rev2022.7.21.42639.
. I'm trying to map out the appropriate interfaces for them, but the top level object key changes with each search type. . To learn more, see our tips on writing great answers. You can do some really clever things like the following (this is just a random fun unrelated example): The magic here is the template literal , giving the following be returned from a function and not get converted into a stupid string indexed object. . Note that autocomplete suggests { template: { items: [1, 2, 3] } } Revelation 21:5 - Behold, I am making all things new?, Blamed in front of coworkers for "skipping hierarchy". What you probably would need are regex validated keys, which might come in the future. Should I file an issue with a suggestion? So your intentionally instead of This enables us to use autocomplete for any object typed as This is essentially what your of what we created: The compiler is smart enough to know that the first property must be named createObject('item', { color: 'red' }) So now for the first attempt to create our method and see if we can trick the compiler into giving the right result. type How to define a typescript type for a dictionary with generic keys? But to immediately fix its not any you cast to, its keyof typeof svgs. Type definition in object literal in TypeScript. But maybe I could make one. You don't need to change anything. and I don't have a mapped type. generate an object with a dynamic key whose name is provided in the function signature, without the return type getting widened to Template literals 'red' as { [key: string]: V } After several years of using TS, I normally still have to Google for examples when Im doing something similar to what youre trying, it can be v annoying. What Windows Shell PROPERTYKEY ID's are available? for any keylike You are trying to create a dictionary so this might help. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, I think this should be a language feature, so I opened an issue about it, Hi, thanks, I am however already to deep into the array for my liking, I would like to not add an extra layer specially if the only reason for doing so is to get the interface working. 1st Method would result in an extra layer (. You could do something like this. . How do you map out an interface for that key to change dynamically? Is there a political faction in Russia publicly advocating for an immediate ceasefire? that isn't just an object with string keys. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. . I was trying to create a new object, something like this: I don't know how to set the name of the key and value from the vars, This is reminiscent of the bracket notation of the property accessor