I have a task that involves configuring a table and creating objects with key-value pairs for each key.
type KeyValuePair<T> = {/** ... */};
let userKeyValuePair :KeyValuePair<{id:number,userName:string}>;
// => {key:'id',value: number} or {key: 'userName', value: string}
userKeyValuePair = {key: 'id' /** with autocomplete */ , value: 'string'}; // will result in an error
userKeyValuePair = {key: 'id' ,value: 687 /** any number */}; // will work correctly
Here's a solution that may fit your needs:
type KeyValuePair<T> = {
[K in keyof T]-?: { key: K, value: T[K] }
}[keyof T];
This code defines a mapped type that generates an object type for each key, such as {a: string, b: number} transforming into
{a: {key: "a", value: string}, b: {key: "b", value: number}}{key: "a", value: string} | {key: "b", value: number}For example:
type Show = KeyValuePair<{ id: number, userName: string }>;
/* type Show = {
key: "id";
value: number;
} | {
key: "userName";
value: string;
} */
You can apply this to your case as well:
let userKeyValuePair: KeyValuePair<{ id: number, userName: string }>;
userKeyValuePair = { key: 'id' /** with autocomplete */, value: 'string' }; // error
userKeyValuePair = { key: 'id', value: 687 /** any number */ }; // okay
Seems to work fine.
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