blocks|key|4467080|text|在此类型定义中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4467081|interface+Details+{
++Name:+[{
++++First:+string;
++++Last:+string;
++}];
}|code-block|syntax|javascript|4467082|Name在编译时不是数组。它是一个只有一个元素的元组。Typescript中的元组可以有额外的元素，但它们不能缺少元素。作为一个1元组，Name本质上是一个必须至少有一个元素的数组。|offset|length|style|CODE|4467083|但是，在该值中：|4467084|const+config+=+{
++Name:+[{
++++First:+"ABC",
++++Last:+"DEF"
++},
++{
++++First:+"LMN",
++++Last:+"XYZ"
++}]
};|4467085|由于没有显式类型，因此此处的Name属性默认为数组类型。数组可以有任意数量的元素，包括零--这不适合1元组。这就是你的错误。|4467086|你的错误可以通过给编译器一个提示，你的文字实际上是一个元组来修复：|4467087|const+config:+Details+=+{+Name:+[{...},+{...}]+};|4467088|如果您确实需要能够接受一组名称，则必须进行一些强制转换，可能如下所示：|4467089|if+(names.length+>+0)+{
++const+config+=+{
++++Name:+names+as+Details['Name']
++};
++Configuration(config);
}|4467090|(如果可以确定元组只是编写类型的人的一个错误，则可以删除if检查。)|4467091|元组引用：https://www.typescriptlang.org/docs/handbook/basic-types.html|4467092|entityMap|0|LINK|mutability|MUTABLE|url|https://www.typescriptlang.org/docs/handbook/basic-types.html^0|0|0|0|4|1W|4|0|0|0|E|4|0|0|0|0|0|0|5|1P|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1E|8|@$I|1F|J|1G|K|L]|$I|1H|J|1I|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|1J|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|1K|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|1L|8|@$I|1M|J|1N|K|L]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1O|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|W|3|X|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1R|8|@]|9|@]|A|$E|F]]|$1|10|3|11|5|6|7|1S|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1T|8|@]|9|@$I|1U|J|1V|1|1W]]|A|$]]|$1|14|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]]]

In this type definition:

<pre><code>interface Details {
 Name: [{
 First: string;
 Last: string;
 }];
}
</code></pre>

<code>Name</code> is not an array at compile-time. It's a tuple with one element. Tuples in Typescript are allowed to have extra elements, but they can't have missing elements. As a 1-tuple, <code>Name</code> is essentially an array which must have at least one element.

However, in this value:

<pre><code>const config = {
 Name: [{
 First: "ABC",
 Last: "DEF"
 },
 {
 First: "LMN",
 Last: "XYZ"
 }]
};
</code></pre>

Since there is no explicit typing, the <code>Name</code> property here defaults to array type. Arrays can have any number of elements, including zero - which doesn't fit in a 1-tuple. Hence your error.

Your error can be fixed by giving the compiler a hint that your literal is actually a tuple:

<pre><code>const config: Details = { Name: [{...}, {...}] };
</code></pre>

If you do need to be able to take in an array of names, you'll have to do some casting, maybe something like this:

<pre><code>if (names.length &gt; 0) {
 const config = {
 Name: names as Details['Name']
 };
 Configuration(config);
}
</code></pre>

(You could remove the if check if you can determine that the tuple was simply a mistake by whoever wrote the typings.)

Tuples reference:
<a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" rel="noreferrer">https://www.typescriptlang.org/docs/handbook/basic-types.html</a>

blocks|key|2354568|text|我遇到了同样的问题，并通过将界面更改为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2354569|++++interface+Details+{
++++++++Name:+{
++++++++++++First:+string;
++++++++++++Last:+string;
++++++++}[];
++++}|code-block|syntax|javascript|2354570|我知道你可能不想改变界面，但希望这对处于这种情况下的任何人都有帮助。|2354571|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I came across the same issue and got around it by changing the interface to:

<pre><code> interface Details {
 Name: {
 First: string;
 Last: string;
 }[];
 }
</code></pre>

I know you may not want the interface changed but hope this helps for anyone that is in this situation.

blocks|key|4467132|text|将接口更新为以下应可解决此问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4467133|+interface+Details+{
++++++++Name:+Array<{
++++++++++++First:+string;
++++++++++++Last:+string;
++++++++}>;
++++}|code-block|syntax|javascript|4467134|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Updating the interface to following should fix the issue : 

<pre><code> interface Details {
 Name: Array&lt;{
 First: string;
 Last: string;
 }&gt;;
 }
</code></pre>

blocks|key|5882564|text|此错误可能来自于错误地键入数组(就像我刚才所做的那样)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5882565|myArray:[];+//Incorrect,+results+in+error+message+of+`Property+'0'+is+missing+in+type`

myArray:+Array<string>;+//Correct

myArray:+string[];+//Also+correct|code-block|syntax|javascript|5882566|原因是方括号表示Typescript中的元组，而不是数组。|5882567|The+Docs|offset|length|5882568|entityMap|0|LINK|mutability|MUTABLE|url|https://www.typescriptlang.org/docs/handbook/basic-types.html^0|0|0|0|0|8|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

This error can come from incorrectly typing an array (like I just did):
<pre><code>myArray:[]; //Incorrect, results in error message of `Property '0' is missing in type`

myArray: Array&lt;string&gt;; //Correct

myArray: string[]; //Also correct
</code></pre>
The reason is that brackets denote a tuple in Typescript, not an array.
<a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" rel="noreferrer">The Docs</a>

I have my interface like this 

<pre class="lang-js prettyprint-override"><code>export interface Details {
 Name: [{
 First: string;
 Last: string;
 }];
} 
</code></pre>

I have an observable config variable: 

<code>Configuration: KnockoutObservable&lt;Details&gt; = ko.observable&lt;Details&gt;();</code>

and I would like to assign it a value in the constructor as follows: 

<pre class="lang-js prettyprint-override"><code>config = {
 Name: [{
 First: "ABC",
 Last: "DEF"
 },
 {
 First: "LMN",
 Last: "XYZ"
 }]
};

this.Configuration(config);
</code></pre>

and I am getting an error: 

<pre><code>Types of property 'Name' is incompatible and property '0' is missing in type.
Type '{ First:string; Last:string; }[]' is not assignable to 
type '[{ First: string; Last:string; }]'
</code></pre>

I don't have control on changing the interface as it is being used elsewhere. What is the correct way to initialize this config variable ?

Thanks in advance.

TypeScript Error: Property '0' is missing in type

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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我的界面是这样的export interface Details { Name: [{ First: string; Last: string; }];} 我有一个可观察的配置变量：Configuration: KnockoutObservable<Details> = ko.observable<...

问TypeScript错误:类型中缺少属性“0”
EN

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