Change return type based on value of parameters

I'm trying to change the return type of a function based on the value of the arguments passed to the function itself. I'm struggling to find the right documentation for it, could anyone point me in the right direction

Here's an example of what I want:

function doSomething({user, includePfp}){
if(includePfp) return {...user, pfp: 'wow'}
return user
}

doSomething({user}) // returns type of User
doSomething({user, includePfp: true}) // returns type of User & {pfp: string}

function doSomething({user, includePfp}){
if(includePfp) return {...user, pfp: 'wow'}
return user
}

doSomething({user}) // returns type of User
doSomething({user, includePfp: true}) // returns type of User & {pfp: string}

function doSomething({user, includePfp}){
if(includePfp) return {...user, pfp: 'wow'}
return user
}

doSomething({user}) // returns type of User
doSomething({user, includePfp: true}) // returns type of User & {pfp: string}

function doSomething({user, includePfp}){
if(includePfp) return {...user, pfp: 'wow'}
return user
}

doSomething({user}) // returns type of User
doSomething({user, includePfp: true}) // returns type of User & {pfp: string}

Solution

Here is the final solution in case anyone is curious
https://www.typescriptlang.org/play?#code/JYWwDg9gTgLgBAbzgUygYwEwAYCCAhASQBo4BXAZ2TwEMAbagOzWRIuQGEIGYpq0YASsmoATVpU7de-IaPJwAvnABmUCCDgAiAO7UA5iGCaA3AFgAUBZgBPMMjg1KAUQHtsABWq8Q8gLyILODgYCABrZAYcEREoZHJyAC44AAMsAA8AEgRyHmAGPQVkwLg0AAtqPIIRJIZSEAAjVDNzIJBkGFFqDoB+JPqICFphBmagtihelPSsnKg8guTRlAZqeqGRSf7B4aXdGDLNgaHGJeowMDUAN2RD7ZPi8jsGEVRJ1Mzs3PzCuAAfMmeyGUeWQImaCmaVls9hw5yuyBcbiwnm85AAPAAVRz2ZBpGARETybGIjxeag+AB8cH8CAeTxeUCSWOolAA2pozhcINdNABdFB4gnyZR0Sh-AEvYEMUHi2q0WjFboSoEgkTFJLvGZfBanOHc5A4EAQUjcJnY9mc+F8gX457C0X2f4myWq2WkeWK5VS0HquD1YB6PIwJa4vgwWFcy50SbMtkcvU8-m422ElQO8XOlXSkRuj0tOBKzPetX5vpHHYWCEWCwAehrwWhcAAqs5XKTUdSHCyEW3kWSfHAAGRwCPwkl91Fo4m9lHk8gU5o2OzN1tI2cD-zTtf98iQ8xL+zjgCy7U6HU7tPzKzaSVm8yW5GsDUGt+1SxeaFAopqdUaUCWIQdLQADKpDnLQ1h9AGQbgnuB4rj2SJCOQ7rwDSxRtB0IhdNQkzHqe2EdEs9R0IwzCbNB3CwdW+6NuOyGoSeWE4Z27jAGgoRoi2iHYAxtAwCQmiYWe1CaAuULLvRcSoTQ9BMPY-hsRxXGrrx0n8YJJFycwYlwXRvZ8TAmLrvIyZCgh44mVS6H5sJhHUEyJnsnZOHWmZdpprQYpOoCxa5gq+ZKtK1xQL6+HMeePkutmxGkfJjk7uy4xuYKHkil5jpeq6-xygFQRBcgIW+v6gbcBmvmqqc8oQLo8VwBiTmaI8BKoClKb2hl5XRTKOXunlBZwMFqC+g1iWaMlSapam6XeVl2b+Z6Q2haWfqUfAUVZqC1GWOYuKQLAKgmvwwBcGQqlYMZO42uZ3GWTuFIABSXq0BEsf4PCkCwxTjJ2RaqkQxRlBUDBVAD+YhOEkTRLE8Rg0EESrOsnYfV9+bNYCUC-RV2Zw3AexlJ2M2o0Elr6oTDpgwoCTFKNqIAJRJFJKH8ZdqJUpeNE0UEsQwKQUAMAE+YvRFDmC0E4uDeSyBJAA5BicQwDLuMS4+z60LL8s5ErxQSx+X5eUkACMAAcyvi4BdCgeBkEOAGBDcA9htYFgdM64oZtaWR0u23o9swI7Ltm3QtA1V7SR4HbDtO3TuNKCycBM6hrNzuJ5gKDRaBcDkiBwC5HQkMHofySQnvyYov3nU9gPlJU1RwIbuMQxEUQxHEiRwDL6RYNrad03AdZwCIEBxAwMvwHkyioINhVTweGdZ-ASB56Ly8YAX1W1cwSSF5vyBr36cVbwf2l7+X-hsOOVf5kDtdG43YTN9Dbey13PdjJQjJzaClN9wPQ9xHACeU8loNjsBYIAA

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Solution

kinsyu•4/26/23, 3:09 AM

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Change return type based on value of parameters

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