[Typescript 5] override keyword
Overrides
A common mistake, that has historically been difficult for TypeScript to assist with is typos when overriding a class method
class Car {
honk() {
console.log("beep")
}
}
class Truck extends Car {
hoonk() { // OOPS!
console.log("BEEP")
}
}
const t = new Truck();
t.honk(); // "beep"In this case, it looks like the intent was to override the base class method, but because of the typo, we defined an entirely new method with a new name. TypeScript 5 includes an override keyword that makes this easier to spot
class Car {
honk() {
console.log("beep")
}
}
class Truck extends Car {
//This member cannot have an 'override' modifier because it is not declared in the base class 'Car'. Did you mean 'honk'?(4117)
override hoonk() { // OOPS!
console.log("BEEP")
}
}
const t = new Truck();
t.honk(); // "beep"
Sometimes, we might just forgot to add override in extended class, typescript has config option noImplicityOverride: true to help you to prevent this kind of error.
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