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Template Literal with infer does not handle surrogate pairs

microsoft/typescript#41149·111137·Go·2147 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 the latest published version. It may have already been fixed. For npm: `typescript@next` This is also the 'Nightly' version in the playground: http://www.typescriptlang.org/play/?ts=Nightly --> **TypeScript Version:** 4.1.0-dev.20201015 <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** template literal, surrogate pair, infer **Code** ```ts type Head<StrT extends string> = StrT extends `${infer HeadT}${string}` ? HeadT : never; type Tail<StrT extends string> = StrT extends `${string}${infer TailT}` ? TailT : never; type TestHead = Head<"𡁻"> type TestTail = Tail<"𡁻"> ``` **Expected behavior:** Should handle surrogate pairs properly **Actual behavior:** ![image](https://user-images.githubusercontent.com/5655961/96346365-6a8a6f80-1069-11eb-8622-a91f842c3fb0.png) ![image](https://user-images.githubusercontent.com/5655961/96346433-d4a31480-1069-11eb-89ee-b7299a8138ec.png) **Playground Link:** [Playground](https://www.typescriptlang.org/play?ts=4.1.0-dev.20201015#code/FAFwngDgpgBAElAhgEwDwGUQCcAqMoAeIUAdsgM4znYCWJA5gHwwC8Mmu+RpFMABgBIA3nQBmULPCTIcAX2HUsderL4wA-FJR4AXDBJQAbhIDcwUJFg5ENADYZseQsTKVFy5mw5Pur-gtoGeREScUlrOzk1TQjbXX0jU3NwaBgcKGoEFFYtNAAiQBENwG8dvMYLVPTqWJzY1EKSxiA) **Related Issues:** Searched for "template literal surrogate pair" and didn't find anything
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