.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         messages: {
  31             expectVarOnNewline: "Expected variable declaration to be on a new line."
  32         }
  33     },
  34
  35     create(context) {
  36
  37         const always = context.options[0] === "always";
  38
  39         //--------------------------------------------------------------------------
  40         // Helpers
  41         //--------------------------------------------------------------------------
  42
  43
  44         /**
  45          * Determine if provided keyword is a variant of for specifiers
  46          * @private
  47          * @param {string} keyword keyword to test
  48          * @returns {boolean} True if `keyword` is a variant of for specifier
  49          */
  50         function isForTypeSpecifier(keyword) {
  51             return keyword === "ForStatement" || keyword === "ForInStatement" || keyword === "ForOfStatement";
  52         }
  53
  54         /**
  55          * Checks newlines around variable declarations.
  56          * @private
  57          * @param {ASTNode} node `VariableDeclaration` node to test
  58          * @returns {void}
  59          */
  60         function checkForNewLine(node) {
  61             if (isForTypeSpecifier(node.parent.type)) {
  62                 return;
  63             }
  64
  65             const declarations = node.declarations;
  66             let prev;
  67
  68             declarations.forEach(current => {
  69                 if (prev && prev.loc.end.line === current.loc.start.line) {
  70                     if (always || prev.init || current.init) {
  71                         context.report({
  72                             node,
  73                             messageId: "expectVarOnNewline",
  74                             loc: current.loc,
  75                             fix: fixer => fixer.insertTextBefore(current, "\n")
  76                         });
  77                     }
  78                 }
  79                 prev = current;
  80             });
  81         }
  82
  83         //--------------------------------------------------------------------------
  84         // Public
  85         //--------------------------------------------------------------------------
  86
  87         return {
  88             VariableDeclaration: checkForNewLine
  89         };
  90
  91     }
  92 };