Consider this simple scenario:
type Alpha = {
children: any;
size?: string;
};
type Beta = Omit<Alpha, 'children'>;
// I understand the type of Beta.
type Gamma = {
[x: string]: any;
children: any;
size?: string;
};
type Delta = Omit<Gamma, 'children'>;
// Why does Z lose the type of `size`?
(Test it out on this playground.)
Could this be a mistake?
Upon hovering over Exclude<Y, 'children'>, you will find the corresponding definition.
https://i.sstatic.net/12AbCdE.png
The concept here is that each key in your object is treated independently of its associated type. With a generic index ([x: string]) being used, keys are merged during keyof since size falls under [x: string].
Incorporating insights from your playground in this link, it appears to be more of a subtle challenge than a bug.
To tackle this issue, consider defining types as follows:
type A = {
children: any;
size?: string;
};
type Solution = { [x: string]: any } & Omit<A, 'children'>
const obj: Solution = {};
obj.size;
// The type of obj.size will be either string or undefined
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