code: function detectOpenSpaces(node) {
              const lastCalleeToken = sourceCode.getLastToken(node.callee);
              let prevToken = lastCalleeToken,
                  parenToken = sourceCode.getTokenAfter(lastCalleeToken);
  
              // advances to an open parenthesis.
              while (
                  parenToken &&
                  parenToken.range[1] < node.range[1] &&
                  parenToken.value !== "("
              ) {
                  prevToken = parenToken;
                  parenToken = sourceCode.getTokenAfter(parenToken);
              }
  
              // look for a space between the callee and the open paren
              if (parenToken &&
                  parenToken.range[1] < node.range[1] &&
                  sourceCode.isSpaceBetweenTokens(prevToken, parenToken)
              ) {
                  context.report({
                      node,
                      loc: lastCalleeToken.loc.start,
                      message: "Unexpected space between function name and paren.",
                      fix(fixer) {
                          return fixer.removeRange([prevToken.range[1], parenToken.range[0]]);
                      }
                  });
              }
          }
docs: Check if open space is present in a function name
  @param {ASTNode} node node to evaluate
  @returns {void}
  @private