Adding TypeScript types to an array within a function parameter: A step-by-step guide

Having some trouble defining the array type: The code below is functioning perfectly:

const messageCustomStyles: Array<keyof IAlertMessage> = [
            'font',
            'margin',
            'padding'
        ];
return getCustomStylesFrom(styles, 'message', messageCustomStyles);

I am trying to move this array into a function argument with its type, like this:

return getCustomStylesFrom(
  styles, 
  'message', 
  ['font', 'margin', 'padding']: Array<keyof IAlertMessage>);

However, I'm getting a TypeScript error saying 'Expected 3 arguments, but got 4.' It seems like it's treating the type after ':' as a new parameter.

Any suggestions on how to resolve this issue?

javascripttypescript

Answer №1

Here is one way to accomplish it:

extractStyles(
  customStyles, 
  'document', 
  ['color', 'border', 'background'] as Array<keyof IDocumentStyle>);

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