code: function checkWhiteSpace(node) {
              const operator = sourceCode.getFirstToken(node),
                  nextToken = sourceCode.getTokenAfter(operator),
                  hasWhitespace = sourceCode.isSpaceBetweenTokens(operator, nextToken);
              let type;
  
              switch (node.type) {
                  case "SpreadElement":
                      type = "spread";
                      if (node.parent.type === "ObjectExpression") {
                          type += " property";
                      }
                      break;
                  case "RestElement":
                      type = "rest";
                      if (node.parent.type === "ObjectPattern") {
                          type += " property";
                      }
                      break;
                  case "ExperimentalSpreadProperty":
                      type = "spread property";
                      break;
                  case "ExperimentalRestProperty":
                      type = "rest property";
                      break;
                  default:
                      return;
              }
  
              if (alwaysSpace && !hasWhitespace) {
                  context.report({
                      node,
                      loc: {
                          line: operator.loc.end.line,
                          column: operator.loc.end.column
                      },
                      message: "Expected whitespace after {{type}} operator.",
                      data: {
                          type
                      },
                      fix(fixer) {
                          return fixer.replaceTextRange([operator.range[1], nextToken.range[0]], " ");
                      }
                  });
              } else if (!alwaysSpace && hasWhitespace) {
                  context.report({
                      node,
                      loc: {
                          line: operator.loc.end.line,
                          column: operator.loc.end.column
                      },
                      message: "Unexpected whitespace after {{type}} operator.",
                      data: {
                          type
                      },
                      fix(fixer) {
                          return fixer.removeRange([operator.range[1], nextToken.range[0]]);
                      }
                  });
              }
          }
docs: -------------------------------------------------------------------------- Helpers -------------------------------------------------------------------------- 
  Checks whitespace between rest/spread operators and their expressions
  @param {ASTNode} node - The node to check
  @returns {void}