code: function checkSpacingAroundTokenBefore(node) {
              if (node) {
                  const token = sourceCode.getTokenBefore(node, astUtils.isKeywordToken);
  
                  checkSpacingAround(token);
              }
          }
docs: Reports the previous token of a given node if the token is a keyword and
  usage of spacing around the token is invalid.
  
  @param {ASTNode|null} node - A node to report.
  @returns {void}