在打字稿

Question

与定义的参数和属性的功能

我有一个类似如下的功能：

var myFunction = function (config) { 
    var example = this.property; // just illustrating that we use `this` 
} 
myFunction.__reference = 'foobar'; 

现在我想要把它写在严格打字稿：

interface ExternalScope { 
    property: string; 
} 

interface ConfigObject { 
    name: string, 
    count: number 
} 

interface MyFunction { 
    (XHRLoader: this, cfg: ConfigObject): any; 
    __reference: string; 
} 

var myFunction = function (this: ExternalScope, config: ConfigObject): any { 
    var example = this.property; 
} 
myFunction.__reference = 'foobar'; 

使用上面的代码，我得到以下TypeScipt错误：

Property '__reference' does not exist on type '(this: ExternalScope: config: ConfigObject) => any

我tsconfig.json相关部分：

"compilerOptions": { 
    "noEmitOnError": true, 
    "noImplicitAny": true, 
    "noImplicitReturns": true, 
    "noImplicitThis": true, 
    "strictNullChecks": true, 
    "noFallthroughCasesInSwitch": true, 
    "moduleResolution": "node", 
    "outDir": "./build", 
    "allowJs": false, 
    "target": "es5" 
}, 

Answer 1

这或许能有所帮助：

interface ExternalScope { 
    property: string; 
} 

interface ConfigObject { 
    name?: string, 
    count?: number 
} 

interface MyFunction { 
    (XHRLoader: this, cfg: ConfigObject): any; 
    __reference?: string; 
} 

var myFunction: MyFunction = function (this: ExternalScope, config: ConfigObject): any { 
    var example = this.property; 
} 

myFunction.__reference = 'foobar'; 

即使myFunction: myFunction创建你需要给它分配更多的错误。

当你根本

var myFunction = function (this: ExternalScope, config: ConfigObject): any { 
    var example = this.property; 
} 

打字稿试图推断myFunction变量的类型，因为它无法看到分配的功能的任何__reference性质，推断出的类型不包含它的。 希望它有帮助:)