Is it Possible for the Number Array Type to Not Be Recognized as an Array?


        export class ... {
            single: any[] = [];
            multi: any[] = [];

            view: number[] = [700, 400];
            ... <Removed for brevity>
        }

Error Message: It says 'Type 'number[]' is not assignable to type '[number, number]'

I am perplexed by this error. I declared a variable as a number array, yet when it's used in the template, this error pops up. Has anyone encountered this before?

The workaround I found was to directly use the array itself -- [view]=[700, 400] -- in the template. Quite confusing since it ought to work as expected.

Thank you.

angulartypescriptngx-charts

Answer №1

Your template is set up to accept a tuple of two numbers, but you mistakenly typed view as an array of numbers. The solution is to change the typing of view to a tuple.

view: [number, number] = [700, 400];

If necessary, you can create your own method called toTuple to convert a number array like view into a tuple.

type Tuple<T, N extends number, R extends T[] = []> = R['length'] extends N ? R : Tuple<T, N, [T, ...R]>;
function toTuple<T, L extends number>(values: T[], length: L): Tuple<T, L> {
  if (values.length < length) {
      throw new Error('invalid values length');
  }
  return values.slice(0, length) as Tuple<T, L>;
}

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