noObjectConstructor (JavaScript)

Language JavaScript (and super languages)

Summary

Rule available since: v2.6.0
Diagnostic Category: lint/nursery/noObjectConstructor
This rule has an unsafe fix.
The default severity of this rule is information.
Sources:
- Same as no-object-constructor
- Inspired from no-new-object

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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        "noObjectConstructor": "error"
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      }
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    }
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  }
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}

Description

Disallow calling Object without arguments to create an empty object.

Object() and new Object() without arguments both create an empty object, the same as {}. Writing {} is shorter and clearer, and it always creates a plain object, even if other code replaces the global Object.

Calls with an argument, such as Object(value), are allowed because they convert value to an object.

Examples

Invalid

1
const obj = Object();

code-block.js:1:13 lint/nursery/noObjectConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Calling Object without arguments creates an empty object.
  
  > 1 │ const obj = Object();
      │             ^^^^^^^^
    2 │ 
  
  ℹ Writing {} is shorter, and it always creates a plain object, even if other code replaces the global Object.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.
  
  ℹ Unsafe fix: Use an object literal.
  
    1   │ - const·obj·=·Object();
      1 │ + const·obj·=·{};
    2 2 │

1
const obj = new Object();

code-block.js:1:13 lint/nursery/noObjectConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Calling Object without arguments creates an empty object.
  
  > 1 │ const obj = new Object();
      │             ^^^^^^^^^^^^
    2 │ 
  
  ℹ Writing {} is shorter, and it always creates a plain object, even if other code replaces the global Object.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.
  
  ℹ Unsafe fix: Use an object literal.
  
    1   │ - const·obj·=·new·Object();
      1 │ + const·obj·=·{};
    2 2 │

1
const obj = new Object;

code-block.js:1:13 lint/nursery/noObjectConstructor  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Calling Object without arguments creates an empty object.
  
  > 1 │ const obj = new Object;
      │             ^^^^^^^^^^
    2 │ 
  
  ℹ Writing {} is shorter, and it always creates a plain object, even if other code replaces the global Object.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.
  
  ℹ Unsafe fix: Use an object literal.
  
    1   │ - const·obj·=·new·Object;
      1 │ + const·obj·=·{};
    2 2 │

Valid

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const obj = {};
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const wrapped = Object(value);
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const alsoWrapped = new Object(value);
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// Here, `Object` is a parameter, not the built-in `Object`.
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const createObject = (Object) => new Object();