@wordpress/a11y/build-module/shared/filter-message.js

Accessibility (a11y) utilities for WordPress.

let previousMessage = '';

/**
 * Filter the message to be announced to the screenreader.
 *
 * @param {string} message The message to be announced.
 *
 * @return {string} The filtered message.
 */
export default function filterMessage(message) {
  /*
   * Strip HTML tags (if any) from the message string. Ideally, messages should
   * be simple strings, carefully crafted for specific use with A11ySpeak.
   * When re-using already existing strings this will ensure simple HTML to be
   * stripped out and replaced with a space. Browsers will collapse multiple
   * spaces natively.
   */
  message = message.replace(/<[^<>]+>/g, ' ');

  /*
   * Safari + VoiceOver don't announce repeated, identical strings. We use
   * a `no-break space` to force them to think identical strings are different.
   */
  if (previousMessage === message) {
    message += '\u00A0';
  }
  previousMessage = message;
  return message;
}
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