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chained generic mixins fail

microsoft/typescript#28594·111137·Go·2805 天未动·2 条评论·上游最近活跃 ·池内状态:可认领
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<!-- 🚨 STOP 🚨 𝗦𝗧𝗢𝗣 🚨 𝑺𝑻𝑶𝑷 🚨 Half of all issues filed here are duplicates, answered in the FAQ, or not appropriate for the bug tracker. Even if you think you've found a *bug*, please read the FAQ first, especially the Common "Bugs" That Aren't Bugs section! Please help us by doing the following steps before logging an issue: * Search: https://github.com/Microsoft/TypeScript/search?type=Issues * Read the FAQ: https://github.com/Microsoft/TypeScript/wiki/FAQ Please fill in the *entire* template below. --> <!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. --> **TypeScript Version:** 3.2.0-dev.201xxxxx <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** chained generic mixins **Code** ```ts type Constructor<T> = new(...args: any[]) => T; interface XInterface { value: string; } function make<T extends Constructor<any>>(Base: T) { return class extends Base implements XInterface { value = "Hello!" } } // Great. Works. class _X1 extends make(Function) { hello() { this.value; }} type _T1 = Constructor<HTMLElement>; // Oops. But changing `make(Base)`, to `make(Base as _T1)` works perfectly, // which makes no sense. function make2<T extends _T1>(Base: T) { return class extends make(Base) { } } ``` **Expected behavior:** Compile. **Actual behavior:** Type '{ new (...args: any[]): make<T>.(Anonymous class); prototype: make<any>.(Anonymous class); } & T' is not a constructor function type.
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