code: function getOperatorToken(node) {
              return sourceCode.getFirstTokenBetween(node.left, node.right, token => token.value === node.operator);
          }
docs: Returns the operator token of an AssignmentExpression or BinaryExpression
  @param {ASTNode} node An AssignmentExpression or BinaryExpression node
  @returns {Token} The operator token in the node