Function isHtmlContent

actions/setup/js/error_helpers.cjs:11–13

* Detect whether a string looks like an HTML page rather than a plain error message. * Used to sanitize GitHub's "Unicorn" / gateway error HTML responses so they don't * pollute CI logs with hundreds of lines of markup. * * @param {string} str - The string to inspect * @returns {boolean} True w

(str)

 * @returns {boolean} True when the string appears to be an HTML document
 */
function isHtmlContent(str) {
  return /^\s*<!DOCTYPE\s/i.test(str) || /^\s*<html[\s>]/i.test(str);
}

/**
 * Safely extract an error message from an unknown error value.