blocks|key|687205|text|使用unknown意味着分配的函数应该能够处理任何参数类型，而您使用的函数只能处理特定类型。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|687206|可以使用自定义映射类型将每个回调映射到适当的参数类型：|687207|type+Mapper+=+{
++[P+in+PushNotificationPayload+as+P['category']]?:+(payload:+P)+=>+void
}|code-block|syntax|javascript|687208|操场连接|687209|entityMap|0|LINK|mutability|MUTABLE|url|https://www.typescriptlang.org/play?ssl=22&ssc=31&pln=19&pc=29#code/C4TwDgpgBACgrgZwBYDkD2wCWAzTBjAQyzQDsYCQAbNAgEwDVNaI0AZTAa2gF4oBvAFBQohYBADmaAE4gAXFADkANyYsA%2BpU4QFAbiFQVzNGqbyEwKZhLi9AXz2hIsRKgw58RTKXJUaDVWgAwmgAtiEQJMBQvILCohLScoqG6nih4ZG6%2BinGplDmltZ6cekRwCa0ZhZWNgL2Ao7Q8MjoWLiiXmQU1HTBYWXsXNH8%2BvGSMvIKaf2RGlpZwjkVVYW1JTPleQU1dg7gTS6t7h3e3X4AsgRSXFjWw7EiRAkTiiFXNzVZ9Y3OLW7tnlOvl6pUiACUIGBKCB7qMnuMklNQeUpJDoV89A19r9XG0PMQusDaNF9AAfHFHAEEnw9fxGQYQMkU-74zo0vyMIx9DLAJnNXHHQGE2ncgZaPmHFknYV%2BUXgtEgCV-PHS9l0S7XCC3WpYpyXMCQKSw4QAbRgUCszJVQrVxIICFgJqm8MSCgAum6APzyAAUYDOdHkMAAlNEAHwGNBMOoCARpEjmKBvMAoAgqcRCgBCIEprNIgRdL31huNBgCammPN9fDLRgqUFsoe4EYewn0tgANKNkXMuNXa%2BomA2my39G3hJ3suXNH2oD6RyNhOOG137EA^0|2|7|0|0|0|0|4|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

Using <code>unknown</code> means the function assigned should be capable to handle any parameter type, and you are using functions that can only handle a specific type.
You could use a custom mapped type to map each callback to the appropriate parameter type:
<pre><code>type Mapper = {
 [P in PushNotificationPayload as P['category']]?: (payload: P) =&gt; void
}
</code></pre>
<a href="https://www.typescriptlang.org/play?ssl=22&amp;ssc=31&amp;pln=19&amp;pc=29#code/C4TwDgpgBACgrgZwBYDkD2wCWAzTBjAQyzQDsYCQAbNAgEwDVNaI0AZTAa2gF4oBvAFBQohYBADmaAE4gAXFADkANyYsA+pU4QFAbiFQVzNGqbyEwKZhLi9AXz2hIsRKgw58RTKXJUaDVWgAwmgAtiEQJMBQvILCohLScoqG6nih4ZG6+inGplDmltZ6cekRwCa0ZhZWNgL2Ao7Q8MjoWLiiXmQU1HTBYWXsXNH8+vGSMvIKaf2RGlpZwjkVVYW1JTPleQU1dg7gTS6t7h3e3X4AsgRSXFjWw7EiRAkTiiFXNzVZ9Y3OLW7tnlOvl6pUiACUIGBKCB7qMnuMklNQeUpJDoV89A19r9XG0PMQusDaNF9AAfHFHAEEnw9fxGQYQMkU-74zo0vyMIx9DLAJnNXHHQGE2ncgZaPmHFknYV+UXgtEgCV-PHS9l0S7XCC3WpYpyXMCQKSw4QAbRgUCszJVQrVxIICFgJqm8MSCgAum6APzyAAUYDOdHkMAAlNEAHwGNBMOoCARpEjmKBvMAoAgqcRCgBCIEprNIgRdL31huNBgCammPN9fDLRgqUFsoe4EYewn0tgANKNkXMuNXa+omA2my39G3hJ3suXNH2oD6RyNhOOG137EA" rel="nofollow noreferrer">Playground Link</a>

The goal is to declare a <code>Record</code> type definition for a mapper in order to restrict the keys and function values.
The arguments of those functions have different behaviors, thus are defined using a union type.
<code>PushNotificationPayloadVideoComment</code> is part of <code>PushNotificationPayload</code> union type, but the TS compiler detects that it's not assignable to its union
<a href="https://i.stack.imgur.com/x5LO7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/x5LO7.png" alt="enter image description here" /></a>
TypeScript version: 4.3.2
<a href="https://typescript-play.js.org/#code/C4TwDgpgBACgrgZwBYDkD2wCWAzTBjAQyzQDsYCQAbNAgEwDVNaI0AZTAa2gF4oBvAFBQohYBADmaAE4gAXFADkANyYsA+pU4QFAbiFQVzNGqbyEwKZhLi9AXz2hIsRKgw58RTKXJUaDVWgAwmgAtiEQJMBQvILCohLScoqG6nih4ZG6+inGplDmltZ6cekRwCa0ZhZWNgL2Ao7Q8MjoWLiiXmQU1HTBYWXsXNH8+vGSMvIKaf2RGlpZwjkVVYW1JTPleQU1dg7gTS6t7h3e3X4AsgRSXFjWw7EiRAkTiiFXNzVZ9Y3OLW7tnlOvl6pUiACUIGBKCB7qMnuMklNQeUpJDoV89A19r9XG0PMQusDaNF9AAfHFHAEEnw9fxGQYQMkU-74zo0vyMIx9DLAJnNXHHQGE2ncgZaPmHFknYV+UXgtEgCV-PHS9l0S7XCC3WpYpyXMCQKTDCFpKS0AA8+n5lNZQNpAG0pvDEgoALoAGn0AAowGc6PI4CQOCQ0AB3EgASmiAD4DGgmAJo3o0iRzFA3mAUAQVOIhQAhEA26WBZ0vfWG2GLAJqaY8+RevgGatMKC2eTWqVCtV0lhy4BR7ixh7CEjZzC5sQAFTQnJYDabRgqrYjxVbnvWPLmXHrjaWLbbzJVXb9tD7DIHQ-0I7HE4g09naHne+JthX+ls64X6k026gXovIzCNeOZChC2AAHR4HAUiopEAD84GjiBYhegoMBSGguCUNo7qAUBwgIHgqIRJM6GYZg2EKJ++G+lIBAhAg8jDvh+QQNheBiLQk4EAARvIACM1FAR+V7LquIn2EAA" rel="nofollow noreferrer">Click here for the full code snippet on TS Playground</a>

Record function argument as union type is not assignable to its union values

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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目标是声明映射程序的Record类型定义，以限制键和函数值。这些函数的参数具有不同的行为，因此使用联合类型定义。PushNotificationPayloadVideoComment是PushNotificationPayload联合类型的一部分，但是TS编译器检测到它不能分配给它的联合​​TypeScript版本: 4.3.2

问作为联合类型的记录函数参数不能分配给它的联合值。
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问作为联合类型的记录函数参数不能分配给它的联合值。EN