mirror of
https://git.proxmox.com/git/pve-eslint
synced 2025-10-05 14:57:14 +00:00
eb39fafa4f
includes a (minimal) working wrapper Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
92 lines
2.1 KiB
Markdown
92 lines
2.1 KiB
Markdown
# Disallow Reassignment of Native Objects (no-native-reassign)
|
|
|
|
This rule was **deprecated** in ESLint v3.3.0 and replaced by the [no-global-assign](no-global-assign.md) rule.
|
|
|
|
JavaScript environments contain a number of built-in global variables, such as `window` in browsers and `process` in Node.js. In almost all cases, you don't want to assign a value to these global variables as doing so could result in losing access to important functionality. For example, you probably don't want to do this in browser code:
|
|
|
|
```js
|
|
window = {};
|
|
```
|
|
|
|
While examples such as `window` are obvious, there are often hundreds of built-in global objects provided by JavaScript environments. It can be hard to know if you're assigning to a global variable or not.
|
|
|
|
## Rule Details
|
|
|
|
This rule disallows modifications to read-only global variables.
|
|
|
|
ESLint has the capability to configure global variables as read-only.
|
|
|
|
* [Specifying Environments](../user-guide/configuring#specifying-environments)
|
|
* [Specifying Globals](../user-guide/configuring#specifying-globals)
|
|
|
|
Examples of **incorrect** code for this rule:
|
|
|
|
```js
|
|
/*eslint no-native-reassign: "error"*/
|
|
|
|
Object = null
|
|
undefined = 1
|
|
```
|
|
|
|
```js
|
|
/*eslint no-native-reassign: "error"*/
|
|
/*eslint-env browser*/
|
|
|
|
window = {}
|
|
length = 1
|
|
top = 1
|
|
```
|
|
|
|
```js
|
|
/*eslint no-native-reassign: "error"*/
|
|
/*global a:readonly*/
|
|
|
|
a = 1
|
|
```
|
|
|
|
Examples of **correct** code for this rule:
|
|
|
|
```js
|
|
/*eslint no-native-reassign: "error"*/
|
|
|
|
a = 1
|
|
var b = 1
|
|
b = 2
|
|
```
|
|
|
|
```js
|
|
/*eslint no-native-reassign: "error"*/
|
|
/*eslint-env browser*/
|
|
|
|
onload = function() {}
|
|
```
|
|
|
|
```js
|
|
/*eslint no-native-reassign: "error"*/
|
|
/*global a:writable*/
|
|
|
|
a = 1
|
|
```
|
|
|
|
## Options
|
|
|
|
This rule accepts an `exceptions` option, which can be used to specify a list of builtins for which reassignments will be allowed:
|
|
|
|
```json
|
|
{
|
|
"rules": {
|
|
"no-native-reassign": ["error", {"exceptions": ["Object"]}]
|
|
}
|
|
}
|
|
```
|
|
|
|
## When Not To Use It
|
|
|
|
If you are trying to override one of the native objects.
|
|
|
|
## Related Rules
|
|
|
|
* [no-extend-native](no-extend-native.md)
|
|
* [no-redeclare](no-redeclare.md)
|
|
* [no-shadow](no-shadow.md)
|