@emotion/react/types/jsx-namespace.d.ts

> Simple styling in React.

import 'react'
import { Interpolation } from '@emotion/serialize'
import { Theme } from './index'

type WithConditionalCSSProp<P> = 'className' extends keyof P
  ? string extends P['className' & keyof P]
    ? { css?: Interpolation<Theme> }
    : {}
  : {}

// unpack all here to avoid infinite self-referencing when defining our own JSX namespace
type ReactJSXElement = JSX.Element
type ReactJSXElementClass = JSX.ElementClass
type ReactJSXElementAttributesProperty = JSX.ElementAttributesProperty
type ReactJSXElementChildrenAttribute = JSX.ElementChildrenAttribute
type ReactJSXLibraryManagedAttributes<C, P> = JSX.LibraryManagedAttributes<C, P>
type ReactJSXIntrinsicAttributes = JSX.IntrinsicAttributes
type ReactJSXIntrinsicClassAttributes<T> = JSX.IntrinsicClassAttributes<T>
type ReactJSXIntrinsicElements = JSX.IntrinsicElements

export namespace EmotionJSX {
  interface Element extends ReactJSXElement {}
  interface ElementClass extends ReactJSXElementClass {}
  interface ElementAttributesProperty
    extends ReactJSXElementAttributesProperty {}
  interface ElementChildrenAttribute extends ReactJSXElementChildrenAttribute {}

  type LibraryManagedAttributes<C, P> = WithConditionalCSSProp<P> &
    ReactJSXLibraryManagedAttributes<C, P>

  interface IntrinsicAttributes extends ReactJSXIntrinsicAttributes {}
  interface IntrinsicClassAttributes<T>
    extends ReactJSXIntrinsicClassAttributes<T> {}

  type IntrinsicElements = {
    [K in keyof ReactJSXIntrinsicElements]: ReactJSXIntrinsicElements[K] & {
      css?: Interpolation<Theme>
    }
  }
}