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=== tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts ===
// Properties with non-undefined types require initialization
class C1 {
>C1 : C1
a: number; // Error
>a : number
b: number | undefined;
>b : number | undefined
c: number | null; // Error
>c : number | null
>null : null
d?: number;
>d : number | undefined
}
// No strict initialization checks in ambient contexts
declare class C2 {
>C2 : C2
a: number;
>a : number
b: number | undefined;
>b : number | undefined
c: number | null;
>c : number | null
>null : null
d?: number;
>d : number | undefined
}
// No strict initialization checks for static members
class C3 {
>C3 : C3
static a: number;
>a : number
static b: number | undefined;
>b : number | undefined
static c: number | null;
>c : number | null
>null : null
static d?: number;
>d : number | undefined
}
// Initializer satisfies strict initialization check
class C4 {
>C4 : C4
a = 0;
>a : number
>0 : 0
b: number = 0;
>b : number
>0 : 0
c: string = "abc";
>c : string
>"abc" : "abc"
}
// Assignment in constructor satisfies strict initialization check
class C5 {
>C5 : C5
a: number;
>a : number
constructor() {
this.a = 0;
>this.a = 0 : 0
>this.a : number
>this : this
>a : number
>0 : 0
}
}
// All code paths must contain assignment
class C6 {
>C6 : C6
a: number; // Error
>a : number
constructor(cond: boolean) {
>cond : boolean
if (cond) {
>cond : boolean
return;
}
this.a = 0;
>this.a = 0 : 0
>this.a : number
>this : this
>a : number
>0 : 0
}
}
class C7 {
>C7 : C7
a: number;
>a : number
constructor(cond: boolean) {
>cond : boolean
if (cond) {
>cond : boolean
this.a = 1;
>this.a = 1 : 1
>this.a : number
>this : this
>a : number
>1 : 1
return;
}
this.a = 0;
>this.a = 0 : 0
>this.a : number
>this : this
>a : number
>0 : 0
}
}
// Properties with string literal names aren't checked
class C8 {
>C8 : C8
a: number; // Error
>a : number
"b": number;
>"b" : number
0: number;
>0 : number
}
// No strict initialization checks for abstract members
abstract class C9 {
>C9 : C9
abstract a: number;
>a : number
abstract b: number | undefined;
>b : number | undefined
abstract c: number | null;
>c : number | null
>null : null
abstract d?: number;
>d : number | undefined
}
// Properties with non-undefined types must be assigned before they can be accessed
// within their constructor
class C10 {
>C10 : C10
a: number;
>a : number
b: number;
>b : number
c?: number;
>c : number | undefined
constructor() {
let x = this.a; // Error
>x : number
>this.a : number
>this : this
>a : number
this.a = this.b; // Error
>this.a = this.b : number
>this.a : number
>this : this
>a : number
>this.b : number
>this : this
>b : number
this.b = x;
>this.b = x : number
>this.b : number
>this : this
>b : number
>x : number
let y = this.c;
>y : number | undefined
>this.c : number | undefined
>this : this
>c : number | undefined
}
}
|
