71 lines
1.3 KiB
JavaScript
71 lines
1.3 KiB
JavaScript
/* @flow */
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class A {}
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class B extends A {}
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class C extends B {}
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declare var a: A;
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declare var b: B;
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declare var c: C;
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class Base {
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x: B;
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+pos: B;
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-neg: B;
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get get(): B { return this.x };
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set set(value: B): void { this.x = value };
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get getset(): B { return this.x };
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set getset(value: B): void { this.x = value };
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}
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(class extends Base {
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// error: getter incompatible with read/write property
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get x(): B { return b }
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});
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(class extends Base {
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// error: setter incompatible with read/write property
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set x(value: B): void {}
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});
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(class extends Base {
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// ok: get/set co/contra with read/write property, resp.
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get x(): C { return c }
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set x(value: A): void {}
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});
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(class extends Base {
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// error: setter incompatible with read-only property
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set pos(value: B): void {}
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});
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(class extends Base {
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// ok: getter covariant with read-only property
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get pos(): C { return c }
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});
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(class extends Base {
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// error: getter incompatible with write-only property
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get neg(): B { return b }
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});
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(class extends Base {
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// ok: setter contravariant with write-only property
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set neg(value: A): void {}
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});
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(class extends Base {
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// ok: read/write covariant with getter
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get: C;
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});
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(class extends Base {
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// ok: read/write contravariant with setter
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set: A;
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});
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(class extends Base {
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// ok: read/write invariant with get/set
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getset: B;
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});
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