What is the best way to programmatically define the value for the MaterialUI grid size property using TypeScript?

Question

What is the best way to programmatically define the value for the MaterialUI grid size property using TypeScript?

Is there a way to dynamically pass a value to the Grid size props like XL in TypeScript?

For instance, *Update for further clarification

import Grid, { GridSize } from "@material-ui/core/Grid";
let value: GridSize = 12/4;
xl={value}

Error: Type 'number' is not assignable to type 'GridSize'

If I define a custom type as,

type gridSize = boolean | "auto" | 1 | 2 | 12 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | undefined

Error: Type 'number' is not assignable to type 'boolean | "auto" | 1 | 2 | 12 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | undefined'.ts(2769)

The issue remains the same - how can a number be converted to this type?

** Answer Marked Below that helped, In the end I cast it as GridSize and added some unit tests around it for edgecases.

let value = 12/4 as GridSize

typescript material-ui

Answer 1

Answer №1

If you're working with GridSize, there's a predefined type that you can utilize in your code.

export type GridSize = 'auto' | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12;

For example:

import Grid, { GridSize } from "@material-ui/core/Grid";

const App = () => {
  let size: GridSize = 1;

  return <Grid xl={size}>
  </Grid>
}

render(<App />, document.getElementById("root"));

--Update

I've noticed that the xl prop also accepts boolean and undefined

You have the option to expand the GridSize type to include these two.

type NewGridSize = GridSize | boolean | undefined;

let size: NewGridSize  = undefined;

--Update

Typescript doesn't possess advanced flow control analysis to assume this value is 3

In such scenarios, you may need to use a workaround to cast it as any.

let value: GridSize = 12/4 as any;

Alternatively, you could create a typesguard (but that might be excessive)

function compute(value: any): value is 3 {
  return value;
}

Answer 2

If you're working with GridSize, there's a predefined type that you can utilize in your code.

export type GridSize = 'auto' | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12;

For example:

import Grid, { GridSize } from "@material-ui/core/Grid";

const App = () => {
  let size: GridSize = 1;

  return <Grid xl={size}>
  </Grid>
}

render(<App />, document.getElementById("root"));

--Update

I've noticed that the xl prop also accepts boolean and undefined

You have the option to expand the GridSize type to include these two.

type NewGridSize = GridSize | boolean | undefined;

let size: NewGridSize  = undefined;

--Update

Typescript doesn't possess advanced flow control analysis to assume this value is 3

In such scenarios, you may need to use a workaround to cast it as any.

let value: GridSize = 12/4 as any;

Alternatively, you could create a typesguard (but that might be excessive)

function compute(value: any): value is 3 {
  return value;
}

What is the best way to programmatically define the value for the MaterialUI grid size property using TypeScript?

Answer №1

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