89 lines
1.6 KiB
TypeScript
89 lines
1.6 KiB
TypeScript
interface Base {
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foo: string|number;
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optional?: number;
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}
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// Derived1 is assignable to, but not a subtype of, Base
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class Derived1 implements Base {
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foo: string;
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}
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// Derived2 is a subtype of Base that is not assignable to Derived1
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class Derived2 implements Base {
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foo: number;
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optional: number;
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}
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class Animal {
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move;
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}
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class Mammal extends Animal { milk; }
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class Giraffe extends Mammal { neck; }
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function fn1(x: Array<number>|Array<string>|boolean) {
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if(x instanceof Array) {
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// 1.5: y: Array<number>|Array<string>
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// Want: y: Array<number>|Array<string>
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let y = x;
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}
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}
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function fn2(x: Base) {
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if(x instanceof Derived1) {
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// 1.5: y: Base
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// Want: y: Derived1
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let y = x;
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}
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}
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function fn3(x: Base|Derived1) {
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if(x instanceof Derived2) {
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// 1.5: y: Derived2
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// Want: Derived2
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let y = x;
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}
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}
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function fn4(x: Base|Derived2) {
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if(x instanceof Derived1) {
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// 1.5: y: {}
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// Want: Derived1
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let y = x;
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}
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}
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function fn5(x: Derived1) {
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if(x instanceof Derived2) {
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// 1.5: y: Derived1
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// Want: ???
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let y = x;
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}
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}
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function fn6(x: Animal|Mammal) {
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if(x instanceof Giraffe) {
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// 1.5: y: Derived1
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// Want: ???
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let y = x;
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}
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}
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function fn7(x: Array<number>|Array<string>) {
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if(x instanceof Array) {
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// 1.5: y: Array<number>|Array<string>
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// Want: y: Array<number>|Array<string>
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let y = x;
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}
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}
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interface Alpha { a }
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interface Beta { b }
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interface Gamma { c }
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class ABC { a; b; c; }
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function fn8(x: Alpha|Beta|Gamma) {
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if(x instanceof ABC) {
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let y = x;
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}
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}
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