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node_modules/eslint/lib/rules/no-sparse-arrays.js 1.04 KB
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  /**
   * @fileoverview Disallow sparse arrays
   * @author Nicholas C. Zakas
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = {
      meta: {
          docs: {
              description: "disallow sparse arrays",
              category: "Possible Errors",
              recommended: true,
              url: "https://eslint.org/docs/rules/no-sparse-arrays"
          },
  
          schema: []
      },
  
      create(context) {
  
  
          //--------------------------------------------------------------------------
          // Public
          //--------------------------------------------------------------------------
  
          return {
  
              ArrayExpression(node) {
  
                  const emptySpot = node.elements.indexOf(null) > -1;
  
                  if (emptySpot) {
                      context.report({ node, message: "Unexpected comma in middle of array." });
                  }
              }
  
          };
  
      }
  };