.config/coc/extensions/node_modules/coc-prettier/node_modules/eslint/lib/rules/no-inner-declarations.js

   1 /**
   2  * @fileoverview Rule to enforce declarations in program or function body root.
   3  * @author Brandon Mills
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const astUtils = require("./utils/ast-utils");
  13
  14 //------------------------------------------------------------------------------
  15 // Rule Definition
  16 //------------------------------------------------------------------------------
  17
  18 const validParent = new Set(["Program", "ExportNamedDeclaration", "ExportDefaultDeclaration"]);
  19 const validBlockStatementParent = new Set(["FunctionDeclaration", "FunctionExpression", "ArrowFunctionExpression"]);
  20
  21 module.exports = {
  22     meta: {
  23         type: "problem",
  24
  25         docs: {
  26             description: "disallow variable or `function` declarations in nested blocks",
  27             category: "Possible Errors",
  28             recommended: true,
  29             url: "https://eslint.org/docs/rules/no-inner-declarations"
  30         },
  31
  32         schema: [
  33             {
  34                 enum: ["functions", "both"]
  35             }
  36         ],
  37
  38         messages: {
  39             moveDeclToRoot: "Move {{type}} declaration to {{body}} root."
  40         }
  41     },
  42
  43     create(context) {
  44
  45         /**
  46          * Ensure that a given node is at a program or function body's root.
  47          * @param {ASTNode} node Declaration node to check.
  48          * @returns {void}
  49          */
  50         function check(node) {
  51             const parent = node.parent;
  52
  53             if (
  54                 parent.type === "BlockStatement" && validBlockStatementParent.has(parent.parent.type)
  55             ) {
  56                 return;
  57             }
  58
  59             if (validParent.has(parent.type)) {
  60                 return;
  61             }
  62
  63             const upperFunction = astUtils.getUpperFunction(parent);
  64
  65             context.report({
  66                 node,
  67                 messageId: "moveDeclToRoot",
  68                 data: {
  69                     type: (node.type === "FunctionDeclaration" ? "function" : "variable"),
  70                     body: (upperFunction === null ? "program" : "function body")
  71                 }
  72             });
  73         }
  74
  75
  76         return {
  77
  78             FunctionDeclaration: check,
  79             VariableDeclaration(node) {
  80                 if (context.options[0] === "both" && node.kind === "var") {
  81                     check(node);
  82                 }
  83             }
  84
  85         };
  86
  87     }
  88 };