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noInvalidBuiltinInstantiation

Diagnostic Category: lint/correctness/noInvalidBuiltinInstantiation

Since: v1.7.2

Sources:

Ensure that builtins are correctly instantiated.

The following builtins require new to be instantiate:

  • ArrayBuffer
  • BigInt64Array
  • BigUint64Array
  • DataView
  • FinalizationRegistry
  • Float32Array
  • Float64Array
  • Int16Array
  • Int32Array
  • Int8Array
  • Map
  • Promise
  • Proxy
  • Set
  • SharedArrayBuffer
  • Uint16Array
  • Uint32Array
  • Uint8Array
  • Uint8ClampedArray
  • WeakMap
  • WeakRef
  • WeakSet

Conversely, the following builtins cannot be instaiated with new:

  • BigInt
  • Symbol

Examples

Section titled Examples

Invalid

Section titled Invalid
const text = new BigInt(1);
code-block.js:1:14 lint/correctness/noInvalidBuiltinInstantiation  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Use BigInt() instead of new BigInt().
  
  > 1 │ const text = new BigInt(1);
      │              ^^^^^^^^^^^^^
    2 │ 
  
  ℹ Unsafe fix: Remove new keyword.
  
    1 │ const·text·=·new·BigInt(1);
      │              ----          
const map = Map([
  ['foo', 'bar']
]);
code-block.js:1:13 lint/correctness/noInvalidBuiltinInstantiation  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Use new Map() instead of Map().
  
  > 1 │ const map = Map([
      │             ^^^^^
  > 2 │   [‘foo’, ‘bar’]
  > 3 │ ]);
      │ ^^
    4 │ 
  
  ℹ Unsafe fix: Add new keyword.
  
    1 │ const·map·=·new·Map([
      │             ++++

Valid

Section titled Valid
const text = BigInt(1);
const map = new Map([
 ['foo', 'bar']
]);
Section titled Related links