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node_modules/eslint/lib/rules/no-shadow-restricted-names.js 1.95 KB
f7563de62   Palak Handa   first commit
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  /**
   * @fileoverview Disallow shadowing of NaN, undefined, and Infinity (ES5 section 15.1.1)
   * @author Michael Ficarra
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = {
      meta: {
          docs: {
              description: "disallow identifiers from shadowing restricted names",
              category: "Variables",
              recommended: false
          },
  
          schema: []
      },
  
      create(context) {
  
          const RESTRICTED = ["undefined", "NaN", "Infinity", "arguments", "eval"];
  
          /**
           * Check if the node name is present inside the restricted list
           * @param {ASTNode} id id to evaluate
           * @returns {void}
           * @private
           */
          function checkForViolation(id) {
              if (RESTRICTED.indexOf(id.name) > -1) {
                  context.report({
                      node: id,
                      message: "Shadowing of global property '{{idName}}'.",
                      data: {
                          idName: id.name
                      }
                  });
              }
          }
  
          return {
              VariableDeclarator(node) {
                  checkForViolation(node.id);
              },
              ArrowFunctionExpression(node) {
                  [].map.call(node.params, checkForViolation);
              },
              FunctionExpression(node) {
                  if (node.id) {
                      checkForViolation(node.id);
                  }
                  [].map.call(node.params, checkForViolation);
              },
              FunctionDeclaration(node) {
                  if (node.id) {
                      checkForViolation(node.id);
                      [].map.call(node.params, checkForViolation);
                  }
              },
              CatchClause(node) {
                  checkForViolation(node.param);
              }
          };
  
      }
  };