noProto

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JavaScript (and super languages)

Summary

Rule available since: v2.3.8
Diagnostic Category: lint/nursery/noProto
This rule doesn’t have a fix.
The default severity of this rule is information.
Sources:
- Same as no-proto

How to configure

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{
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  "linter": {
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    "rules": {
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      "nursery": {
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        "noProto": "error"
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      }
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    }
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  }
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}

Description

Disallow the use of the __proto__ property.

The use of __proto__ for getting or setting the prototype of an object is deprecated. Use Object.getPrototypeOf() or Object.setPrototypeOf() instead.

Examples

Invalid

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obj.__proto__ = a;

code-block.js:1:1 lint/nursery/noProto ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Unexpected use of __proto__.
  
  > 1 │ obj.__proto__ = a;
      │ ^^^^^^^^^^^^^
    2 │ 
  
  ℹ The use of __proto__ for getting or setting the prototype of an object is deprecated.
  
  ℹ Use Object.getPrototypeOf() or Object.setPrototypeOf() instead.

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const b = obj.__proto__;

code-block.js:1:11 lint/nursery/noProto ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Unexpected use of __proto__.
  
  > 1 │ const b = obj.__proto__;
      │           ^^^^^^^^^^^^^
    2 │ 
  
  ℹ The use of __proto__ for getting or setting the prototype of an object is deprecated.
  
  ℹ Use Object.getPrototypeOf() or Object.setPrototypeOf() instead.

Valid

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const a = Object.getPrototypeOf(obj);

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Object.setPrototypeOf(obj, b);