I discovered a tool called pathmirror that transforms objects like:
{a: {b: null} } to {a: {b: 'a.b'}
This is particularly useful for naming Redux actions.
I'm wondering how I can create a type definition for this?
Currently, my declaration looks like this:
declare module "pathmirror" {
export default function<T extends object>(value: T): {[key in keyof T]: object|string};
}
However, the object|string part doesn't account for recursion.
To convert all primitive type fields to strings in an object while maintaining the structure of any object types, you can utilize a recursive type combined with conditional types.
Here is how the types would be defined:
type ConvertToString<T> = {
[K in keyof T]: T[K] extends number | string | null | undefined | boolean ? string : ConvertToString<T[K]>;
};
function transformFieldsToStrings<T extends object>(obj: T): ConvertToString<T>{
return null as any;
};
let result = transformFieldsToStrings({
key1: {
nestedKey: null
}
});
let stringValue = result.key1.nestedKey; // This will now be of type 'string'
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