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Bug: Chained this-intersecting methods don't work from within class

microsoft/typescript#28159·111145·Go·2748 天未动·1 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:** 3.1.1-insiders.20180926 <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** this chain **Code** ```ts class Builder { private _class: undefined; withFoo<T>() { return this as this & { foo: T } } withBar<T>() { return this as this & { bar: T } } withFooBar<T>() { return this.withFoo<T>().withBar<T>(); } } let good = new Builder().withFoo<number>().withBar<number>(); let bad = new Builder().withFooBar<number>(); good = bad; ``` **Expected behavior:** `good` & `bad` should be identical **Actual behavior:** `bad` is missing `foo` **Playground Link:** http://www.typescriptlang.org/play/#src=class%20Builder%20%7B%0D%0A%20%20%20%20private%20_class%3A%20undefined%3B%0D%0A%20%20%20%20withFoo%3CT%3E()%20%7B%0D%0A%20%20%20%20%20%20%20%20return%20this%20as%20this%20%26%20%7B%20foo%3A%20T%20%7D%0D%0A%20%20%20%20%7D%0D%0A%20%20%20%20withBar%3CT%3E()%20%7B%0D%0A%20%20%20%20%20%20%20%20return%20this%20as%20this%20%26%20%7B%20bar%3A%20T%20%7D%0D%0A%20%20%20%20%7D%0D%0A%20%20%20%20withFooBar%3CT%3E()%20%7B%0D%0A%20%20%20%20%20%20%20%20return%20this.withFoo%3CT%3E().withBar%3CT%3E()%3B%0D%0A%20%20%20%20%7D%0D%0A%7D%0D%0A%0D%0Alet%20good%20%3D%20new%20Builder().withFoo%3Cnumber%3E().withBar%3Cnumber%3E()%3B%0D%0Alet%20bad%20%3D%20new%20Bu…
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