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node_modules/eslint/lib/rules/symbol-description.js 1.86 KB
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  /**
   * @fileoverview Rule to enforce description with the `Symbol` object
   * @author Jarek Rencz
   */
  
  "use strict";
  
  //------------------------------------------------------------------------------
  // Requirements
  //------------------------------------------------------------------------------
  
  const astUtils = require("../ast-utils");
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  
  module.exports = {
      meta: {
          docs: {
              description: "require symbol descriptions",
              category: "ECMAScript 6",
              recommended: false,
              url: "https://eslint.org/docs/rules/symbol-description"
          },
  
          schema: []
      },
  
      create(context) {
  
          /**
           * Reports if node does not conform the rule in case rule is set to
           * report missing description
           *
           * @param {ASTNode} node - A CallExpression node to check.
           * @returns {void}
           */
          function checkArgument(node) {
              if (node.arguments.length === 0) {
                  context.report({
                      node,
                      message: "Expected Symbol to have a description."
                  });
              }
          }
  
          return {
              "Program:exit"() {
                  const scope = context.getScope();
                  const variable = astUtils.getVariableByName(scope, "Symbol");
  
                  if (variable && variable.defs.length === 0) {
                      variable.references.forEach(reference => {
                          const node = reference.identifier;
  
                          if (astUtils.isCallee(node)) {
                              checkArgument(node.parent);
                          }
                      });
                  }
              }
          };
  
      }
  };