index.js

const expressions = [
  /^https?:\/\/img\.shields\.io/,
  /^https?:\/\/(?:(?:www|api|secure)\.)?travis-ci\.org\/.*\.(?:svg|png)(?:\?|$)/,
  /^https?:\/\/(?:www\.)?david-dm\.org(?:\/.+){2}\.(?:svg|png)/,
  /^https?:\/\/(?:www\.)?nodei\.co(?:\/.+){2}\.(?:svg|png)(?:\?|$)/,
  /^https?:\/\/inch-ci\.org(?:\/.+){3}\.(?:svg|png)(?:\?|$)/,
  /^https?:\/\/badge\.fury\.io(?:\/[^/]+){2}\.(?:svg|png)(?:\?|$)/,
  /^https?:\/\/ci\.testling\.com(?:\/[^/]+){2}\.(?:svg|png)(?:\?|$)/,
  /^https?:\/\/saucelabs\.com\/(?:buildstatus|browser-matrix)\//,
  /^https?:\/\/coveralls\.io\/.*\/badge\.(?:svg|png)(?:\?|$)/,
  /^https?:\/\/codecov\.io\/gh(?:\/[^/]+){2}(?:\/branch\/[^/]+)?(?:\/graph)?\/badge\.svg/,
  /^https?:\/\/codeclimate\.com\/github(?:\/[^/]+){2}(?:\/badges\/(gpa|issue_count|coverage))?\.(png|svg)(?:\?|$)/,
  /^https?:\/\/issuestats\.com\/github(?:\/[^/]+){2}\/badge\/(pr|issue)\/?(?:\?|$)/,
  /^https?:\/\/badges\.gitter\.im(?:\/.+){2}\.(?:svg|png)/,
  /^https?:\/\/(?:www\.)?github\.com(?:\/[^/]+){2}\/workflows\/[^/]+\/badge\.svg(?:\?|$)/,
  /^https?:\/\/(?:www\.)?opencollective\.com\/[^/]+\/(sponsors|backers)\/badge.svg(?:\?|$)/
]

/**
 * Check if `url` is a badge.
 *
 * @param {string} url
 *   URL to something.
 * @returns {boolean}
 *   Whether `url` is a badge.
 */
export function isBadge(url) {
  let index = -1

  if (typeof url !== 'string') {
    throw new TypeError('is-badge expected string')
  }

  while (++index < expressions.length) {
    if (expressions[index].test(url)) {
      return true
    }
  }

  return false
}