127 lines
2.6 KiB
TypeScript
127 lines
2.6 KiB
TypeScript
// @strict: true
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// @declaration: true
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type T00<T> = { [P in keyof T]: T[P] };
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type T01<T> = { [P in keyof T]?: T[P] };
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type T02<T> = { [P in keyof T]+?: T[P] };
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type T03<T> = { [P in keyof T]-?: T[P] };
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type T04<T> = { readonly [P in keyof T]: T[P] };
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type T05<T> = { readonly [P in keyof T]?: T[P] };
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type T06<T> = { readonly [P in keyof T]+?: T[P] };
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type T07<T> = { readonly [P in keyof T]-?: T[P] };
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type T08<T> = { +readonly [P in keyof T]: T[P] };
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type T09<T> = { +readonly [P in keyof T]?: T[P] };
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type T10<T> = { +readonly [P in keyof T]+?: T[P] };
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type T11<T> = { +readonly [P in keyof T]-?: T[P] };
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type T12<T> = { -readonly [P in keyof T]: T[P] };
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type T13<T> = { -readonly [P in keyof T]?: T[P] };
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type T14<T> = { -readonly [P in keyof T]+?: T[P] };
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type T15<T> = { -readonly [P in keyof T]-?: T[P] };
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function f1<T>(x: Required<T>, y: T, z: Partial<T>) {
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x = x;
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x = y; // Error
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x = z; // Error
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y = x;
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y = y;
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y = z; // Error
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z = x;
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z = y;
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z = z;
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}
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type Denullified<T> = { [P in keyof T]-?: NonNullable<T[P]> };
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function f2<T>(w: Denullified<T>, x: Required<T>, y: T, z: Partial<T>) {
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w = w;
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w = x; // Error
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w = y; // Error
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w = z; // Error
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x = w;
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x = x;
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x = y; // Error
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x = z; // Error
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y = w;
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y = x;
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y = y;
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y = z; // Error
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z = w;
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z = x;
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z = y;
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z = z;
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}
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function f3<T>(w: Denullified<T>, x: Required<T>, y: T, z: Partial<T>) {
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w = {}; // Error
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x = {}; // Error
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y = {}; // Error
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z = {};
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}
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type Readwrite<T> = {
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-readonly [P in keyof T]: T[P];
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}
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function f10<T>(x: Readonly<T>, y: T, z: Readwrite<T>) {
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x = x;
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x = y;
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x = z;
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y = x;
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y = y;
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y = z;
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z = x;
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z = y;
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z = z;
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}
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type Foo = {
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a: number;
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b: number | undefined;
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c?: number;
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d?: number | undefined;
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}
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declare let x1: Foo;
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x1.a; // number
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x1.b; // number | undefined
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x1.c; // number | undefined
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x1.d; // number | undefined
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x1 = { a: 1 }; // Error
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x1 = { a: 1, b: 1 };
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x1 = { a: 1, b: 1, c: 1 };
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x1 = { a: 1, b: 1, c: 1, d: 1 };
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declare let x2: Required<Foo>;
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x1.a; // number
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x1.b; // number | undefined
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x1.c; // number
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x1.d; // number
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x2 = { a: 1 }; // Error
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x2 = { a: 1, b: 1 }; // Error
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x2 = { a: 1, b: 1, c: 1 }; // Error
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x2 = { a: 1, b: 1, c: 1, d: 1 };
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type Bar = {
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a: number;
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readonly b: number;
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}
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declare let x3: Bar;
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x3.a = 1;
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x3.b = 1; // Error
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declare let x4: Readonly<Bar>;
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x4.a = 1; // Error
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x4.b = 1; // Error
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declare let x5: Readwrite<Bar>;
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x5.a = 1;
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x5.b = 1;
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