create the shortest function to convert object like this: `{ id: "4", value: "tulum"}` into this: `{ "4": "tulum"}` in typescript

One way to do this is to use reduce() function. Here's an example code:

index.ts
const convertObject = (obj: { id: string; value: string }): { [key: string]: string } => {
  return { [obj.id]: obj.value }
}

const data = { id: "4", value: "tulum" }
const result = convertObject(data)
console.log(result) // Output: { "4": "tulum" }
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In this code, we create a function called convertObject that receives an object with an id and value properties. Inside the function, we use object literal shorthand to create a new object with a key of obj.id and a value of obj.value. Finally, we return the new object.

Then, we create a sample object called data with an id of "4" and value of "tulum". We call the convertObject function with this data object and store the result in a variable called result. Lastly, we log the result variable to the console.

This implementation is very short and simple, but it assumes that the input object will always have an id and value property. If you need to handle different input shapes or handle missing properties, you'll need to modify this implementation.