I am looking to dynamically generate keys by combining the keys of other types, similar to creating object keys dynamically.
type Swatch = {
dark: string;
light: string;
};
type ColorTheme = {
primary: Swatch;
secondary: Swatch;
};
// The desired outcome is
type CombineType: {
// These keys are generated dynamically as a combination of Swatch and ColorTheme keys
// primaryDark: string
// secondaryDark: string
}
To accomplish this task, you can create a "generator" generic type that will provide the desired result.
type First = {
attribute1: string;
attribute2: string;
};
type Second = {
property1: string;
property2: string;
}
type MergeKeys<FK, SK> =
FK extends string ?
SK extends string ?
`${FK}${Capitalize<SK>}`
: never
: never;
type CombineObjects<F,S> = {
[key in MergeKeys<keyof F,keyof S>]: string;
};
type Result = CombineObjects<First, Second>;
The MergeKeys type simply combines the provided key values.
The CombineObjects type is a straightforward generic type that receives two parameters and produces a type where the keys are merged using keyof on both input parameters.
It would be advisable to enhance these types further to ensure only objects can be passed as arguments and to achieve complete type coverage :)
For a functional example, please refer to the code snippet in the Typescript Playground
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