Verify calls of super()
in constructors (constructor-super)
The "extends": "eslint:recommended"
property in a configuration file enables this rule.
Constructors of derived classes must call super()
. Constructors of non derived classes must not call super()
. If this is not observed, the javascript engine will raise a runtime error.
This rule checks whether or not there is a valid super()
call.
Rule Details
This rule is aimed to flag invalid/missing super()
calls.
Examples of incorrect code for this rule:
/*eslint constructor-super: "error"*/
/*eslint-env es6*/
class A {
constructor() {
super(); // This is a SyntaxError.
}
}
class A extends B {
constructor() { } // Would throw a ReferenceError.
}
// Classes which inherits from a non constructor are always problems.
class A extends null {
constructor() {
super(); // Would throw a TypeError.
}
}
class A extends null {
constructor() { } // Would throw a ReferenceError.
}
Examples of correct code for this rule:
/*eslint constructor-super: "error"*/
/*eslint-env es6*/
class A {
constructor() { }
}
class A extends B {
constructor() {
super();
}
}
When Not To Use It
If you don't want to be notified about invalid/missing super()
callings in constructors, you can safely disable this rule.
Version
This rule was introduced in ESLint 0.24.0.