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Generic type inference failure in a union.

microsoft/typescript#29471·111145·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:** 3.3.0-dev.20190117 <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** generic type inference, union types **Code** ```ts function f1<A1, B1>(cb: (a: A1, b: B1) => void) { f2(cb); // I expect no errors } function f2<A2, B2>(cb: ((x: number, a: A2, b: B2) => void)| ((a: A2, b: B2) => void)) {} // If I swap the two types it compiles ``` **Expected behavior:** No errors. **Actual behavior:** ``` TS2345: Argument of type '(a: A1, b: B1) => void' is not assignable to parameter of type '((x: number, a: B1, b: B1) => void) | ((a: B1, b: B1) => void)'. Type '(a: A1, b: B1) => void' is not assignable to type '(x: number, a: B1, b: B1) => void'. Types of parameters 'a' and 'x' are incompatible. Type 'number' is not assignable to type 'A1'. ``` **Playground Link:** <!-- A link to a TypeScript Playground "Share" link which demonstrates this behavior --> http://www.typescriptlang.org/play/#src=function%20f1%3CA1%2C%20B1%3E(cb%3A%20(a%3A%20A1%2C%20b%3A%20B1)%20%3D%3E%20void)%20%7B%0D%0A%20%20f2(cb)%3B%0D%0A%7D%0D%0A%0D%0Afunction%20f2%3CA2%2C%20B2%3E(cb%3A%20((x%3A%20number%2C%20a%3A%20A2%2C%20b%3A%20B2)%20%3D%3E%20void)%7C%0D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20((a%3A%20A2%2C%20b%3A%20B2)%20%3D%3E%20void))%20%7B%7D **Rela…
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