Function describeComponentFrame

docs/external/js/react-dom.development.js:1374–1404

(name, source, ownerName)

  var BEFORE_SLASH_RE = /^(.*)[\\\/]/;
  function describeComponentFrame (name, source, ownerName) {
    var sourceInfo = '';

    if (source) {
      var path = source.fileName;
      var fileName = path.replace(BEFORE_SLASH_RE, '');

      {
        // In DEV, include code for a common special case:
        // prefer "folder/index.js" instead of just "index.js".
        if (/^index\./.test(fileName)) {
          var match = path.match(BEFORE_SLASH_RE);

          if (match) {
            var pathBeforeSlash = match[1];

            if (pathBeforeSlash) {
              var folderName = pathBeforeSlash.replace(BEFORE_SLASH_RE, '');
              fileName = folderName + '/' + fileName;
            }
          }
        }
      }

      sourceInfo = ' (at ' + fileName + ':' + source.lineNumber + ')';
    } else if (ownerName) {
      sourceInfo = ' (created by ' + ownerName + ')';
    }

    return '\n    in ' + (name || 'Unknown') + sourceInfo;
  }

  // The Symbol used to tag the ReactElement-like types. If there is no native Symbol
  // nor polyfill, then a plain number is used for performance.