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[dotfiles/.git] / .config / coc / extensions / node_modules / coc-prettier / node_modules / eslint / lib / rules / guard-for-in.js
1 /**
2  * @fileoverview Rule to flag for-in loops without if statements inside
3  * @author Nicholas C. Zakas
4  */
5
6 "use strict";
7
8 //------------------------------------------------------------------------------
9 // Rule Definition
10 //------------------------------------------------------------------------------
11
12 module.exports = {
13     meta: {
14         type: "suggestion",
15
16         docs: {
17             description: "require `for-in` loops to include an `if` statement",
18             category: "Best Practices",
19             recommended: false,
20             url: "https://eslint.org/docs/rules/guard-for-in"
21         },
22
23         schema: [],
24         messages: {
25             wrap: "The body of a for-in should be wrapped in an if statement to filter unwanted properties from the prototype."
26         }
27     },
28
29     create(context) {
30
31         return {
32
33             ForInStatement(node) {
34                 const body = node.body;
35
36                 // empty statement
37                 if (body.type === "EmptyStatement") {
38                     return;
39                 }
40
41                 // if statement
42                 if (body.type === "IfStatement") {
43                     return;
44                 }
45
46                 // empty block
47                 if (body.type === "BlockStatement" && body.body.length === 0) {
48                     return;
49                 }
50
51                 // block with just if statement
52                 if (body.type === "BlockStatement" && body.body.length === 1 && body.body[0].type === "IfStatement") {
53                     return;
54                 }
55
56                 // block that starts with if statement
57                 if (body.type === "BlockStatement" && body.body.length >= 1 && body.body[0].type === "IfStatement") {
58                     const i = body.body[0];
59
60                     // ... whose consequent is a continue
61                     if (i.consequent.type === "ContinueStatement") {
62                         return;
63                     }
64
65                     // ... whose consequent is a block that contains only a continue
66                     if (i.consequent.type === "BlockStatement" && i.consequent.body.length === 1 && i.consequent.body[0].type === "ContinueStatement") {
67                         return;
68                     }
69                 }
70
71                 context.report({ node, messageId: "wrap" });
72             }
73         };
74
75     }
76 };