@primer/react/dist/live-region/Announce.js

An implementation of GitHub's Primer Design System using React

import { c } from 'react-compiler-runtime';
import { announceFromElement } from '@primer/live-region-element';
import { useRef, useState, useEffect } from 'react';
import { useEffectOnce } from '../internal/hooks/useEffectOnce.js';
import { useEffectCallback } from '../internal/hooks/useEffectCallback.js';
import { jsx } from 'react/jsx-runtime';

/**
 * `Announce` is a component that will announce the text content of the
 * `children` passed in to screen readers using the given politeness level. It
 * will also announce any changes to the text content of `children`
 */
function Announce(props) {
  const $ = c(25);
  let children;
  let delayMs;
  let rest;
  let t0;
  let t1;
  let t2;
  let t3;
  if ($[0] !== props) {
    ({
      as: t0,
      announceOnShow: t1,
      children,
      delayMs,
      hidden: t2,
      politeness: t3,
      ...rest
    } = props);
    $[0] = props;
    $[1] = children;
    $[2] = delayMs;
    $[3] = rest;
    $[4] = t0;
    $[5] = t1;
    $[6] = t2;
    $[7] = t3;
  } else {
    children = $[1];
    delayMs = $[2];
    rest = $[3];
    t0 = $[4];
    t1 = $[5];
    t2 = $[6];
    t3 = $[7];
  }
  const BaseComponent = t0 === undefined ? "div" : t0;
  const announceOnShow = t1 === undefined ? true : t1;
  const hidden = t2 === undefined ? false : t2;
  const politeness = t3 === undefined ? "polite" : t3;
  const ref = useRef(null);
  const [previousAnnouncementText, setPreviousAnnouncementText] = useState(null);
  const savedAnnouncement = useRef(null);
  let t4;
  if ($[8] !== delayMs || $[9] !== hidden || $[10] !== politeness || $[11] !== previousAnnouncementText) {
    t4 = () => {
      var _savedAnnouncement$cu;
      const {
        current: element
      } = ref;
      if (!element) {
        return;
      }
      if (hidden) {
        return;
      }
      const style = window.getComputedStyle(element);
      if (style.display === "none") {
        return;
      }
      if (style.visibility === "hidden") {
        return;
      }
      const textContent = getTextContent(element);
      if (textContent === previousAnnouncementText) {
        return;
      }
      (_savedAnnouncement$cu = savedAnnouncement.current) === null || _savedAnnouncement$cu === void 0 ? void 0 : _savedAnnouncement$cu.cancel();
      savedAnnouncement.current = announceFromElement(element, politeness === "assertive" ? {
        politeness
      } : {
        politeness,
        delayMs
      });
      setPreviousAnnouncementText(textContent);
    };
    $[8] = delayMs;
    $[9] = hidden;
    $[10] = politeness;
    $[11] = previousAnnouncementText;
    $[12] = t4;
  } else {
    t4 = $[12];
  }
  const announce = useEffectCallback(t4);
  let t5;
  if ($[13] !== announce || $[14] !== announceOnShow) {
    t5 = () => {
      if (announceOnShow) {
        announce();
      }
    };
    $[13] = announce;
    $[14] = announceOnShow;
    $[15] = t5;
  } else {
    t5 = $[15];
  }
  useEffectOnce(t5);
  let t6;
  let t7;
  if ($[16] !== announce) {
    t6 = () => {
      const {
        current: container
      } = ref;
      if (container === null) {
        return;
      }
      const observer = new MutationObserver(() => {
        announce();
      });
      observer.observe(container, {
        subtree: true,
        childList: true,
        characterData: true
      });
      return () => {
        observer.disconnect();
      };
    };
    t7 = [announce];
    $[16] = announce;
    $[17] = t6;
    $[18] = t7;
  } else {
    t6 = $[17];
    t7 = $[18];
  }
  useEffect(t6, t7);
  let t8;
  let t9;
  if ($[19] === Symbol.for("react.memo_cache_sentinel")) {
    t8 = () => () => {
      if (savedAnnouncement.current !== null) {
        savedAnnouncement.current.cancel();
        savedAnnouncement.current = null;
      }
    };
    t9 = [];
    $[19] = t8;
    $[20] = t9;
  } else {
    t8 = $[19];
    t9 = $[20];
  }
  useEffect(t8, t9);
  let t10;
  if ($[21] !== BaseComponent || $[22] !== children || $[23] !== rest) {
    t10 = /*#__PURE__*/jsx(BaseComponent, {
      ...rest,
      ref: ref,
      children: children
    });
    $[21] = BaseComponent;
    $[22] = children;
    $[23] = rest;
    $[24] = t10;
  } else {
    t10 = $[24];
  }
  return t10;
}
function getTextContent(element) {
  let value = '';
  if (element.hasAttribute('aria-label')) {
    value = element.getAttribute('aria-label');
  } else if (element.textContent) {
    value = element.textContent;
  }
  return value ? value.trim() : '';
}

export { Announce };