Is there a way to limit the indexed access type to only return the type of the key specified?
interface User {
id: string,
name: string,
age: number,
token: string | null,
}
interface Updates<Schema> {
set: Partial<Record<keyof Schema, Schema[keyof Schema]>;
}
const test: Updates<User> = {
set: {
name: 1 // Trying to assign number to name should not work
}
}
If you want to make all properties of an existing type optional, you can use the Partial<Type> utility in TypeScript directly:
Check out this TypeScript Playground for a live example
interface User {
id: string;
name: string;
token: string | null;
}
interface Updates<T> {
set: Partial<T>;
}
const test: Updates<User> = {
set: {
name: /* add a value here */,
//^? (property) name?: string
},
};
Your User interface can be easily repurposed
interface User {
id: string,
username: string,
authToken: string | null,
}
interface Changes<Schema> {
update: Partial<Schema>;
}
const exampleChange: Changes<User> = {
update: {
username: null // ERROR: Type 'null' is not compatible with type 'string | undefined'
}
}
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