1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/**
* @fileoverview Rule to flag when re-assigning native objects
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow reassigning native objects",
category: "Best Practices",
recommended: false
},
schema: [
{
type: "object",
properties: {
exceptions: {
type: "array",
items: {type: "string"},
uniqueItems: true
}
},
additionalProperties: false
}
]
},
create: function(context) {
var config = context.options[0];
var exceptions = (config && config.exceptions) || [];
/**
* Reports write references.
* @param {Reference} reference - A reference to check.
* @param {int} index - The index of the reference in the references.
* @param {Reference[]} references - The array that the reference belongs to.
* @returns {void}
*/
function checkReference(reference, index, references) {
var identifier = reference.identifier;
if (reference.init === false &&
reference.isWrite() &&
// Destructuring assignments can have multiple default value,
// so possibly there are multiple writeable references for the same identifier.
(index === 0 || references[index - 1].identifier !== identifier)
) {
context.report({
node: identifier,
message: "{{name}} is a read-only native object.",
data: identifier
});
}
}
/**
* Reports write references if a given variable is readonly builtin.
* @param {Variable} variable - A variable to check.
* @returns {void}
*/
function checkVariable(variable) {
if (variable.writeable === false && exceptions.indexOf(variable.name) === -1) {
variable.references.forEach(checkReference);
}
}
return {
Program: function() {
var globalScope = context.getScope();
globalScope.variables.forEach(checkVariable);
}
};
}
};
|
