@atlaskit/app-provider/dist/es2019/theme-provider/index.js

A top level provider for the Design System.

/* index.tsx generated by @compiled/babel-plugin v3.0.2 */
import _extends from "@babel/runtime/helpers/extends";
import "./index.compiled.css";
import { ax, ix } from "@compiled/react/runtime";
import React, { useCallback, useEffect, useRef, useState } from 'react';
import { bind } from 'bind-event-listener';
import { SUBTREE_THEME_ATTRIBUTE } from '@atlaskit/tokens/constants';
import { getThemeHtmlAttrs } from '@atlaskit/tokens/get-theme-html-attrs';
import { setGlobalTheme } from '@atlaskit/tokens/set-global-theme';
import { useIsAppProviderThemingEnabled } from '../use-is-app-provider-theming-enabled';
import { useIsInsideAppProvider } from '../use-is-inside-app-provider';
import { ColorModeContext } from './context/color-mode';
import { InsideThemeProviderContext } from './context/inside-theme-provider';
import { SetColorModeContext } from './context/set-color-mode-context';
import { SetThemeContext, ThemeContext } from './context/theme';
import { useIsInsideThemeProvider } from './hooks/use-is-inside-theme-provider';
import { loadAndMountThemes } from './utils/load-and-mount-themes';
const defaultThemeSettings = {
  dark: 'dark',
  light: 'light',
  shape: 'shape',
  spacing: 'spacing',
  typography: 'typography'
};
const isMatchMediaAvailable = typeof window !== 'undefined' && 'matchMedia' in window;
const prefersDarkModeMql = isMatchMediaAvailable ? window.matchMedia('(prefers-color-scheme: dark)') : undefined;

// TODO: currently 'auto' color mode will always return 'light' in SSR.
// Additional work required: https://product-fabric.atlassian.net/browse/DSP-9781
function getReconciledColorMode(colorMode) {
  if (colorMode === 'auto') {
    return prefersDarkModeMql !== null && prefersDarkModeMql !== void 0 && prefersDarkModeMql.matches ? 'dark' : 'light';
  }
  return colorMode;
}
const contentStyles = {
  body: "_1e0c1bgi"
};
/**
 * __Theme provider__
 *
 * Provides global theming configuration.
 */
export function ThemeProvider({
  children,
  defaultColorMode = 'auto',
  defaultTheme
}) {
  const [chosenColorMode, setChosenColorMode] = useState(defaultColorMode);
  const [reconciledColorMode, setReconciledColorMode] = useState(getReconciledColorMode(defaultColorMode));
  const [theme, setTheme] = useState(() => ({
    ...defaultThemeSettings,
    ...defaultTheme
  }));
  const setColorMode = useCallback(colorMode => {
    setChosenColorMode(colorMode);
    setReconciledColorMode(getReconciledColorMode(colorMode));
  }, []);
  const setPartialTheme = useCallback(nextTheme => {
    setTheme(theme => ({
      ...theme,
      ...nextTheme
    }));
  }, []);
  const lastSetGlobalThemePromiseRef = useRef(null);
  const isInsideAppProvider = useIsInsideAppProvider();
  const isAppProviderThemingEnabled = useIsAppProviderThemingEnabled();
  const isInsideThemeProvider = useIsInsideThemeProvider();
  /**
   * A top-level ThemeProvider is detected by being the first ThemeProvider inside an AppProvider.
   *
   * This will not use sub-tree theming but instead set the global theme state using the
   * `@atlaskit/tokens` APIs, as it's required for styling root `html` and `body` elements
   * for compatibility with `@atlaskit/css-reset`.
   *
   * In the future we could consider moving away from DOM mutations and require AppProvider to wrap
   * `html` in order to apply global theme state, which would allow a more consistent approach to
   * theme loading.
   */
  const isRootThemeProvider = isInsideAppProvider && !isInsideThemeProvider && isAppProviderThemingEnabled;
  useEffect(() => {
    if (isRootThemeProvider) {
      /**
       * We need to wait for any previous `setGlobalTheme` calls to finish before calling it again.
       * This is to prevent race conditions as `setGlobalTheme` is async and mutates the DOM (e.g. sets the
       * `data-color-mode` attribute on the root element).
       *
       * Since we can't safely abort the `setGlobalTheme` execution, we need to wait for it to properly finish before
       * applying the new theme.
       *
       * Without this, we can end up in the following scenario:
       * 1. app loads with the default 'light' theme, kicking off `setGlobalTheme`
       * 2. app switches to 'dark' theme after retrieving value persisted in local storage, calling `setGlobalTheme` again
       * 3. `setGlobalTheme` function execution for `dark` finishes before the initial `light` execution
       * 4. `setGlobalTheme` function execution for `light` then finishes, resulting in the 'light' theme being applied.
       */
      const cleanupLastFnCall = async () => {
        if (lastSetGlobalThemePromiseRef.current) {
          const unbindFn = await lastSetGlobalThemePromiseRef.current;
          unbindFn();
          lastSetGlobalThemePromiseRef.current = null;
        }
      };
      const safelySetGlobalTheme = async () => {
        await cleanupLastFnCall();
        const promise = setGlobalTheme({
          ...theme,
          colorMode: reconciledColorMode
        });
        lastSetGlobalThemePromiseRef.current = promise;
      };
      safelySetGlobalTheme();
      return function cleanup() {
        cleanupLastFnCall();
      };
    }
    // For other theme providers (whether outside AppProvider or nested inside a ThemeProvider),
    // we treat them as sub-tree themes that do not load global theme state.
    loadAndMountThemes(theme);
  }, [isInsideAppProvider, isInsideThemeProvider, isRootThemeProvider, reconciledColorMode, theme]);
  useEffect(() => {
    if (!prefersDarkModeMql) {
      return;
    }
    const unbindListener = bind(prefersDarkModeMql, {
      type: 'change',
      listener: event => {
        if (chosenColorMode === 'auto') {
          setReconciledColorMode(event.matches ? 'dark' : 'light');
        }
      }
    });
    return unbindListener;
  }, [chosenColorMode]);
  const attrs = {
    ...getThemeHtmlAttrs({
      ...theme,
      colorMode: reconciledColorMode
    }),
    [SUBTREE_THEME_ATTRIBUTE]: true
  };
  return /*#__PURE__*/React.createElement(InsideThemeProviderContext.Provider, {
    value: true
  }, /*#__PURE__*/React.createElement(ColorModeContext.Provider, {
    value: reconciledColorMode
  }, /*#__PURE__*/React.createElement(SetColorModeContext.Provider, {
    value: setColorMode
  }, /*#__PURE__*/React.createElement(ThemeContext.Provider, {
    value: theme
  }, /*#__PURE__*/React.createElement(SetThemeContext.Provider, {
    value: setPartialTheme
  }, !isRootThemeProvider ? /*#__PURE__*/React.createElement("div", _extends({}, attrs, {
    className: ax([contentStyles.body])
  }), children) : children)))));
}