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33 lines
770 B
TypeScript
33 lines
770 B
TypeScript
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// @target: es2019
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type Types = 'boolean' | 'unknown' | 'string';
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type Properties<T extends { [key: string]: Types }> = {
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readonly [key in keyof T]: T[key] extends 'boolean' ? boolean : T[key] extends 'string' ? string : unknown
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}
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type AnyCtor<P extends object> = new (...a: any[]) => P
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declare function classWithProperties<T extends { [key: string]: Types }, P extends object>(properties: T, klass: AnyCtor<P>): {
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new(): P & Properties<T>;
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prototype: P & Properties<T>
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};
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const Base = classWithProperties({
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get x() { return 'boolean' as const },
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y: 'string',
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}, class Base {
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});
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class MyClass extends Base {
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get x() {
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return false;
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}
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get y() {
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return 'hi'
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}
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}
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const mine = new MyClass();
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const value = mine.x;
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