Creating an object with keys that are of a type matching the values in an array (values can be optional and not required)

In my current scenario, I am encountering a situation where I need to assign the keys of an object as values from another array. Here is an example:

const temp: { [key in typeof someArray[number] ]: string[] } = {
   'animal': ['dog', 'cat']
} // However, there is an error stating that some properties from type birds are missing...

const someArray = [ 'animals', 'birds' ] as const;  

This requirement dictates that the temp object must include keys for all the values within the array. The challenge lies in the fact that I want to allow optional values, meaning if a key exists, it should match one of the array values. If there are values that do not correspond to keys, there should be no issues

const temp: { [key in typeof someArray[number] ]: string[] } = {
   'animal': ['dog', 'cat']
} // In this case, there should be no error 

const temp: { [key in typeof someArray[number] ]: string[] } = {
   'animal': ['dog', 'cat'],
   'random': ['random_1']
} // However, this scenario should trigger an error

Answer №1

Change the type of temp to be a Partial:

const temp: Partial<{ [key in typeof someArray[number] ]: string[] }> = {
    'animals': ['dog', 'cat']
}

(by the way, use 'animals' instead of 'animal')

The Partial feature makes every field optional.

I suggest using a type rather than an array:

const temp: Partial<{ [key in SomeArray]: string[] }> = {
    'animals': ['dog', 'cat']
}

type SomeArray = 'animals' | 'birds';

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