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keyof T should never print as a union of strings

microsoft/typescript#33254·111137·Go·2449 天未动·4 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:** 3.6.2 <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** extends keyof generic **Code** ```ts export const bindEvent = <Node extends HTMLElement | HTMLDocument, K extends keyof HTMLElementEventMap>( node: Node, type: K, callback: (event: HTMLElementEventMap[K]) => unknown, ) => { node.addEventListener(type, callback as EventListener); return () => { node.removeEventListener(type, callback as EventListener); }; }; tsc ``` **Expected behavior:** The generic `K` to still be extends keyof, instead of spreading the type out. **Actual behavior:** types generated: ```ts export declare const bindEvent: <Node_1 extends HTMLElement | HTMLDocument, K extends "fullscreenchange" | "fullscreenerror" | "abort" | "animationcancel" | "animationend" | "animationiteration" | "animationstart" | "auxclick" | "blur" | "cancel" | "canplay" | "canplaythrough" | "change" | "click" | "close" | "contextmenu" | "cuechange" | "dblclick" | "drag" | "dragend" | "dragenter" | "dragexit" | "dragleave" | "dragover" | "dragstart" | "drop" | "durationchange" | "emptied" | "ended" | "error" | "focus" | "focusin" | "focusout" | "gotpointercapture" | "input" | "invalid" | "keydown" | "keypress" | "keyup" | "load" | "loadeddata" | "loadedmetadata" | "loadend" | "loadstart" | "lostpointercapture" | "…
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