code: function splitDeclarations(declaration) {
              return fixer => declaration.declarations.map(declarator => {
                  const tokenAfterDeclarator = sourceCode.getTokenAfter(declarator);
  
                  if (tokenAfterDeclarator === null) {
                      return null;
                  }
  
                  const afterComma = sourceCode.getTokenAfter(tokenAfterDeclarator, { includeComments: true });
  
                  if (tokenAfterDeclarator.value !== ",") {
                      return null;
                  }
  
                  /*
                   * `var x,y`
                   * tokenAfterDeclarator ^^ afterComma
                   */
                  if (afterComma.range[0] === tokenAfterDeclarator.range[1]) {
                      return fixer.replaceText(tokenAfterDeclarator, `; ${declaration.kind} `);
                  }
  
                  /*
                   * `var x,
                   * tokenAfterDeclarator ^
                   *      y`
                   *      ^ afterComma
                   */
                  if (
                      afterComma.loc.start.line > tokenAfterDeclarator.loc.end.line ||
                      afterComma.type === "Line" ||
                      afterComma.type === "Block"
                  ) {
                      let lastComment = afterComma;
  
                      while (lastComment.type === "Line" || lastComment.type === "Block") {
                          lastComment = sourceCode.getTokenAfter(lastComment, { includeComments: true });
                      }
  
                      return fixer.replaceTextRange(
                          [tokenAfterDeclarator.range[0], lastComment.range[0]],
                          `;${sourceCode.text.slice(tokenAfterDeclarator.range[1], lastComment.range[0])}${declaration.kind} `
                      );
                  }
  
                  return fixer.replaceText(tokenAfterDeclarator, `; ${declaration.kind}`);
              }).filter(x => x);
          }
docs: Fixer to split a VariableDeclaration into individual declarations
  @param   {VariableDeclaration}   declaration The `VariableDeclaration` to split
  @returns {Function}                          The fixer function