docs/src/rules/no-this-before-super.md
In the constructor of derived classes, if this/super are used before super() calls, it raises a reference error.
This rule checks this/super keywords in constructors, then reports those that are before super().
This rule is aimed to flag this/super keywords before super() callings.
Examples of incorrect code for this rule:
::: incorrect
/*eslint no-this-before-super: "error"*/
class A1 extends B {
constructor() {
this.a = 0;
super();
}
}
class A2 extends B {
constructor() {
this.foo();
super();
}
}
class A3 extends B {
constructor() {
super.foo();
super();
}
}
class A4 extends B {
constructor() {
super(this.foo());
}
}
:::
Examples of correct code for this rule:
::: correct
/*eslint no-this-before-super: "error"*/
class A1 {
constructor() {
this.a = 0; // OK, this class doesn't have an `extends` clause.
}
}
class A2 extends B {
constructor() {
super();
this.a = 0; // OK, this is after `super()`.
}
}
class A3 extends B {
foo() {
this.a = 0; // OK. this is not in a constructor.
}
}
:::
This rule has no options.
If you don't want to be notified about using this/super before super() in constructors, you can safely disable this rule.