.config/coc/extensions/node_modules/coc-prettier/node_modules/eslint/lib/rules/one-var-declaration-per-line.js

   1 /**
   2  * @fileoverview Rule to check multiple var declarations per line
   3  * @author Alberto Rodríguez
   4  */
   5 "use strict";
   6
   7 //------------------------------------------------------------------------------
   8 // Rule Definition
   9 //------------------------------------------------------------------------------
  10
  11 module.exports = {
  12     meta: {
  13         type: "suggestion",
  14
  15         docs: {
  16             description: "require or disallow newlines around variable declarations",
  17             category: "Stylistic Issues",
  18             recommended: false,
  19             url: "https://eslint.org/docs/rules/one-var-declaration-per-line"
  20         },
  21
  22         schema: [
  23             {
  24                 enum: ["always", "initializations"]
  25             }
  26         ],
  27
  28         fixable: "whitespace"
  29     },
  30
  31     create(context) {
  32
  33         const ERROR_MESSAGE = "Expected variable declaration to be on a new line.";
  34         const always = context.options[0] === "always";
  35
  36         //--------------------------------------------------------------------------
  37         // Helpers
  38         //--------------------------------------------------------------------------
  39
  40
  41         /**
  42          * Determine if provided keyword is a variant of for specifiers
  43          * @private
  44          * @param {string} keyword keyword to test
  45          * @returns {boolean} True if `keyword` is a variant of for specifier
  46          */
  47         function isForTypeSpecifier(keyword) {
  48             return keyword === "ForStatement" || keyword === "ForInStatement" || keyword === "ForOfStatement";
  49         }
  50
  51         /**
  52          * Checks newlines around variable declarations.
  53          * @private
  54          * @param {ASTNode} node `VariableDeclaration` node to test
  55          * @returns {void}
  56          */
  57         function checkForNewLine(node) {
  58             if (isForTypeSpecifier(node.parent.type)) {
  59                 return;
  60             }
  61
  62             const declarations = node.declarations;
  63             let prev;
  64
  65             declarations.forEach(current => {
  66                 if (prev && prev.loc.end.line === current.loc.start.line) {
  67                     if (always || prev.init || current.init) {
  68                         context.report({
  69                             node,
  70                             message: ERROR_MESSAGE,
  71                             loc: current.loc.start,
  72                             fix: fixer => fixer.insertTextBefore(current, "\n")
  73                         });
  74                     }
  75                 }
  76                 prev = current;
  77             });
  78         }
  79
  80         //--------------------------------------------------------------------------
  81         // Public
  82         //--------------------------------------------------------------------------
  83
  84         return {
  85             VariableDeclaration: checkForNewLine
  86         };
  87
  88     }
  89 };