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keyof T should never print as a union of strings
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<!-- 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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