strictPropertyInitialization.errors.txt

tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(4,5): error TS2564: Property 'a' has no initializer and is not definitely assigned in the constructor.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(6,5): error TS2564: Property 'c' has no initializer and is not definitely assigned in the constructor.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(8,5): error TS2564: Property '#f' has no initializer and is not definitely assigned in the constructor.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(10,5): error TS2564: Property '#h' has no initializer and is not definitely assigned in the constructor.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(62,5): error TS2564: Property 'a' has no initializer and is not definitely assigned in the constructor.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(63,5): error TS2564: Property '#b' has no initializer and is not definitely assigned in the constructor.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(90,5): error TS2564: Property 'a' has no initializer and is not definitely assigned in the constructor.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(113,22): error TS2565: Property 'a' is used before being assigned.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(114,23): error TS2565: Property 'b' is used before being assigned.
tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts(115,23): error TS2565: Property '#d' is used before being assigned.


==== tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts (10 errors) ====
    // Properties with non-undefined types require initialization
    
    class C1 {
        a: number;  // Error
        ~
!!! error TS2564: Property 'a' has no initializer and is not definitely assigned in the constructor.
        b: number | undefined;
        c: number | null;  // Error
        ~
!!! error TS2564: Property 'c' has no initializer and is not definitely assigned in the constructor.
        d?: number;
        #f: number; //Error
        ~~
!!! error TS2564: Property '#f' has no initializer and is not definitely assigned in the constructor.
        #g: number | undefined;
        #h: number | null; //Error
        ~~
!!! error TS2564: Property '#h' has no initializer and is not definitely assigned in the constructor.
        #i?: number;
    }
    
    // No strict initialization checks in ambient contexts
    
    declare class C2 {
        a: number;
        b: number | undefined;
        c: number | null;
        d?: number;
        
        #f: number;
        #g: number | undefined;
        #h: number | null;
        #i?: number;
    }
    
    // No strict initialization checks for static members
    
    class C3 {
        static a: number;
        static b: number | undefined;
        static c: number | null;
        static d?: number;
    }
    
    // Initializer satisfies strict initialization check
    
    class C4 {
        a = 0;
        b: number = 0;
        c: string = "abc";
        #d = 0
        #e: number = 0
        #f: string= "abc"
    }
    
    // Assignment in constructor satisfies strict initialization check
    
    class C5 {
        a: number;
        #b: number;
        constructor() {
            this.a = 0;
            this.#b = 0;
        }
    }
    
    // All code paths must contain assignment
    
    class C6 {
        a: number;  // Error
        ~
!!! error TS2564: Property 'a' has no initializer and is not definitely assigned in the constructor.
        #b: number
        ~~
!!! error TS2564: Property '#b' has no initializer and is not definitely assigned in the constructor.
        constructor(cond: boolean) {
            if (cond) {
                return;
            }
            this.a = 0;
            this.#b = 0;
        }
    }
    
    class C7 {
        a: number;
        #b: number;
        constructor(cond: boolean) {
            if (cond) {
                this.a = 1;
                this.#b = 1;
                return;
            }
            this.a = 0;
            this.#b = 1;
        }
    }
    
    // Properties with string literal names aren't checked
    
    class C8 {
        a: number;  // Error
        ~
!!! error TS2564: Property 'a' has no initializer and is not definitely assigned in the constructor.
        "b": number;
        0: number;
    }
    
    // No strict initialization checks for abstract members
    
    abstract class C9 {
        abstract a: number;
        abstract b: number | undefined;
        abstract c: number | null;
        abstract d?: number;
    }
    
    // Properties with non-undefined types must be assigned before they can be accessed
    // within their constructor
    
    class C10 {
        a: number;
        b: number;
        c?: number;
        #d: number;
        constructor() {
            let x = this.a;  // Error
                         ~
!!! error TS2565: Property 'a' is used before being assigned.
            this.a = this.b;  // Error
                          ~
!!! error TS2565: Property 'b' is used before being assigned.
            this.b = this.#d //Error
                          ~~
!!! error TS2565: Property '#d' is used before being assigned.
            this.b = x;
            this.#d = x;
            let y = this.c;
        }
    }
    
    // Property is considered initialized by type any even though value could be undefined
    
    declare function someValue(): any;
    
    class C11 {
        a: number;
        #b: number;
        constructor() {
            this.a = someValue();
            this.#b = someValue();
        }
    }
    
    const a = 'a';
    const b = Symbol();
    
    class C12 {
        [a]: number;
        [b]: number;
        ['c']: number;
    
        constructor() {
            this[a] = 1;
            this[b] = 1;
            this['c'] = 1;
        }
    }
    
    enum E {
        A = "A",
        B = "B"
    }
    class C13 {
        [E.A]: number;
        constructor() {
            this[E.A] = 1;
        }
    }