Theo's Typesafe Cult•2y ago

Type a function based on its argument value.

I have a function that takes an object and a boolean (default to false). It will return an array of object with key id only if parameter bool of the function set to true.

  const helpMeTypeThis = (obj: MyObj, bool = false)
    : {id?: string | undefinded, [key: string]: any }[] => {
    return obj.map(...)
  }

helpMeTypeThis(obj)  // => { [key: string]: any }
helpMeTypeThis(obj, false)  // => { [key: string]: any }
helpMeTypeThis(obj, true)  // => { id: string, [key: string]: any }

  const helpMeTypeThis = (obj: MyObj, bool = false)
    : {id?: string | undefinded, [key: string]: any }[] => {
    return obj.map(...)
  }

helpMeTypeThis(obj)  // => { [key: string]: any }
helpMeTypeThis(obj, false)  // => { [key: string]: any }
helpMeTypeThis(obj, true)  // => { id: string, [key: string]: any }

1 Reply

Unknown User•2y ago

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Type a function based on its argument value.