How can you define the types of function arguments when destructuring arguments in TypeScript?

Question

How can you define the types of function arguments when destructuring arguments in TypeScript?

TS throws an error that states:

Error:(8, 20) TS7031: Binding element 'on' implicitly has an 'any' type.

Error:(8, 24) TS7031: Binding element 'children' implicitly has an 'any' type.

Below is the function I am working with. It takes in two arguments.

// 
function On({on, children}) {
  return (
    <div>{on} {children}</div>
  )
}

I am trying to specify types for the arguments in this scenario. However, the usual syntax does not seem to work:

function On({(on as boolean), (children as HTMLElement[])}) {
function On({(on: boolean), (children: HTMLElement[])}) {
function On({on: boolean, children: HTMLElement[]}) {
  return (
    <div>{on} {children}</div>
  )
}

typescript

Answer 1

Answer №1

Try it like so:

function Toggle({toggle, items} : {toggle: boolean, items: HTMLElement[] }) {
    // your implementation here
}

If you have a specific type/interface defined for the entire object, it can enhance readability of your code:

interface ToggleOptions {
    toggle: boolean;
    items: HTMLElement[];
    additionalProperty: string;
}

function Toggle({toggle, items} : ToggleOptions) {
    // your implementation here
}

Answer 2

Try it like so:

function Toggle({toggle, items} : {toggle: boolean, items: HTMLElement[] }) {
    // your implementation here
}

If you have a specific type/interface defined for the entire object, it can enhance readability of your code:

interface ToggleOptions {
    toggle: boolean;
    items: HTMLElement[];
    additionalProperty: string;
}

function Toggle({toggle, items} : ToggleOptions) {
    // your implementation here
}

Answer 3

Answer №2

For more information on Function declarations, refer to the relevant section.

type myType = { active: boolean, items: Element[]}
function Active({active, items} : myType ) {
    // insert your code here
}

Answer 4

For more information on Function declarations, refer to the relevant section.

type myType = { active: boolean, items: Element[]}
function Active({active, items} : myType ) {
    // insert your code here
}

How can you define the types of function arguments when destructuring arguments in TypeScript?

Answer №1

Answer №2

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