Javascript 返回自身的复杂函数的类型脚本类型声明
我有以下javascript函数,它返回一个包含对象参数中给出的附加方法的函数。Javascript 返回自身的复杂函数的类型脚本类型声明,javascript,typescript,types,Javascript,Typescript,Types,我有以下javascript函数,它返回一个包含对象参数中给出的附加方法的函数。 我认为代码比解释更容易理解: var scopeFunction = (object) => { // create main function if it doesn't exist if (!object.main) object.main = function(){ alert("No main function for this scopeFunction"); }; //
我认为代码比解释更容易理解:
var scopeFunction = (object) => {
// create main function if it doesn't exist
if (!object.main) object.main = function(){
alert("No main function for this scopeFunction");
};
// add all object keys to the main function that will be return
_.each(object, function(d,i){ object.main[i] = d; });
// return main function
return object.main;
};
我想在typescript中正确地定义这段代码,这就是我所做的,但是atom typescript(这就是我测试它的地方)在我尝试访问返回函数对象的键时抛出错误。
这是我当前代码的外观:
// TYPES
namespace ScopeFunction {
export interface Function<Obj extends MakerObject, Key extends keyof Obj> {
(): Obj["main"];
[key: Key]: Obj[Key];
}
export interface MainFunction {
(...args:any[]) : any;
}
export interface MakerObject {
[key: string]: any;
main?: MainFunction;
}
export type Maker = <Obj extends MakerObject, Key extends keyof Obj>(object:Obj) => ScopeFunction.Function<Obj, Key>;
}
// FUNC
var scopeFunction:ScopeFunction.Maker = (object) => {
// create main function if it doesn't exist
if (!object.main) object.main = function(){
alert("No main function for this scopeFunction");
};
// add all object keys to the main function that will be return
_.each(object, function(d,i){ object.main[i] = d; });
// return main function
return object.main;
};
// TEST
var test = scopeFunction({
a: 1,
b: "3",
main: () => { console.log("testLog"); return 0; }
})
var test1 = test(); // WORKS OK
var test2 = test.main(); // ALERT: Property 'main' doesn't exist on type 'Function<{ a: number; b: string; main: () => number }, "main" | "a" | "b">'
var test3 = test.a; // ALERT: Property 'a' doesn't exist on type 'Function<{ a: number; b: string; main: () => number }, "main" | "a" | "b">'
//类型
命名空间作用域函数{
导出接口功能{
():Obj[“main”];
[键:键]:Obj[键];
}
导出接口主功能{
(…args:any[]):any;
}
导出接口MakerObject{
[键:字符串]:任意;
主?:主功能;
}
导出类型Maker=(对象:Obj)=>ScopeFunction.Function;
}
//FUNC
var scopeFunction:scopeFunction.Maker=(对象)=>{
//如果主函数不存在,则创建它
如果(!object.main)object.main=函数(){
警报(“此scopeFunction没有主功能”);
};
//将所有对象键添加到将返回的主函数
_.each(对象,函数(d,i){object.main[i]=d;});
//返回主函数
返回object.main;
};
//试验
var test=scopeFunction({
答:1,,
b:“3”,
main:()=>{console.log(“testLog”);返回0;}
})
var test1=test();//行吗
var test2=test.main();//警告:类型“Function number},“main”|“a”|“b”>上不存在属性“main”
var test3=test.a;//警告:类型“Function number},“main”|“a”|“b”>上不存在属性“a”
知道我的定义中的问题在哪里吗?您的代码有几个问题:
[key:key]:Obj[key]
无效,索引器参数必须是number
或string
(这些类型且仅这些类型有效)。您需要改用映射类型():Obj[“main”]
将不是与Obj[“main”]
相同类型的调用签名,它将是一个返回main
的任何属性的函数main
函数的类型过于泛型,它不会保留任何参数类型李>
实现您期望的解决方案可能是:
namespace ScopeFunction {
export type Function<Obj extends MakerObject<(...args: any[]) => any>> = Obj['main'] & {
[P in keyof Obj]: Obj[P];
}
export interface MakerObject<TMain extends (...args: any[]) => any> {
main?: TMain;
}
export type Maker = <TObj extends MakerObject<(...args: any[]) => any>>(object: TObj) => ScopeFunction.Function<TObj>;
}
// FUNC
var scopeFunction: ScopeFunction.Maker = (object) => {
// create main function if it doesn't exist
if (!object.main) object.main = function () {
alert("No main function for this scopeFunction");
};
// return main function
return Object.assign(object.main, object);
};
// TEST
var test = scopeFunction({
a: 1,
b: "3",
main: (param: number) => { console.log("testLog"); return param; }
})
var test1 = test(10);
var test2 = test.main(10);
var test3 = test.a;
命名空间作用域函数{
导出类型函数>=Obj['main']&{
[P in keyof Obj]:Obj[P];
}
导出接口MakerObject any>{
主?:TMain;
}
导出类型Maker=>(对象:TObj)=>ScopeFunction.Function;
}
//FUNC
var scopeFunction:scopeFunction.Maker=(对象)=>{
//如果主函数不存在,则创建它
如果(!object.main)object.main=函数(){
警报(“此scopeFunction没有主功能”);
};
//返回主函数
返回Object.assign(Object.main,Object);
};
//试验
var test=scopeFunction({
答:1,,
b:“3”,
main:(param:number)=>{console.log(“testLog”);返回param;}
})
var test1=测试(10);
var test2=test.main(10);
var test3=test.a;