Illegal invocation¶

ID: js/illegal-invocation
Kind: problem
Security severity: 
Severity: error
Precision: high
Tags:
   - quality
   - reliability
   - correctness
   - language-features
Query suites:
   - javascript-code-quality.qls
   - javascript-security-and-quality.qls

Click to see the query in the CodeQL repository

Class methods and arrow functions must not be invoked using new, and attempting to do so will result in a runtime error.

Conversely, constructors can only be invoked using new or super(...), and attempting to invoke them as a normal function will result in a runtime error.

Recommendation¶

Correct the invocation in question by adding or removing new as appropriate.

Example¶

In the following example, Point is a class, but on line 8 it is invoked without new. This will lead to a runtime error.

class Point {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }
}

let p = Point(23, 42);

Instead, new should be used:

class Point {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }
}

let p = new Point(23, 42);

References¶

Mozilla Developer Network: Constructors.
Mozilla Developer Network: Arrow functions.
Mozilla Developer Network: Method definitions.

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