61 lines
1.2 KiB
TypeScript
61 lines
1.2 KiB
TypeScript
// @declaration: true
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type Constructor<T> = new(...args: any[]) => T;
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class Base {
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constructor(public x: number, public y: number) {}
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}
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class Derived extends Base {
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constructor(x: number, y: number, public z: number) {
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super(x, y);
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}
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}
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const Printable = <T extends Constructor<Base>>(superClass: T): Constructor<Printable> & { message: string } & T =>
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class extends superClass {
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static message = "hello";
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print() {
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const output = this.x + "," + this.y;
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}
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}
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function Tagged<T extends Constructor<{}>>(superClass: T): Constructor<Tagged> & T {
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class C extends superClass {
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_tag: string;
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constructor(...args: any[]) {
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super(...args);
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this._tag = "hello";
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}
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}
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return C;
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}
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const Thing1 = Tagged(Derived);
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const Thing2 = Tagged(Printable(Derived));
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Thing2.message;
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function f1() {
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const thing = new Thing1(1, 2, 3);
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thing.x;
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thing._tag;
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}
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function f2() {
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const thing = new Thing2(1, 2, 3);
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thing.x;
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thing._tag;
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thing.print();
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}
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class Thing3 extends Thing2 {
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constructor(tag: string) {
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super(10, 20, 30);
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this._tag = tag;
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}
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test() {
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this.print();
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}
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}
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