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Chris Tate
6115135d96
A constructor's new.target dispatch skipped generic class families, so a generic subclass instantiated only in a body lowered later answered with the base's name, and `new.target === Base` held for its instances. A family now has its own arm, tested by its instanceof interval, which holds every instantiation: `new.target.name` reads the family's name and comparisons with a program class are false. Under an instantiation, the generic subclasses of its family are candidates too. `new.target` as a value refuses generic subclasses, which have no common class value. `new.target.name` reads a class's own static `name` field, which replaces its name (a subclass has its own name); a static method `name` or a non-string field is refused.
6 lines
284 B
TypeScript
6 lines
284 B
TypeScript
// new.target as a class value where a subclass is generic: its
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// instantiations have no common class value.
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class A { readonly t: typeof A; constructor() { this.t = new.target; } }
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class B<T> extends A { readonly v: T | undefined = undefined; }
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console.log(new B<number>().t.name);
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