Partially Typed Deconstructed Object Arguments

Below is the typescript function I have created:

function foo({
  a,
  b,
  c
}:{
  a, //should this line be deleted?
  b, //and this one too?
  c:number
}){
  //omitted code for brevity
}

This particular function implements Destructured Object Parameters. While it defines the type for c:number, it leaves the types of a and b unspecified.

Therefore, my query is: can this function signature be written in a more concise manner by removing those lines and adopting a generic definition instead?

typescript

Answer №1

To ensure proper typing for the c member as a number, you can combine an intersection of a Record<PropertyKey, any> (to represent any object) and { c: number }. This setup allows for destructuring any member while maintaining the type of c.

declare function foo({
  a,
  b,
  c,
//^? (parameter) c: number
  x,
  y,
  z,
}: Record<PropertyKey, any> & { c: number }): void;

Check it out on TypeScript Playground

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