Function parameter to use interface's function signature

Question

I have a function signature in an interface which I'd like to use as the signature for a callback parameter in some class.

export interface IGrid {
    gridFormat(gridCell: GridCell, grid: Grid): boolean
}

I'd like to do something like this:

validateFormat(validator: IGrid.gridFormat) {
    // ...
}

Is this possible?

basarat · Accepted Answer · 2017-06-19 05:03:52Z

5

Is this possible?

Yes as shown below:

export interface IGrid {
    gridFormat(gridCell: GridCell, grid: Grid): boolean
}

function validateFormat(validator: IGrid['gridFormat']) { // MAGIC 🌹
    // ...
}

answered Jun 19, 2017 at 5:03

basarat

278k61 gold badges475 silver badges528 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Sayan Pal · Accepted Answer · 2017-06-19 11:11:58Z

1

You may try something like the following:

export interface IGrid {
  gridFormat(gridCell: GridCell, grid: Grid): boolean
}

declare let igrid: IGrid;

export class Test {
  validateFormat(validator: typeof igrid.gridFormat) {
    // ...
  }
}

Additionally, you may also declare a type for the method like below

declare type gridFormatMethodType = typeof igrid.gridFormat

to avoid the cumbersome method signature for validateFormat

validateFormat(validator: gridFormatMethodType){ ... }

Hope this helps.

edited Jun 19, 2017 at 11:11

answered Jun 19, 2017 at 5:02

Sayan Pal

4,9767 gold badges47 silver badges85 bronze badges

Collectives™ on Stack Overflow

Function parameter to use interface's function signature

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related