I need to design a type that includes one mandatory property and allows for any additional properties. For instance, I require all objects to have an _id property of type string.
{_id: "123"} // This will meet the criteria
{a: 1} // This will not work as it lacks the _id field
{_id:"sadad", a:1} // This is acceptable
What approach can I take in typescript to achieve this?
Clearly state that the type should include a key called _id, followed by any object key-value pair Record<string, unknown>
type ObjectType = { _id: string } & Record<string, unknown>;
const a: ObjectType = { _id: "123" }; // This will work
const b: ObjectType = { a: 1 }; // Error: Property '_id' is missing in type
const c: ObjectType = { _id: "sadad", a: 1 }; // This will work
P.S. Check out this reference for Record Key:
What is the Record type in typescript?
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