E0290: assignment-assertion fields cannot have default values
In TypeScript, !
after a field name indicates a definite assignment
assertion. It is a syntax error to initialize such a field:
class Banana {
skin!: BananaSkin | undefined = undefined;
peel() {
this.skin = undefined;
}
}
To fix this error, remove the !
:
class Banana {
skin: BananaSkin | undefined = undefined;
peel() {
this.skin = undefined;
}
}
Alternatively, remove the initializer:
class Banana {
skin!: BananaSkin | undefined;
peel() {
this.skin = undefined;
}
}
Introduced in quick-lint-js version 2.10.0.