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@putout/plugin-new
Advanced tools
🐊Putout plugin adds ability to remove useless and add missing operator 'new'
The
new
operator lets developers create an instance of a user-defined object type or of one of the built-in object types that has a constructor function.(c) MDN
🐊Putout plugin adds ability to add missing and remove useless operator new
.
npm i @putout/plugin-new
{
"rules": {
"new/remove-useless": "on",
"new/add-missing": "on"
}
}
Operator new
has no sense for Boolean
, String
, Number
, Object
, RegExp
, Math
, Reflect
, Error
, TypeError
:
Thus the function call
Error(…)
is equivalent to the object creation expressionnew Error(…)
with the same arguments.(c) https://262.ecma-international.org/12.0/#sec-error-constructor
And Symbol
, BigInt
cannot be used with new
, as it is primitive.
new Error('Something whent wrong');
new new Boolean()();
Error('Something whent wrong');
Boolean();
The
Set
constructor lets you create Set objects that store unique values of any type, whether primitive values or object references.(c) MDN
Missing operator new
should be added since built-in objects:
Set
;WeakSet
;Map
;WeakMap
;Int8Array
;Uint8Array
;Uint8ClampedArray
;Int16Array
;Uint16Array
;Int32Array
;Uint32Array
;Float32Array
;Float64Array
;BigInt64Array
;BigUint64Array
;Produces TypeError
when called without new
:
Uncaught TypeError: Constructor Set requires 'new'
const map = Map();
const map = new Map();
Linter | Rule | Fix |
---|---|---|
🐊 Putout | remove-useless-new | ✅ |
⏣ ESLint | no-new-wrappers | ❌ |
⠀ | no-new-object | ❌ |
⠀ | no-array-constructor | ❌ |
⠀ | no-new-symbol | ❌ |
⠀ | no-new-native-constructor | ❌ |
MIT
FAQs
🐊Putout plugin adds ability to remove useless and add missing operator 'new'
The npm package @putout/plugin-new receives a total of 2,551 weekly downloads. As such, @putout/plugin-new popularity was classified as popular.
We found that @putout/plugin-new demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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