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tests/cases/conformance/classes/propertyMemberDeclarations/derivedUninitializedPropertyDeclaration.ts(12,21): error TS1255: A definite assignment assertion '!' is not permitted in this context.
tests/cases/conformance/classes/propertyMemberDeclarations/derivedUninitializedPropertyDeclaration.ts(15,5): error TS1031: 'declare' modifier cannot appear on class elements of this kind.
tests/cases/conformance/classes/propertyMemberDeclarations/derivedUninitializedPropertyDeclaration.ts(15,17): error TS1183: An implementation cannot be declared in ambient contexts.
tests/cases/conformance/classes/propertyMemberDeclarations/derivedUninitializedPropertyDeclaration.ts(17,24): error TS1039: Initializers are not allowed in ambient contexts.
tests/cases/conformance/classes/propertyMemberDeclarations/derivedUninitializedPropertyDeclaration.ts(24,5): error TS2564: Property 'p' has no initializer and is not definitely assigned in the constructor.
tests/cases/conformance/classes/propertyMemberDeclarations/derivedUninitializedPropertyDeclaration.ts(27,5): error TS2564: Property 'p' has no initializer and is not definitely assigned in the constructor.
==== tests/cases/conformance/classes/propertyMemberDeclarations/derivedUninitializedPropertyDeclaration.ts (6 errors) ====
class A {
property = 'x';
m() { return 1 }
}
class B extends A {
property: any; // error
}
class BD extends A {
declare property: any; // ok because it's implicitly initialised
}
class BDBang extends A {
declare property!: any; // ! is not allowed, this is an ambient declaration
~
!!! error TS1255: A definite assignment assertion '!' is not permitted in this context.
}
class BOther extends A {
declare m() { return 2 } // not allowed on methods
~~~~~~~
!!! error TS1031: 'declare' modifier cannot appear on class elements of this kind.
~
!!! error TS1183: An implementation cannot be declared in ambient contexts.
declare nonce: any; // ok, even though it's not in the base
declare property = 'y' // initialiser not allowed with declare
~~~
!!! error TS1039: Initializers are not allowed in ambient contexts.
}
class U {
declare nonce: any; // ok, even though there's no base
}
class C {
p: string;
~
!!! error TS2564: Property 'p' has no initializer and is not definitely assigned in the constructor.
}
class D extends C {
p: 'hi'; // error
~
!!! error TS2564: Property 'p' has no initializer and is not definitely assigned in the constructor.
}
class DD extends C {
declare p: 'bye'; // ok
}
declare class E {
p1: string
p2: string
}
class F extends E {
p1!: 'z'
declare p2: 'alpha'
}
class G extends E {
p1: 'z'
constructor() {
super()
this.p1 = 'z'
}
}
abstract class H extends E {
abstract p1: 'a' | 'b' | 'c'
declare abstract p2: 'a' | 'b' | 'c'
}
interface I {
q: number
}
interface J extends I { }
class J {
r = 5
}
class K extends J {
q!: 1 | 2 | 3 // ok, extends a property from an interface
r!: 4 | 5 // error, from class
}
// #35327
class L {
a: any;
constructor(arg: any) {
this.a = arg;
}
}
class M extends L {
declare a: number;
constructor(arg: number) {
super(arg);
console.log(this.a); // should be OK, M.a is ambient
}
}
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