Tips for enhancing the TypeScript definition of Material UI 3 theme by integrating the Material UI pickers theme

Trying to enhance the Material-UI theme with the Typescript typings of Material-UI-Pickers for the latest versions listed here:

"@material-ui/core": "^3.9.2",
"material-ui-pickers": "^2.2.1",

A note on the bottom of the Material UI picker page mentions that the theme can be expanded using Typescript Theme augmentation.

The recommendation is as follows:

declare module '@material-ui/core/styles/overrides' {
    import { MuiPickersOverrides } from 'material-ui-pickers/typings/overrides'
    export interface Overrides extends MuiPickersOverrides { }
}

However, in the Material UI override.d.ts file, Overrides is not an interface but a type, indicating that it may not be extendable in this manner. This leads to the assumption that the Material-UI typings have undergone significant changes, rendering the Material-UI-Pickers guide and typings outdated.

Seeking guidance on correctly extending the theme typings. Any insights?

typescriptmaterial-uithemes

Answer №1

Successfully resolved the issue. In the realm of MuiPickers, a mapping of property names to style rules is utilized, while in the most recent versions of Material UI, a mapping of property names to classes names is employed.

The problem can be solved by creating a file named overrides-mui.d.ts that contains the following code:

import { Overrides } from "@material-ui/core/styles/overrides";
import { MuiPickersOverrides } from 'material-ui-pickers/typings/overrides'

type overridesNameToClassKey = { [P in keyof MuiPickersOverrides]: keyof 
MuiPickersOverrides[P] }

declare module "@material-ui/core/styles/overrides" {
    export interface ComponentNameToClassKey extends overridesNameToClassKey { }
}

The only challenges arise with style selectors like &$selected.

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