File: doubleMixinConditionalTypeBaseClassWorks.ts

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node-typescript 4.9.5%2Bds1-2
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type Constructor = new (...args: any[]) => {};

const Mixin1 = <C extends Constructor>(Base: C) => class extends Base { private _fooPrivate: {}; }

type FooConstructor = typeof Mixin1 extends (a: Constructor) => infer Cls ? Cls : never;
const Mixin2 = <C extends FooConstructor>(Base: C) => class extends Base {};

class C extends Mixin2(Mixin1(Object)) {}