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我已经看到了关于字符串数组而不是实际字符串提到的这个错误.我有一个带有该行的TypeScript文件

if (!bus.lineInfo.PublishedLineName.includes(input)) {

这给了我一个错误

TS2339: Property 'includes' does not exist on type 'string'.

bus是一个实现bus接口的变量:

interface bus {
    "lineInfo": {
        "PublishedLineName": string,
        "DestinationName": string, // The headsign of the bus
        "Color": string,
        "TextColor": boolean | string // false if this is "FFFFFF", otherwise it's the color
    },
    "warnings": boolean | busWarnings
    "marker"?: google.maps.Marker,
    "result"?: JQuery // The search result that appears in the sidebar
}

lineInfo.PublishedLineName声明为a string,并且String.prototype.includes() 是根据MDN的函数,那么为什么TypeScript编译器会抱怨缺少的属性/方法？